"การลดจำนวนแรงงานต่างชาติ เป็นปัญหาใหญ่ที่เกิดใน ยุโรปมานานแล้ว จนในที่สุดต้องออกแบบเครื่องจักรอัตโนมัติมาทำงานแทน ในปัจจุบันโรคระบาดเป็นปัจจัยสำคัญที่ต้องนำมาใช้วิเคราะห์ในการลงทุนด้วย ซึ่งมีหลายประเด็นใน ศตวรรษที่ 21 วิชา Engineering Economy ในสมัยก่อนไม่ได้คำนึงถึงในโลกความจริง ทำให้นำวิชานี้ไปใช้ในโลกความจริงไม่ได้ผล"
A is a uniform series of equal payments at each compounding period; P is a present single sum of money at the time zero; F is a future sum of money at the end of period n. And i is the compound interest rate. i is the compound interest rate n is the period.
In order to compare different alternatives in an economic evaluation, they should have the same base (equivalent base). Compound interest is a method that can help applying the time value of money. For example, assume you have 100 dollars now and you put it in a bank for interest rate of 3% per year. After one year, the bank will pay you 100+100*0.03 =$103. Then, you will put the 103 dollars in the bank again for another year. One year later, you will have 103+103*0.03 =$106.09.
P: Present single sum of money. F: A future single sum of money at some designated future date. n: The number of periods in the project evaluation life (can be year, quarter or month). i: The discount rate (interest rate).
Example 1-1: Assume you put 20,000 dollars (principal) in a bank for the interest rate of 4%. How much money will the bank give you after 10 years? F=P(1+i)n =20,000*(1+0.04)10=20,000*1.48024=29604.8
P: Present single sum of money. F: A future single sum of money at some designated future date. n: The number of periods in the project evaluation life (can be year, quarter or month). i: The discount rate (interest rate).
Example 1-2: Assuming the discount rate of 10 %, present value of 100 dollars
which will be received in 5 years from now can be calculated as:
F = 100 dollars n = 5 i = 0.1 P = F[(1 + i)-n] = 100[(1 + 0.1)-5] = 62.1 You can see how time and discount rate can affect the value of money in the future. 62.1 dollars is the equivalent present sum that has the same value of 100 dollars in five years under the discount rate of 10%
%============== copy Formulas =============
%============== start of library ==========
%%====================================
%% Engineering Economy Formula
%%====================================
function v = npv (r, p, i)
if (nargin < 2 || nargin > 3)
print_usage ();
endif
if (! (isvector (p)))
error ("npv: p has to be a vector");
else
n = length (p);
p = reshape (p, 1, n);
endif
if (any (any (r <= -1)))
error ("npv: all interest rates must be > -1");
endif
if (isscalar (r))
d = 1 ./ (1 + r) .^ (0 : n);
elseif (isvector (r) && (length (r) == n))
d = [1, (1 ./ cumprod (reshape (1 + r, 1, n)))];
else
error ("npv: r must be a scalar or a vector of the same length as p");
endif
if (nargin == 3)
if (! isscalar (i))
error ("npv: I_0 must be a scalar");
endif
else
i = 0;
endif
p = [i, p];
v = sum (d .* p);
endfunction
function r = irr (p, i = 0)
## Check input
if (nargin != 1 && nargin != 2)
print_usage ();
elseif (! (isvector (p)))
error ("irr: p must be a vector");
elseif (! isscalar (i))
error ("irr: i must be a scalar");
endif
## Solve system
f = @(x) npv (x, p) - i;
r = fsolve (f, 0);
endfunction
function p = pmt (r, n, a, l, m)
if (nargin < 3 || nargin > 5)
print_usage ();
endif
if (! (isscalar (r) && r > -1))
error ("pmt: rate must be a scalar > -1");
elseif (! (isscalar (n) && n > 0))
error ("pmt: n must be a positive scalar");
elseif (! (isscalar (a) && a > 0))
error ("pmt: a must be a positive scalar");
endif
if (nargin == 5)
if (! ischar (m))
error ("pmt: `method' must be a string");
endif
elseif (nargin == 4)
if (ischar (l))
m = l;
l = 0;
else
m = "e";
endif
else
l = 0;
m = "e";
endif
p = r * (a - l * (1 + r)^(-n)) / (1 - (1 + r)^(-n));
if (strcmp (m, "b"))
p = p / (1 + r);
endif
endfunction
function v = pv (r, n, p, l, m)
if (nargin < 3 || nargin > 5)
print_usage ();
endif
if (! (isscalar (r) && r > -1))
error ("pv: r must be a scalar > -1");
elseif (! (isscalar (n) && n > 0))
error ("pv: n must be a positive scalar");
elseif (! isscalar (p))
error ("pv: p must be a scalar");
endif
if (r != 0)
v = p * (1 - (1 + r)^(-n)) / r;
else
v = p * n;
endif
if (nargin > 3)
if (nargin == 5)
if (! ischar (m))
error ("pv: `method' must be a string");
endif
elseif (ischar (l))
m = l;
l = 0;
else
m = "e";
endif
if (strcmp (m, "b"))
v = v * (1 + r);
endif
if (isscalar (l))
v = v + pvl (r, n, l);
else
error ("pv: l must be a scalar");
endif
endif
endfunction
function v = npv (r, p, i)
if (nargin < 2 || nargin > 3)
print_usage ();
endif
if (! (isvector (p)))
error ("npv: p has to be a vector");
else
n = length (p);
p = reshape (p, 1, n);
endif
if (any (any (r <= -1)))
error ("npv: all interest rates must be > -1");
endif
if (isscalar (r))
d = 1 ./ (1 + r) .^ (0 : n);
elseif (isvector (r) && (length (r) == n))
d = [1, (1 ./ cumprod (reshape (1 + r, 1, n)))];
else
error ("npv: r must be a scalar or a vector of the same length as p");
endif
if (nargin == 3)
if (! isscalar (i))
error ("npv: I_0 must be a scalar");
endif
else
i = 0;
endif
p = [i, p];
v = sum (d .* p);
endfunction
function v = fv (r, n, p, l, m)
if (nargin < 3 || nargin > 5)
print_usage ();
endif
if (! (isscalar (r) && r > -1))
error ("fv: r must be a scalar > -1");
elseif (! (isscalar (n) && n > 0))
error ("fv: n must be a positive scalar");
elseif (! isscalar (p))
error ("fv: p must be a scalar");
endif
if (r != 0)
v = p * ((1 + r)^n - 1) / r;
else
v = p * n;
endif
if (nargin > 3)
if (nargin == 5)
if (! ischar (m))
error ("fv: `method' must be a string");
endif
elseif ischar (l)
m = l;
l = 0;
else
m = "e";
endif
if strcmp (m, "b")
v = v * (1 + r);
endif
if isscalar (l)
v = v + fvl (r, n, l);
else
error ("fv: l must be a scalar");
endif
endif
endfunction
%%====================================
%% Engineering Economy Basic Formulas
%%====================================
%P/F
function p = f_p(i ,n)
p = ((1 + i)^n );
endfunction
%F/P
function f = p_f(i ,n)
f = ((1 + i)^-n );
endfunction
%F/A
function f = f_a(i ,n)
v = ((1 + i)^n );
f = (v - 1) / i;
endfunction
%A/F
function a = a_f(i ,n)
a = 1 / f_a(i ,n);
endfunction
%P/A
function v = p_a(i ,n)
v = ((1 + i)^n );
v = (v - 1) / i;
v = v / ((1 + i)^n );
endfunction
%A/P
function a = a_p(i ,n)
a = 1 / p_a(i ,n);
endfunction
%============== end of library ==========
%========================================
Week#1
%%====================================
%% Engineering Economy Basic Formulas
%%====================================
%P/F
function p = f_p(i ,n)
p = ((1 + i)^n );
endfunction
%F/P
function f = p_f(i ,n)
f = ((1 + i)^-n );
endfunction
%F/A
function f = f_a(i ,n)
v = ((1 + i)^n );
f = (v - 1) / i;
endfunction
%A/F
function a = a_f(i ,n)
a = 1 / f_a(i ,n);
endfunction
%P/A
function v = p_a(i ,n)
v = ((1 + i)^n );
v = (v - 1) / i;
v = v / ((1 + i)^n );
endfunction
%A/P
function a = a_p(i ,n)
a = 1 / p_a(i ,n);
endfunction
%============start of Examples===========
%=========Example#1======================
%%https://www.e-education.psu.edu/eme460/node/654
% A is a uniform series of equal payments at each compounding period;
% P is a present single sum of money at the time zero;
% F is a future sum of money at the end of period n. And i is the compound interest rate.
% i is the compound interest rate
% n is the period.
disp("=========Example 1-1=========")
%Assume you put 20,000 dollars (principal) in a bank for the interest rate of 4%.
%How much money will the bank give you after 10 years?
n = 10
i = 4/100
p = 20000
f = p * f_p(i ,n);
printf("F = %10.2f\n",f)
%disp("===================")
disp("=========Example 1-2=========")
% Assuming the discount rate of 10 %, present value of 100 dollars
% which will be received in 5 years from now can be calculated as:
n = 5
i = 10/100
f = 100
p = f * p_f(i ,n);
printf("P = %10.2f\n",p)
%disp("===================")
disp("=========Example 1-2-1=========")
% Assuming the interest rate of 10 %, present value of 10,000 dollars
% How many years from now it will be double in value:
i = 10/100
p = 10000
for n = 1:10
f = p * f_p(i ,n);
printf("n= %d : F = %10.2f\n",n,f)
if f > (2*p)
break
endif
endfor
%disp("===================")
disp("=========Example 1-3=========")
n = 20
i = 6/100
a = 4000
f = a * f_a(i ,n);
printf("F = %10.2f\n",f)
%disp("===================")
disp("=========Example 1-4=========")
n = 20
i = 6/100
f = 200000
a = f * a_f(i ,n);
printf("A = %10.2f\n",a)
%disp("===================")
disp("=========Example 1-5=========")
n = 10
i = 12/100
a = 2000
p = a * p_a(i ,n);
printf("P = %10.2f\n",p)
%disp("===================")
disp("=========Example 1-6=========")
p = 25000
i =4/100
n = 5
A = p * a_p(i,n);
printf("A = %10.2f\n",A)
%disp("===================")
disp("=========Example 1-7=========")
i = 8/100
P = 1000 * p_f(i,1)+ 1500 * p_f(i,2)+ 1800 * p_f(i,3)+ 1200 * p_f(i,4)+ 2000 * p_f(i,5)
disp("===================")
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# load "C:\\QTOOLS\\API\\week4.rb"
#load others rb files
load "C:\\QTOOLS\\API\\week2.rb"
load "C:\\QTOOLS\\API\\week3.rb"
def test
p "week4"
end
def add_point
pt = Geom::Point3d.new(10.m,0,0) #create new point
model = Sketchup.active_model
model.entities.add_cpoint(pt) #add into model
end
def add_line
pt1 = Geom::Point3d.new(0,0,0)
pt2 = Geom::Point3d.new(10.m,20.m,4.m)
model = Sketchup.active_model
model.entities.add_line pt1,pt2
end
def add_face
pt1 = Geom::Point3d.new(0,0,0)
pt2 = Geom::Point3d.new(10.m,20.m,0)
pt3 = Geom::Point3d.new(0,20.m,0)
model = Sketchup.active_model
model.entities.add_face(pt1, pt2, pt3)
end
def add_room
pt1 = Geom::Point3d.new(0,0,0)
pt2 = Geom::Point3d.new(4.m,0,0)
pt3 = Geom::Point3d.new(4.m,5.m,0)
pt4 = Geom::Point3d.new(0,5.m,0)
model = Sketchup.active_model
face = model.entities.add_face(pt1, pt2, pt3, pt4)
face.pushpull 10.cm
end
def group_add_room
pt1 = Geom::Point3d.new(0,0,0)
pt2 = Geom::Point3d.new(4.m,0,0)
pt3 = Geom::Point3d.new(4.m,5.m,0)
pt4 = Geom::Point3d.new(0,5.m,0)
model = Sketchup.active_model
group = model.entities.add_group
face = group.entities.add_face(pt1, pt2, pt3, pt4)
face.pushpull 10.cm
end
def rotate1
model = Sketchup.active_model; selection = model.selection; entity = selection[0];
angle = 45.degrees #radians
vector = Geom::Vector3d.new(0,0,1) #Z axis
point = Geom::Point3d.new(0,0,0) #origin
tr_rotate = Geom::Transformation.rotation point, vector, angle
entity.transform!(tr_rotate)
end
def move1
model = Sketchup.active_model; selection = model.selection; entity = selection[0];
#tr_vector = Geom::Vector3d.new(10.m,2.m,0)
tr_vector = Geom::Point3d.new(4.m,0,0) - Geom::Point3d.new(0,0,0)
tr_move = Geom::Transformation.translation tr_vector
entity.transform!(tr_move)
end
def scale1
model = Sketchup.active_model; selection = model.selection; entity = selection[0];
xscale = 2
yscale = 2
zscale = 1
point = Geom::Point3d.new(1.m,0,0) #change ref. point
tr_scale = Geom::Transformation.scaling point, xscale, yscale, zscale
entity.transform!(tr_scale)
end
def grid1
arr_x = [3,4,5]
arr_y = [6,7]
point = Geom::Point3d.new(0,0,0)
ix = 0
iy = 0
arr_x.each{|dx|
puts dx;
p "======"
}#arr_x
end
def grid11
arr_x = [3,4,5]
arr_y = [6,7]
point = Geom::Point3d.new(0,0,0)
ix = 0
iy = 0
arr_x.each{|dx|
puts dx;
p "======"
arr_y.each{|dy|
puts dy;
p "*****"
}#arr_y
}#arr_x
end
def grid12
arr_x = [3,4,5]
arr_y = [6,7]
point = Geom::Point3d.new(0,0,0)
ix = 0
iy = 0
point_row = point #ref. point
model = Sketchup.active_model
arr_x.each{|dx|
puts dx;
p "======"
pt2 = point_row.offset Geom::Vector3d.new(dx.m,0,0)
model.entities.add_cpoint(pt2) #add cpoint
point_row = pt2 #change ref. point to pt2
} #arr_x
end
def grid13
arr_x = [0,3,4,5]
arr_y = [0,6,7]
point_ver = Geom::Point3d.new(10.m,20.m,0)
ix = 0
iy = 0
point_row = point_ver #ref. point
model = Sketchup.active_model
arr_y.each{|dy|
point_ver = point_ver.offset Geom::Vector3d.new(0,-dy.m,0)
point_row = point_ver #ref. point
arr_x.each{|dx|
puts dx;
p "======"
pt2 = point_row.offset Geom::Vector3d.new(dx.m,0,0)
model.entities.add_cpoint(pt2) #add cpoint
point_row = pt2 #change ref. point to pt2
}#arr_x
} #arr_y
end
def grid14
arr_x = [0,3,4,5]
arr_y = [0,6,7]
point_ver = Geom::Point3d.new(10.m,20.m,0)
ix = 0
iy = 0
point_row = point_ver #ref. point
model = Sketchup.active_model
#model.start_operation( "Make Grid" , true)
arr_y.each{|dy|
point_ver = point_ver.offset Geom::Vector3d.new(0,-dy.m,0)
point_row = point_ver #ref. point
arr_x.each{|dx|
puts dx;
p "======"
pt2 = point_row.offset Geom::Vector3d.new(dx.m,0,0)
make_column1(pt2) #add column
model.entities.add_cpoint(pt2) #add cpoint
point_row = pt2 #change ref. point to pt2
}#arr_x
} #arr_y
#model.commit_operation
end
def make_column1(pt) #parameters
#dimension of Column
dx = 0.4.m
dy = 0.3.m
dz = 3.m
#create points
#pt1 = pt
pt1 = pt.offset Geom::Vector3d.new((dx * -0.5) ,(dy * -0.5),0) #adjust center point of column
pt2 = pt1.offset Geom::Vector3d.new(dx,0,0)
pt3 = pt2.offset Geom::Vector3d.new(0,dy,0)
pt4 = pt1.offset Geom::Vector3d.new(0,dy,0)
#create object column
model = Sketchup.active_model
group = model.entities.add_group
face = group.entities.add_face(pt1, pt2, pt3, pt4)
face.pushpull -dz
#add layer
layer = model.layers.add "my_column"
#change layer of group
group.layer = layer
end
def count_group
model = Sketchup.active_model;
selection = model.selection;
arr = [];
selection.each{|entity| arr.push entity }
count = 0
arr.each{|entity|
if (entity.class == Sketchup::Group);
group = entity;
count = count + 1
end
}
p "group count =" + count.to_s
p ""
end
# load "C:\\QTOOLS\\API\\week3.rb" def test p "week3" end def make_column #dimension of Column dx = 0.4.m dy = 0.3.m dz = 3.m #create points pt1 = Geom::Point3d.new(0,0,0) pt2 = pt1.offset Geom::Vector3d.new(dx,0,0) pt3 = pt2.offset Geom::Vector3d.new(0,dy,0) pt4 = pt1.offset Geom::Vector3d.new(0,dy,0) #create object column model = Sketchup.active_model group = model.entities.add_group face = group.entities.add_face(pt1, pt2, pt3, pt4) face.pushpull -dz #add layer layer = model.layers.add "my_column" #change layer of group group.layer = layer end def make_beam #dimension of Column dx = 4.m dy = 0.2.m dz = 0.4.m angle = 0.degrees #rotation angle #create points pt1 = Geom::Point3d.new(0,0,0) pt2 = pt1.offset Geom::Vector3d.new(dx,0,0) pt3 = pt2.offset Geom::Vector3d.new(0,dy,0) pt4 = pt1.offset Geom::Vector3d.new(0,dy,0) #create object column model = Sketchup.active_model group = model.entities.add_group face = group.entities.add_face(pt1, pt2, pt3, pt4) face.pushpull dz tr_rotate = Geom::Transformation.rotation pt1, Geom::Vector3d.new(0,0,1), angle group.transform!(tr_rotate) #add layer layer = model.layers.add "my_beam" #change layer of group group.layer = layer end def move_object #parameters from user prompts = ["dx [m.]" , "dy [m.]" , "dz [m.]"]; defaults = ["1" , "1" , "1"]; input = UI.inputbox prompts, defaults, "Enter dx,dy,dz." #return as array #distance of be move dx = input[0].to_f.m dy = input[1].to_f.m dz = input[2].to_f.m model = Sketchup.active_model; selection = model.selection; entity = selection[0]; tr_vector = Geom::Vector3d.new(dx,dy,dz) tr_move = Geom::Transformation.translation tr_vector entity.transform!(tr_move) end
# load "C:\\QTOOLS\\API\\week1.rb" def count_object model = Sketchup.active_model; selection = model.selection; entity = selection[0]; if (entity.class == Sketchup::Edge); edge = entity; p edge end if (entity.class == Sketchup::Face); face = entity; p face end if (entity.class == Sketchup::Group); group = entity; p group end if (entity.class == Sketchup::ComponentInstance); component = entity; p component end endEnd of Week 1
%Example 1 t = 0:0.1:6.3; plot (t, cos(t), "-;cos(t);", t, sin(t*0.5), "-b;sin(t);"); print -dpng some_name.png; %Example 2 x=1:0.1:10; plot(x, sin(x)); print -dpng some_name.png; %Example 3 A = [3,12; 4,2;] C = [15; 6;] x = inv(A)*C %Example 4 Hydro static rho = 1000 %kg/cu.m. g = 9.81 %m/s2 h = 20 %m p = rho * g * h %N/sq.m
%*****Reaction at simple beam
printf("Student No.2\n")
printf("**************\n")
F1 = 150 %KN
L = 6 %m
L1 = 1 %m
L2 = L - L1
A = [1,1; L, 0;]
F = [F1; (L2*F1);]
R = inv(A)*F
printf("R1 = %6.3f\n",R(1))
printf("R2 = %6.3f\n",R(2))
Example 06
%****Cantiliver Beam
printf("Student No.1\n")
printf("**************\n")
F1 = 300 %KN
L = 2 %m
A = [1,0; 0, 1;]
F = [F1; (L*F1);]
R = inv(A)*F
printf("RY = %6.3f KN\n",R(1))
printf("MA = %6.3f KN.m\n",R(2))
Example 07
-->
%*****Reaction at simple beam F1 F2
printf("Student No.2\n")
printf("**************\n")
F1 = 100 %KN
F2 = 50 %KN
L = 6 %m
L1 = 1 %m
L2 = 1.2 %m
FT = F1 + F2 %total force
MT = (L1*F1) + ((L1+L2)*F2) %total moment
A = [1,1; 0, L;]
F = [FT; MT;]
R = inv(A)*F
printf("R1 = %6.3f\n",R(1))
printf("R2 = %6.3f\n",R(2))
Example 08
%*****Reaction at Cantilever Beam F1 F2
printf("Student No.2\n")
printf("**************\n")
F1 = 100 %KN
F2 = 50 %KN
L = 6 %m
L1 = 1 %m
FT = F1 + F2 %total force
MT = (L*F1) + (L1*F2) %total moment
A = [1,0; 0,1;]
F = [FT; MT;]
R = inv(A)*F
printf("RY = %6.3f\n",R(1))
printf("MA = %6.3f\n",R(2))
Example 09
printf("Student No.2\n")
printf("**************\n")
printf("**Solve Matrix***\n")
printf("**************\n")
A = [
-4, -11, 5, -5;
-11, -8, 10, -9;
-5, -5, 8, -7;
-2, -3, 8, -4;
]
F = [
-165;
-258;
-149;
-69;
]
disp "***********************"
R = inv(A)*F
printf("a = %6.3f \n",R(1))
printf("b = %6.3f \n",R(2))
printf("c = %6.3f \n",R(3))
printf("d = %6.3f \n",R(4))
#include <stdio.h>
int main()
{
int number;
printf("Enter an integer: ");
// reads and stores input
scanf("%d", &number);
// displays output
printf("You entered: %d", number);
return 0;
}
https://www.onlinegdb.com/online_c_compiler
*****Open C Online*****
// นำหน้า หมายถึง compiler จะไม่สนใจตั้งแต่ // จนสิ้นสุดบรรทัดนั้น
/* */ คลุม หมายถึง compiler จะไม่สนใจตั้งแต่ /* จนถึง */
Link->Data Types |
Link->C-input-output
Link->C-String
/* Example 1 */
#include <stdio.h>
int main()
{
printf ("Hello world!");
return 0;
}
/* Example 2 */
#include <stdio.h>
int main() {
int number;
printf("Enter an integer: ");
// reads and stores input
scanf("%d", &number);
// displays output
printf("You entered: %d", number);
return 0;
}
#include <stdio.h>
#include <string.h>
int main()
{
int i, found = 0;
char size[6]; //inch
char sv[20];
float dia = 0; //m.
float r = 0; //m.
float flow = 0; //cu.m./s
float v = 2; // m/s
char pipe_size[5][20] = {
"1","2","3","4","6"
}, name[10];
char pipe_diam[5][20] = {
"28.0","51.4", "76.2", "97.8", "141.6"
}, data[10];
printf("Enter Size [inch]: ");
scanf("%s",size);
printf("Enter Velocity [m/s]: ");
scanf("%s",sv);
for(i = 0; i < 5; i++)
{
if(strcmp(size, pipe_size[i]) == 0 )
{
found = 1;
//printf("data = %s" ,pipe_diam[i] );
sscanf(pipe_diam[i] , "%f", &dia); //convert string to float
sscanf(sv , "%f", &v); //convert string to float
r = (dia * 0.5) / 1000.0; //mm
flow = v * (3.14159 * r * r) * 1000; //liter/s
printf("flow [liter/s] = %f" , flow);
break; //out of for loop
}
}
return 0;
}
#include <stdio.h>
int main()
{
int cpucore = 8;
int camera = 3;
int ram = 64;
if (camera<2)
{
printf("Camera NOT Pass\n");
}
else
{
printf("Camera Pass\n");
}
if (cpucore>4)
{
printf("CPU CORE Pass\n");
}
else
{
printf("CPU CORE NOT pass\n");
}
if (ram>32)
{
printf("RAM Pass\n");
}
else
{
printf("RAM NOT pass\n");
}
return 0;
}
//***Example if 1***
#include <stdio.h>
int main()
{
int x = 20;
int y = 22;
if (x<y)
{
printf("Variable x is less than y");
}
return 0;
}
//***Example if else***
#include <stdio.h>
int main()
{
int x = 20;
int y = 22;
if (x<y)
{
printf("Variable x is less than y");
}
else
{
printf("Variable x is NOT less than y");
}
return 0;
}
#include <stdio.h>
int main()
{
int age = 18;
int height = 155;
int weight = 42;
if (height<=150)
{
printf("height NOT Pass\n");
}
else
{
printf("height Pass\n");
}
if (age<=20)
{
printf("age Pass\n");
}
else
{
printf("age NOT pass\n");
}
if (weight<=80)
{
printf("weight Pass\n");
}
else
{
printf("weight NOT pass\n");
}
return 0;
}
//***Example Loop 1***
#include <stdio.h>
int main () {
int a;
int b;
b = 1;
/* for loop execution */
for( a = 5; a > 0; a = a - 1 ){
b = b + 2;
printf("value of a: %d b: %d\n ", a ,b);
//printf("value of b: %d\n", b);
}
return 0;
}
//***Example for loop sum***
#include <stdio.h>
int main()
{
int i;
int sum;
sum = 0;
for (i=1; i<=3; i++)
{
sum = sum + i;
printf("%d\n", sum);
}
return 0;
}
//***Example for loop average***
#include <stdio.h>
int main()
{
int i;
float sum;
float avg;
sum = 0;
for (i=1; i<=6; i++)
{
sum = sum + i;
printf("i=%d , sum=%f\n", i,sum);
}
printf("i=%d \n",i);
//reduce i by 1
i = i - 1;
printf("***i=%d*** \n",i);
avg = sum / (float)i;
printf("%6.3f\n", avg);
return 0;
}
//***Example for loop array***
#include <stdio.h>
int main () {
int n[4][4]; /* n is an array of 3X3 integers */
int i,j;
for ( i = 0; i < 4; i++ ) {
for ( j = 0; j < 4; j++ ) {
n[j][i] = i; /* set element at location n[j][i] = i */
printf("n[%d][%d] = %d\n", i,j,n[j][i]);
}
}
return 0;
}
//***Example While Loop 1***
#include <stdio.h>
int main()
{
int count=1;
while (count <= 4)
{
printf("%d ", count);
count++;
}
return 0;
}
//***Example While Loop 2***
#include <stdio.h>
int main()
{
int x;
int y;
x = 5;
y = 2;
while (x > 0)
{
x = x - 1;
y = y * x;
printf("y = %d \n ", y);
}
return 0;
}
//***Example While Loop 3***
#include <stdio.h>
int main()
{
int i;
int j;
i = 1;
j = 0;
for ( i = 1; i <= 4; i++ ) {
if ((i-1)/2 == 0)
{
printf("i = %d \n ", i);
j = i +1;
}
}
return 0;
}
//***Example Do While Loop 1***
#include <stdio.h>
int main()
{
int j=0;
do
{
printf("Value of variable j is: %d\n", j);
j++;
}while (j<=3);
return 0;
}
/* Example 3.1 */
#include <stdio.h>
int main() {
short a;
long b;
long long c;
long double d;
printf("size of short = %d bytes\n", sizeof(a));
printf("size of long = %d bytes\n", sizeof(b));
printf("size of long long = %d bytes\n", sizeof(c));
printf("size of long double= %d bytes\n", sizeof(d));
return 0;
}
/* Example 3.2 */
#include <stdio.h>
int main() {
short a;
long b;
long long c;
long double d;
printf("size of short = %d bytes\n", (int)sizeof(a));
printf("size of long = %d bytes\n", (int)sizeof(b));
printf("size of long long = %d bytes\n", (int)sizeof(c));
printf("size of long double= %d bytes\n", (int)sizeof(d));
return 0;
}
/* Example 4 */
#include <stdio.h>
int main(){
char chr = 'a';
printf("character = %c.", chr);
return 0;
}
/* Example 5 */
#include <stdio.h>
int main() {
char first[100], last[100];
int i;
printf("nEnter your first name:");
scanf("%s", first );
printf("nEnter your last name:");
scanf("%s", last );
printf("nYour full name is: %s %sn", first, last );
printf("First name is: ");
for( i=0; i<100; i++ ){
if ((first[i] > 32) && (first[i] < 123)){
printf("%c ",first[i]);
}
}
printf("nLast name is: ");
for( i=0; i<100; i++ ){
printf("%c ",last[i]);
}
printf("n");
return 0;
}
https://octave-online.net/
*****Open Octave Online*****
A = [1,1,1; 0,2,5; 2,5,-1;] C = [6;-4;27;] x = inv(A) * C x
#
i = 2 * 4
i
#
x = 0 : 0.1 : 1;
x
y = [ 0 : 0.1 : 1];
y
#แก้ระบบสมการ
A = [1,1,1; 0,2,5; 2,5,-1;]
C = [6;-4;27;]
x = inv(A) * C
x
######plot1###############
x = 1:5; y = 1:5;
plot (x,y,"g");
title ("plot() of green line at 45 degrees");
######plot2###############
x = 1:5; y = 1:5;
plot (x,y,"g*");
title ("plot() of green stars along a line at 45 degrees");
###### plot function 1 #########
x = -10:0.1:10;
plot (x, sin (x));
###### plot function 2 #########
x = -10:0.1:10;
y = sin(x);
plot (x, y);
###### plot function 3 #########
x1 = 1:5; y1 = 1:5;
x2 = 5:9; y2 = 5:-1:1;
plot (x1,y1,"bo-", x2,y2,"rs-");
axis ("tight");
title ({"plot() of blue circles ascending and red squares descending";
"connecting lines drawn"});
###### plot function 4 #########
x = [0:10]';
y = [sin(x), cos(x)]
h = stem (x, y);
set (h(2), "color", "g");
set (h(1), "basevalue", -1)
###### Histogram 1 #########
hist (randn (10000, 1), 30);
###### Histogram 2 #########
h = bar (rand (5, 10));
set (h(1), "basevalue", 0.5);
###### Histogram 3 #########
h = bar (rand (10, 3));
set (h(1), "facecolor", "r")
set (h(2), "facecolor", "g")
set (h(3), "facecolor", "b")
###### Rose Map #########
[th, r] = rose ([2*randn(1e5,1), pi + 2*randn(1e5,1)]);
polar (th, r);
###### Contour 1 #########
x = 0:2;
y = x;
z = x' * y;
contour (x, y, z, 2:3)
###### Contour 2 #########
[x, y, z] = peaks (50);
contourf (x, y, z, -7:9)
***********************************
Sheet
*******************************************
<.p>
A = [1,1,1; 0,2,5; 2,5,-1;] C = [6;-4;27;] x = inv(A) * C x
***เลยกำหนดส่ง 5 ม.ค. 2563***