Thread: Mathematical Operation

prepare a report which contains the C source code, the documentation and the flow charts, along with drawings explaining the mathematical background related to the calculation of-



insert

Code:

F(x)= 5.x^2 + e ^(1/2.x) / 1/3.x^2+25.x+1.6

in the range x ∑{A,B}




With a step of B-a/y, e.g. y= 1000.




The range, i i.e. a,b along with the step discretisation should be user defined. The results of the calculation should be stored in a file in the current directory which is also user defined.




in a second independent program, calculate the area (integral from a to b)

f (x).dx for the discrete value of an f(x) passed to the program through a user defined file located in the current directory. The output of the previous program




in a third independent program calculate f`(x)= dy/dx for all values provided the output file of the first prgram with the assumption that dy/dx= ∆y/∆x, ∆x→0

How would I do this? I have taken a c language class but have never did equatons or mathematical operations, also how do flow charts work?

F(x)= 5.x^2 + e ^(1/2.x) / 1/3.x^2+25.x+1.6

What a hell is that! :S

that says that the function F(x) is equal to 5.x^2 + e ^(1/2.x) / 1/3.x^2+25.x+1.6 , the ^`s are used to show powers. e^(1.2.x) is exponent to the power of .5 times x. Do you understand now? I only know the basics of C, but am not sure whether a source code is correct or has errors. Can someone please help me with the source code?

Can someone please help me with the source code?

Where is it? May us help you?

insert

Code:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
main ()
{
double a,b,x;
printf("range[a,b]=");
scanf("%lf %lf",&a,&b);

printf("input [a,b]=(%lf %lf)\n",a,b)
if (a>b)
{
printf("error:a>b\n");
exit(1);
}
FILE *fd;
if((fd=fopen("sample.txt","w"))==NULL)
{
printf("cannot open file.\n");
}
x=a;
while(x<=b)
{
fprintf(fd,"%lf\t%lf\n",x,(3+exp(0.5*x))/0.3*x*X+25*x+1.6));
x=x+(b-a)/1000;
}
close(fd);
exit(0);
}

This is the source code for the first problem, is it correct? how can i do the flow charts and documentation?

Originally Posted by madahmad1

This is the source code for the first problem, is it correct? how can i do the flow charts and documentation?

It's your code, didn't you run it and see if it gives the right answer on several test sets of data?

You just post up code, but didn't test it! Brilliant! Absolutely *brilliant*!

Usually, you do flow charts by seating yourself, reviewing you class notes and text books on flow charts, and beginning the work. And let me emphasize the YOU DOING the WORK, part of it.

Ditto with your request for the program's documentation.

There is no big shortcut to learning how to program - *you* have to do a lot of work, plain and simple.

Can I get any of your emails to contact you guys? I do not have the program to test the code, thats the problem. Can anyone test it for me? I would really appreciate it.

Can I get your email laserlight? I would like to contact you about something.Thanks for your help, I will try downloading these compilers.

Can anyone here give me help outside of the message board? Just post your email address.