problem with using sin,cos,log etc in c program in ubuntu7.04

You should install "build-essential", a meta-package that brings in all the required development packages.

Then, programs like

#include <math.h>

int main(void)
{
        float f = 10;

        sin(f);

        return 0;
}

should work like a charm (gcc sample.c -o sample).

as you told me to install the "build-essential" metapackage ,i did so but still then the same problem takes place.

Can you post please
1) A minimal C program that does not compile on your computer? How about the program I put above? Does that work for you?
2) The command line you use to compile the program.
3) The full output from the compilation, any errors or warnings.

ok thank u sir for ur kind coperation. I am attaching these program as well as comands and outputs.
the program name is test1.c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
 main()
{float x,y;
printf("enter the value of x\n");
scanf("%f",&x);
 printf("Hello world\n");
y=sin(x);
printf("value of y is = %f \n",y);
 printf("\nEnd of program\n");
 }
i compiled by both cc and gcc. their outputs are as follows.
mplab95@mplab95-desktop:~$ cc test1.c
/tmp/ccGC5GZ9.o: In function `main':
test1.c:(.text+0x43): undefined reference to `sin'
collect2: ld returned 1 exit status
mplab95@mplab95-desktop:~$ gcc test1.c
/tmp/ccKLD7cp.o: In function `main':
test1.c:(.text+0x43): undefined reference to `sin'
collect2: ld returned 1 exit status
mplab95@mplab95-desktop:~$

I do not have a compiler on this computer.

The error you get is that the linker cannot link in the mathematical functions in the final executable.
There are two things you can do,

1. Can you please try the following command line

gcc -o test1 test1.c

2. Can you please try

gcc -o test1 -lm test1.c

The "-lm" option means to link in the library with the mathematical functions.

For some reason on my system I do not need to put "-lm". Maybe because I use "gcc" instead of "cc" in order to run the compiler (it's the same program in both cases).

I hope this helps.

as u told i tried with
gcc -o test1 test1.c
still then the same problem takes place like
mplab95@mplab95-desktop:~$ gcc -o test1 test1.c
/tmp/ccwJvhS4.o: In function `main':
test1.c:(.text+0x43): undefined reference to `sin'
collect2: ld returned 1 exit status
mplab95@mplab95-desktop:~$

but when i tried with
gcc -o test1 -lm test1.c
then no error is shown like
mplab95@mplab95-desktop:~$ gcc -o test1 -lm test1.c
mplab95@mplab95-desktop:~$

but there is no output ie when i am executing
./a.out
it shows like this
no such file found.
can u please provide me the solution.
                                                                                   THank u.

Hey, you just made it!

In the command

$ gcc -o test1 -lm test1.c

"-o test1" means to use the name "test1" for the compiled program. Your executable is "test1", not the default "a.out". If you did not specify a name with "-o", you would get the standard "a.out".

Therefore, run

./test1

thank you very much.u solved my problem.