pow function in C
c, gcc, math.h, pow
Solution
Your program doesn't output anything.
The 0 you are referring to is probably the exit code, which will be 0 if you don't explicitly return from `main`.
Try changing it to a standards-compliant signature and return `b`:
int main(void) {
...
return b;
}
Note that the return values is essentially limited to 8 bits-worth of information, so very, very limited.
Use `printf` to display the value.
#include <stdio.h>
...
printf("%f\n", b);
...
You must use a floating point conversion specifier (`f`, `g` or `e`) to print `double` values. You cannot use `d` or others and expect consistent output. (This would in fact be undefined behavior.)
Problem
I write a C code that have power function that is from math.h library. when I compiled my program, I received an error which is " undefined reference to 'pow' function ", I compile my program using gcc compiler (fedora 9). I insert -lm flag to gcc then, the error is omitted but the output of the pow function is 0. ``` #include<math.h> main() { double a = 4, b = 2; b = pow(b,a); } ``` Can anyone help me? Is there is a problem in my compiler?? Thanks.