pow() refuses to take two variables

[yougene]

It works fine with 1 variable one value. I don't understand why.

/tmp/cc4KSEcQ.o: In function `main':
test.c:(.text+0x2f): undefined reference to `pow'
collect2: ld returned 1 exit status

#include <math.h>
#include <stdio.h>

int main()
{
	int x = 2, y = 3;
	printf( "%.2f\n", pow( y, x ) );
	return 0;
}

[root4]

did you link correctly your binary with the math library (-lm)?

[yougene]

No, what does -lm do?

[IceDane]

You included the math header, which contains all constants and prototypes for the functions, but where do you think the code itself is held?

The math library is too large to be linked to all programs. You need to use "-lm" which pretty much stands for "link math(library)", and include math.h.

[yougene]

thanks