c - sqrt() function link error -

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the following code throwing undefined symbol error on linux.

$ cat rms.c /* sqrt example */ #include <stdio.h> #include <math.h>  int main () {   double param, result;   param = 1024.0;   result = sqrt (param);   printf ("sqrt(%lf) = %lf\n", param, result );   return 0; }   $ gcc rms.c /tmp/ccawecfp.o(.text+0x24): in function `main': : undefined reference `sqrt' collect2: ld returned 1 exit status

if replace argument sqrt() (double)16 program compiling , executing. why throwing error in first case.

this linker error.

the linker missing implementation of sqrt(). resides in library libm.

tell gcc add applying option -lm.


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