WHAT IS WRONG WITH MY PROGRAM ???

It shows this hint:

/tmp/ccUAdJtL.o: In function `main':

test_math.c:(.text+0x43): undefined reference to `sinf'

collect2: error: ld returned 1 exit status

This is my program:

#include #include

int main(){ float in,out; printf("Input a float number: "); scanf("%f", &in); out=sinf(in); printf("Output: %f ",out); return(0); }