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#ifndef FUNCTION03_H_
#define FUNCTION03_H_
 
#include <stdio.h>
 
int median(int a, int b, int c);
 
int main() {
  int a, b, c;
  scanf("%d%d%d", &a, &b, &c);
  double x1, x2;
  int ans = median(a, b, c);
  printf("%d\n", ans);
  return 0;
}
#endif // FUNCTION03_H_

prog.c: In function ‘main’:
prog.c:11:14: warning: unused variable ‘x2’ [-Wunused-variable]
   double x1, x2;
              ^~
prog.c:11:10: warning: unused variable ‘x1’ [-Wunused-variable]
   double x1, x2;
          ^~
prog.c:10:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d", &a, &b, &c);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /home/BTDv1M/ccTv1FBo.o: in function `main':
prog.c:(.text.startup+0x3c): undefined reference to `median'
collect2: error: ld returned 1 exit status

Standard output is empty