12 lines · c
1#include <stdio.h>2 3extern int a(int);4extern int b(int);5extern int c(int);6int main (int argc, char const *argv[])7{8 printf ("a(1) returns %d\n", a(1));9 printf ("b(2) returns %d\n", b(2));10 printf ("c(2) returns %d\n", c(2));11}12