1 #include <stdio.h> 2 3 extern void prog1(void); 4 extern void prog2(void); 5 main(int argc,char * argv[])6 int main(int argc, char *argv[]) 7 { 8 printf("Hello from program.c\n"); 9 prog1(); 10 prog2(); 11 return 0; 12 } 13