#include <stdio.h>

int main(int argc, char *argv[])
{
     FILE *f;
     char buffer[80];

     f=popen("echo Hello_parent", "r");
     if(!f) {
          fprintf(stderr, "popen error\n");
          return -1;
     }
	
     fscanf(f, "%s", buffer);
     pclose(f);

     printf("Child said: \"%s\"\n", buffer);

     return 0;
}