Programming

for (i = 0; i < 5; i++) {

        if (fork() < 0) {
            //print error
        }

        else if (fork() == 0) {
            //run a program (exec(...)
        }

        else {
            p_id = wait(&result);
        }
    }

pid_t pid=fork();
if(pid < 0)
{
  // error
}
else if(pid == 0)
{
  // child code
  exit(0); // to prevent it executing code below.  after all what if exec fails?
}
else if(pid > 0)
{
  // parent code.
}

#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>

int main(void)
{
  int total=0;
  int n;

  for(n=0; n<4; n++)
  {
      pid_t pid=fork();
      if(pid == 0)  // This code is executed in the child
        return(42); // the child returns from main, stopping execution

    // The parent continues looping.
  }

  for(n=0; n<4; n++)
  {
    int status;
    wait(&status);
    total += WEXITSTATUS(status);
  }

  printf("The total is %d\n", total);
  return(0);
}