Question

Write a program using the fork() system call to do thefollowing. The parent process (main program) forks a process(CHILD 1) to compute and print the sum of first n integers where n is a variable shared between the parent and CHILD 1. Have the parent invoke the wait () call to wait for both the child processesto complete before exiting the program. IN A C program

Answer 1

Solution:

#include<stdio.h>
#include<unistd.h>
#include<sys/wait.h>
#include<sys/types.h>
void main()
{
   int n,pid,stat;

   printf("Enter the value of n:");
   scanf("%d",&n);
   pid=fork();
  
   if(pid==0)
   {
       int i,sum=0;
       for(i=1;i<=n;i++)
           sum=sum+i;
       printf("Sum of first %d numbers is %d\n",n,sum);
   }
   else
   {
       wait(&stat);
       printf("Child process's pid is %d\n",pid);
   }
}

Output: