Question

Write a program in C using the fork() system call to do the following. 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. It also forks another process (CHILD 2) that finds the sum of squares of the first n numbers where n is a variable it shares with the parent. Let CHILD 1 print “The sum of the first ** integers is: ****”.
Let CHILD 2 print “The sum of the square of the first ** integers is: ****”. Have the parent invoke the wait () call to wait for both the child processes to complete before exiting the program.

Answer 1

SOURCE CODE

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

int main()
{
   int n,i,sum=0,ssum=0;
   printf("\nEnter the value of n :");
   scanf("%d",&n);
          
   int c1 = fork();   // First Child
   int c2 = fork();    // Second Child

   if (c1 > 0 && c2 > 0 )   // PARENT PROCESS
   {
       wait(NULL);
   }
   else if (c1 == 0 && c2 > 0) //First Child Process
{
  
for(i=1;i<=n;i++)
   sum=sum+i;
printf("Sum of first %d integers is %d \n",n,sum);
  
}
else if (c1 > 0 && c2 == 0)   //Second Child Process
{
   for(i=1;i<=n;i++)
   ssum=ssum+(i*i);
printf("Sum of the square of the first %d integers is %d \n",n,ssum);
  
}
   return 0;
}

OUTPUT

Enter the value of n :7
Sum of first 7 integers is 28
Sum of the square of the first 7 integers is 140

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Answer 2

Write a program in which child take the input from user and parent is required to print that input?