Write a c/c++ program that forks four processes from the same parent. The first

Question

Write a c/c++ program that forks four processes from the same parent. The first process should find the prime numbers in the range 2-1000 and save them in a file named primes_2_1000.txt. The first process should find the prime numbers in the range 1001-2000 and save them in a file named primes_1001_2000.txt. The first process should find the prime numbers in the range 2001-3000 and save them in a file named primes_2001_3000.txt. The first process should find the prime numbers in the range 3001-4000 and save them in a file named primes_3001_4000.txt. The parent process should wait for the children to terminate.

Explanation / Answer

here is your program : --------------------->>>>>>>>>>>>>>>

/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

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

void fun1(){
    int i = 2;
    FILE *fp;
    fp = fopen("primes_2_1000.txt","w");
    if(fp == NULL){
        return;
    }
    int st = 0,j;
    for(;i<=1000;i++){
        st = 0;
        for(j = i-1;j > 1;j--){
            if(i%j == 0){
                st = 1;
                break;
            }
        }
        if(st == 0){
            fprintf(fp,"%d ",i);
        }
    }
    fclose(fp);
}

void fun2(){
    int i = 1001;
    FILE *fp;
    fp = fopen("primes_1001_2000.txt","w");
    if(fp == NULL){
        return;
    }
    int st = 0,j;
    for(;i<=2000;i++){
        st = 0;
        for(j = i-1;j > 1;j--){
            if(i%j == 0){
                st = 1;
                break;
            }
        }
        if(st == 0){
            fprintf(fp,"%d ",i);
        }
    }
    fclose(fp);
}

void fun3(){
    int i = 2001;
    FILE *fp;
    fp = fopen("primes_2001_3000.txt","w");
    if(fp == NULL){
        return;
    }
    int st = 0,j;
    for(;i<=3000;i++){
        st = 0;
        for(j = i-1;j > 1;j--){
            if(i%j == 0){
                st = 1;
                break;
            }
        }
        if(st == 0){
            fprintf(fp,"%d ",i);
        }
    }
    fclose(fp);
}

void fun4(){
    int i = 3001;
    FILE *fp;
    fp = fopen("primes_3001_4000.txt","w");
    if(fp == NULL){
        return;
    }
    int st = 0,j;
    for(;i<=4000;i++){
        st = 0;
        for(j = i-1;j > 1;j--){
            if(i%j == 0){
                st = 1;
                break;
            }
        }
        if(st == 0){
            fprintf(fp,"%d ",i);
        }
    }
    fclose(fp);
}

int main()
{
    int pid[4];
    int status[4];
   
    pid[0] = fork();
    if(pid[0] == 0){
        fun1();
    }
    pid[1] = fork();
    if(pid[1] == 0){
        fun2();
    }
    pid[2] = fork();
    if(pid[2] == 0){
        fun3();
    }
    pid[3] = fork();
    if(pid[3] == 0){
        fun4();
    }
    int i;
    for(i = 0;i<4;i++){
        waitpid(pid[i],&status[i],0);
    }

    return 0;
}

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.