Prime Number in C++

 Machine Problem 

A number which is only divisible by itself and 1 is known as prime number,  for example: 7 is a prime number because it is only divisible by itself and 1.

Write a program to ask the user to give a number and then the problem will check and determine if the given number is a prime number or not.

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Program Listing

prime_number.cpp

// prime_number.cpp

//

// Machine Problem

//

// A number which is only divisible by itself and 1 is known as prime number, 

// for example: 7 is a prime number because it is only divisible by itself and 1.

//

// Write a program to ask the user to give a number and then the program will

// check and determine if the given number is a prime number or not.

// 

//  Jake Rodriguez Pomperada, MAED-IT, MIT

//  www.jakerpomperada.com   www.jakerpomperada.blogspot.com

// jakerpomperada@gmail.com

// Bacolod City, Negros Occidental Philippines.

#include <iostream>

int num_val=0,i=0;

bool flag = true;

   

int main(){

   

   std::cout << "\n\n";

   std::cout << "\tPrime Number in C++";

   std::cout << "\n\n";

   std::cout<<"\tGive a Number (Positive Number Only) : ";

   std::cin>>num_val;

   std::cout << "\n";

     

   for(i = 2; i <= num_val / 2; i++) {

      if(num_val % i == 0) {

         flag = false;

         break;

      }

   }

   

   if (flag==true) {

         std::cout<<"\tThe given number "<<num_val<<" is a prime number.";

       }

   else {

      std::cout<<"\tThe given number "<<num_val<<" is not a prime number.";

    }

   std::cout <<"\n\n";

   std::cout <<"\tEnd of Program\n";

 }