Question

4. Write a program that takes an integer as input and returns whether it is a prime number or not in C++. (Using if, loops, or/and bool only)

Answer 1

the output of the above program is:

code for copy:

#include<iostream>
using namespace std;
int main()
{
   //declare the integer variable n
   int n;
   //declare boolean variable b and assign true to it
   bool b=true;
   //enter the value of n
   cout<<"enter the value of n:";
   //read the value of n
   cin >> n;
   //for loop takes range from 2 to n-1
   for(int i=2;i<n;i++)
   {
       //if any of the number between 2 to n-1 is divisible by then the number is not prime
       if(n%i==0)
       {
           //print the given number is not prime.
           cout<<"The number is not prime."<<endl;
           //make bool=false if the number is not prime
           b=false;
           break;
       }
   }
   //if b is equal to true then the number is prime.
   if(b==true)
   {
       //print the given number is prime
       cout<<"The number is prime."<<endl;
       return 0;
   }
}

I HOPE THIS WILL HELP YOU....