Question

Write a program that accepts an integer as input and then displays all the prime numbers smaller than or equal to that number.

Answer 1

//Java

import java.util.Scanner;

public class Prime {
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       System.out.println("Enter n: ");
       int n = sc.nextInt();
       for (int i = 2; i < n; i++) {
               if(isPrime(i))
                   System.out.println(i);
       }
   }

   //checking if given num is prime
   private static boolean isPrime(int aI) {
       for (int i = 2; i < aI; i++)
           if (aI % i == 0)
               return false;
       return true;
   }
}

// Cpp:

#include <iostream>

using namespace std;
//checks and returns true if given num is prime
bool isPrime(int aI) {
       for (int i = 2; i < aI; i++)
           if (aI % i == 0)
               return false;
       return true;
   }
int main(){
   int end;
   cout<<"Please a numbers: ";
   cin>>end;
   for(int i=2;i<end;i++){
       if(isPrime(i)){
           cout<<i<<" ";
       }
      
   }
  
return 0;
}

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