Prime number program in c | c++ and java

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Topics
What is prime number?
Prerequisite programming concepts for prime number program in c c++ and java
Logic to check prime number
Prime number program in c
Prime number program in c++
Prime number program in java
Further programming practices

What is prime number?

Prime number is a number which can only be divided completely by 1 and that number.

Examples : 1, 2, 3, 5, 7, 9, 11,13, 15, 17, 19.


Logic to check prime number

Input the number. Iterate from 2 to 9. For each iteration check whether the number divisible completely or not. If that number is divides completely then that is not a prime number. We can make use of modulus operator in an if else condition check to confirm that number is divisible completely or not.


Prerequisite programming concepts for prime number program in c c++ and java

  • Datatype in c | c++ and java.
  • For loop in c | c++ and java.
  • If else in c | c++ and java.
  • Input output operation in c | c++ and java.
  • Modulus operator in c | c++ and java.
  • Comparisn operator c | c++ and java.

Prime number program in c

#include<stdio.h>
int main(int argc, char const *argv[])
{
	printf("\nPrime number program in c\nEnter a number to check for prime number in c \n");
	int number;
	scanf("%d",&number);
	int is_prime=1;
	for( int i=2 ; i<10 ; i++ )
	{
		if( i == number )
			continue;
		if( ( number % i ) == 0 )
		{
			is_prime=0;
			break;
		}
	}
	if( is_prime )
	{
		printf( "\n%d is a prime number.\n",number );
	}
	else
	{
		printf( "\n%d is not a prime number.\n",number );
	}
	return 0;
}
Prime number program in c
Prime number program in c

Prime number program in c++

#include<iostream>
using namespace std;
int main(int argc, char const *argv[])
{
	cout<<"\nPrime number program in c\nEnter a number to check for prime number in c++ \n";
	int number;
	cin>>number;
	int is_prime=1;
	for( int i=2 ; i<10 ; i++ )
	{
		if( i == number )
			continue;
		if( ( number % i ) == 0 )
		{
			is_prime=0;
			break;
		}
	}
	if( is_prime )
	{
		cout<<"\n"<<number<<" is a prime number.\n";
	}
	else
	{
		cout<<"\n"<<number<<" is not prime number.\n";
	}
	return 0;
}
Prime number program in c++
Prime number program in c++

Prime number program in java

import java.util.Scanner;

public class PrimeNumberInJava {

	public static void main(String[] args) {
		int number=0;
		Scanner stdin = new Scanner( System.in );
		System.out.println( "Prime number program in java.");
		System.out.println( "Enter a number.");
		number = stdin.nextInt();
		boolean isPrime=true;
		for( int i=2 ; i<=9 ; i++  ) {
			if( i == number )
				continue;
			if( ( number % i ) == 0 ) {
				isPrime=false;
				continue;
			}
		}
		if( isPrime )
		{
			System.out.println( number+" is a prime number." );
		}
		else
		{
			System.out.println( number+" is not prime number." );
		}
	}

}
Prime number program in java
Prime number program in java

Further practice reading