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

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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.

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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.

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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.

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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;
}

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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;
}

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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." );
		}
	}

}

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Further practice reading

• Armstrong number in C | C++ and Java
• Palindrome in C | C++ and Java
• Linear Search in C | C++ and Java
• Binary Search Algorithm
• Factorial program in C | C++ and Java
• Odd even program in c | c++ and java
• Bubble sort in c | c++ and java
• Reverse a number in c | c++ and Java
• Prime number WiKi
• Addition of two numbers in c | c++ and java

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