#include< stdio.h >
int leapprog(int year)
{
//checking divisibility by 4
 if(year%4 == 0)
 {
//checking divisibility by 100
 if( year%100 == 0)
 {
//checking divisibility by 400
 if ( year%400 == 0)
 printf("%d, the year entered happens to be a leap year", year);
 else
 printf("%d is surely not a leap year", year);
 }
 else
 printf("%d, the year entered happens to be a leap year", year );
 }
 else
 printf("%d is surely not a leap year", year);
 return 0;
}
int main()
{
 int input_year, val;
 printf("Enter the year that you want to check"); //enter the year to check
 scanf("%d",&input_year);
 val = leapprog(input_year); 
return 0;
}
      

         
#include<stdio.h>
using namespace std;
//main program
int main()
{
 //initialising variables
 int year;
 cout<<"Enter year to check: ";
 //user input
 cin>>year;
 //checking for leap year
 if( ((year % 4 == 0)&&(year % 100 != 0)) || (year % 400==0) )
 {
 //input is a leap year
 cout<<year<<" is a leap year";
 }
 else
 {
 //input is not a leap year
 cout<<year<< " is not a leap year";
 }
 return 0;
}
      

       
import java.util.Scanner;
public class Main
{
 public static void main(String[] args)
 {
 //scanner class declaration
 Scanner sc=new Scanner(System.in);
 //input year from user
 System.out.println("Enter a Year");
 int year = sc.nextInt();
 //condition for checking year entered by user is a leap year or not
 if((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
 System.out.println(year + " is a leap year.");
 else
 System.out.println(year + " is not a leap year.");
 }
}
      

  
num = int(input("Enter the year you want to check if is leap year or not: "))
#take input year from the user to check if it is a leap year
if(num%4 == 0):
#check if the number is divisible by 4 and if true move to next loop
if(num%100 == 0):
#check if the input year is divisible by 100 and if true move to next loop
if(num%400 == 0):
print("The year {} is a leap year".format(num))
#the input year is divisible by 4, 100 and 400, hence leap year.
else:
print("The year {} is Not a leap year".format(num))
else:
print("The year {} is a leap year".format(num))
#if the number is divisible by both 4 and 100 it is a leap year
else:
print("The year {} is Not a leap year".format(num))
#if the input num is not divisible by 4 then it can not be a leap year altogether.

#include<stdio.h>
void prime(int n)
{
int c=0;
 for(int i=2;i<n;i++)
 {
 if(n%i==0)
 c = c+1;
 }
 if(c>=1)
 printf("%d is not a prime number",n);
 else
 printf("%d is a prime number",n);
}
void main()
{
int n;
printf("Enter no : "); //enter the number
scanf("%d",&n);
if(n<0)
 {
 printf("Please enter a positive integer");
 }
else
 prime(n);
}

#include
using namespace std;
//function declaration
void enter();
void check(int);
void prime(int);
//main program
int main()
{
enter();
return 0;
}
//function to enter value
void enter()
{
int num;
cout<<"Enter number:"; 
cin>>num; 
check(num);
}
//function to check whether the input is positive or negative
void check(int num)
{
if(num<0)
{
cout<<"invalid input enter value again"<<endl;
enter();
}
else
{
prime(num);
}
}
//function to check for prime number
void prime(int num)
{
int i,div=0; 
for(i=1;i<=num;i++) 
{
if(num%i==0)
{
div++; 
}
}
//prime number only have two divisors
if(div==2)
{
cout<<num<<" is a prime number";
}
//not a prime number
else
{
cout<}
Output:
Enter number:29
29 is a prime number.

if the number is negative then ask the user to re-enter the number*/
//Prime number is a number which is divisible by 1 and another by itself only.
import java.util.Scanner;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//input a number from user
System.out.println("Enter the number to be checked : ");
int n = sc.nextInt();
//create object of class CheckPrime
Main ob=new Main();
//calling function with value n, as parameter
ob.check(n);
}
//function for checking number is positive or negative 
void check(int n)
{
if(n<0)
System.out.println("Please enter a positive integer");
else
prime(n);
}
//function for checking number is prime or not 
void prime(int n)
{
int c=0;
for(int i=2;i<n;i++)
{
if(n%i==0)
++c;
}
if(c>=1)
System.out.println("Entered number is not a prime number");
else
System.out.println("Entered number is a prime number");
}
}

def prime(n):
if n > 1:
for i in range(2, n):
if (n % i) == 0:
print(n, "is not a prime number")
break
else:
print(n, "is a prime number")
num = int(input("enter a number: "))
if (num > 0):
prime(num)
else:
print("please enter a positive number")