Calculating sum of numbers from 1 to n

C Program

1.For Loop

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int n,i,sum=0;
    printf("Enter any number:");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
      {
        sum = sum + i;
      }
   printf("Sum of numbers from 1 to %d is %d",n,sum);
}

2.While Loop

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int n,i,sum=0;
    printf("Enter any number:");
    scanf("%d",&n);
    i =1;
   while(i<=n)
   {
       sum = sum+i;
       i++;
   }
   printf("sum of number from 1 to %d is %d",n,sum);
}

3.Do While Loop

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int n,i,sum=0;
    printf("Enter any number:");
    scanf("%d",&n);
    i =1;
    if(n!=0)
    {
       do
        {
          sum = sum+i;
          i++;
        }while(i<=n);
        printf("sum of number from 1 to %d is %d",n,sum);
    }
}

Java Program

1.For Loop

import java.util.Scanner;

public class SumTillN {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		System.out.print("Enter Any Number:");
		int n = s.nextInt();
      int sum=0;
      for(int i=1;i<=n;i++)
      {
         sum = sum + i;
      }
      System.out.print("Sum of numbers from 1 to " + n + " is " + sum);
   }

}

Java Program

2.While Loop

import java.util.Scanner;

public class SumTillN {
     public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		System.out.print("Enter Any Number:");
		int n = s.nextInt();
      int sum=0,i=1;
      while(i<=n)
      {
          sum = sum+i;
          i++;
      }
      System.out.print("sum of number from 1 to" + n +" is "+sum);
   }
}

Java Program

3. Do While Loop

import java.util.Scanner;

public class SumTillN {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		System.out.print("Enter Any Number:");
		int n = s.nextInt();
      int sum=0,i=1;
      if(n!=0)
      {
         do
          {
            sum = sum+i;
            i++;
          }while(i<=n);
          System.out.print("sum of number from 1 to " + n +" is "+sum);
      }  
	
	}
}