To print sum of Natural Numbers from 1 to given Number

 Program:

#include<stdio.h>

#include<conio.h>

void main()

{

    int n, i=1, sum=0;

    clrscr();

    printf("Enter a Number : ");

    scanf("%d", &n);

    while(i<=n)

    {

        sum= sum + i;

        i++;

    }

    printf("Sum of  Natural Numbers from 1 to  %d is : %d", n, sum);

    getch();

}

Output:

Enter a Number : 10

Sum of Natural Numbers from 1 to 10 is : 55

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