Program to find sum of integers from 1 to n

#include<stdio.h>
#include<conio.h>
void main()
{
               int i,a,sum=0;
              printf("Enter the last integer:");
             scanf("%d",&a);
             for(i=1;i<=a;i++)
            {
                      sum=sum + i;
            }
            printf("The sum of integers from 1 to %d is %d",a,sum);
           getch();
}

Program to find sum of integers from 1 to n

Output for sum of integers from 1 to n