text: /*Exercise 3 - Repetition
  
  Write a C program to calculate the sum of the numbers from 1 to n.
  Where n is a keyboard input.
  
  e.g.
  
  n -> 100
  sum = 1+2+3+....+ 99+100 = 5050
  
  n -> 1-
  sum = 1+2+3+...+10 = 55 */
  
  #include <stdio.h>
  int main() {
    
    int i , n , a;  //define variables
    int sum;
  
  
    printf("Enter a value for n :");   //ask user to input value for n
    scanf("%d" , &n);
  
    for(i=1 ; i <= n ; i++)
    {
      sum += i;  // calculation
  
    }
  
        printf("\nSum = %d" , sum);  //print sum
  
    return 0;
  }
  
  