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 num, i, sum = 0;   
      printf(" Enter a number: ");  
      scanf("%d", &num);  
        
      for (i = 0; i <= num; i++)  
      {  
          sum = sum + i;
      }  
      
      printf("\n Sum of the first %d number is: %d", num, sum);   
       
    return 0;
  }
  
  