SUM OF NATURAL NUMBERS

• Problem Description

  
  write a c Program to calculate the sum of first n natural numbers and Positive integers 1,2,3...n are known as natural numbers
  

• CODING ARENA

• #include <stdio.h>

  int main()

  {

    int i,sum=0,n;

    scanf("%d",&n);

    for(i=1;i<=n;i++)

    {

      sum=sum+i;

    }

    printf("Sum=%d",sum);

    return 0;

  }

• Test Case 1

  
  Input (stdin)

  10
  
  

  Expected Output

  Sum=55

• Test Case 2

  
  Input (stdin)

  20
  
  

  Expected Output

  Sum=210