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
  

• Test Case 1

  
  Input (stdin)

  10
  
  

  Expected Output

  Sum=55

• Test Case 2

  
  Input (stdin)

  20
  
  

  Expected Output

  Sum=210

• Program

• #include <stdio.h>
  int main()
  {
    int n,i,sum=0;
    scanf("%d",&n);
    for(i=0;i<=n;i++)
    sum=sum+i;
    printf("Sum=%d",sum);
    
  
   return 0;
  }