Write a C program to find sum of all even numbers between 1 to n using while loop

//Write a C program to find sum of all even numbers between 1 to n.

#include "stdio.h"

int main (){

int num,i,sum;

printf ("Enter the value of number :\n");

scanf ("%i",&num);

i=2;

while(i<=num){

sum=sum+i;

i=i+2;

}

printf ("The sum of all even numbers between 1 to n is %i",sum);

return 0;

}

  output                   output                       output                    output          

Enter the value of number :

10

The sum of all even numbers between 1 to n is 30