C PRACTICAL / FIND SUM OF FIRST N odd AND even NUMBER

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>> /* WRITE A PROGRAM TO FIND SUM OF FIRST N odd AND even NUMBER */

#include<stdio.h>

#include<conio.h>

void main()

{

    int a=0, b, sum1=0,sum2=0;

    clrscr();

    printf("enter your number : \n");

    scanf("%d",&b);

    while(a<=b){

       if(a%2==0){

//  printf("%d\t",a);

  sum1 = sum1 + a;

       } // first if close

if(a%2!=0){

//  printf("%d\t",a);

  sum2 = sum2 + a;

       }// second if close

      a++;

    }

    printf("\n even number sum : %d\n",sum1);

    printf("\n odd number sum : %d\n",sum2);

    getch();

}

   /*  OUTPUT  */

======================

enter your number : 

10

 even number sum : 30

 odd number sum : 25

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