C program for checking whether 'n' numbers are odd or even and hence find their sums

//coded by Z
#include<stdio.h>
void main()
{
int i,n,r,s,sum1,sum2;
clrscr();
printf("\nEnter a no:");
scanf("%d",&n);
r=n%2;
(r==0)?printf("\nEVEN"):printf("\t\t\tODD");
sum1=0;
sum2=0;
r=2;
s=1;
while(r&&s<=n)
{
printf("\n%d",r);
printf("\t\t\t%d",s);
sum1=sum1+r;
r=r+2;
sum2=sum2+s;
s=s+2;

}
printf("\n\nSUM1=%d",sum1);
printf("\t\t\tSUM2=%d",sum2);
getch();
}