Programming in C to identify the Odd & Even number within limit and their sum separately.

#include<stdio.h>
#include<conio.h>
void main()
{
int a=1,n,suma=0,sumb=0;
printf("Define your limit: ");
scanf("%d",&n);
printf("ODD \t EVEN");
while (a<n)
{
if (a%2!=0)
{
printf("\n%d \t %d",a++,a);
sumb=sumb+a;
suma=suma+a-1;
printf("\t   ");
}
a++;
}
printf("\n=============");
printf("\n%d \t %d",suma,sumb);
}