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okie thank you:)

Thank you all
But i am not still able to understand how i am getting the output -1,-1,2(right-left or left-right, in either case)

#include<stdio.h>
#include<conio.h>
void main()
{
int a=1;
clrscr();
printf("%d,%d,%d",a++ - a,a - a--,a++ - ++a);
getch();
}