preprocessor directives?

[honne gowda gowda <honnegowda@xxxxxxxxxx>]

hi,

can somebody explain the following piece of code:

#include<stdio.h>
main()
{
int first=0,second=1;

printf("%d:%d\n",first,second);
#define first second
#define second first
printf("%d:%d\n",first,second);
exit(0);
}

thanx in advance






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