What is the answer of below code? Justify the answer!

Question

#include<stdio.h>
#include<conio.h>
#define clrscr() 100
int main()
{
clrscr();
printf("%d",clrscr());

}

Answer 1

100
As define preprocessor will change clrscr() by 100 in all over the program.So after define, program will change as follow:
#define clrscr() 100
int main()
{
100;
printf("%d",100);
}

Answer 2

100? *_*
I understand about define more with this now