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  Answer/Explaination : 

100


(Exp):
Preprocessor executes as a seperate pass before the execution of the 
compiler. So textual replacement of clrscr() to 100 occurs.The input program to compiler 
looks like this :
main()
{
100;
printf("%d\n",100);
}
Note:
100; is an executable statement but with no action. So it doesn't give any 
problem
 
 

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