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What is the output of following C code?

#define FALSE -1
#define TRUE 1
#define NULL 0
main() {
if(NULL)
puts("NULL");
else if(FALSE)
puts("TRUE");
else
puts("FALSE");
}

A.	Error	B.	NULL
C.	FALSE	D.	TRUE

Answer and Explanation

Answer:TRUE

Explanation:
Preprocessor doesn't replace the values given inside the double quotes. The check by if condition is boolean value false so it goes to else. In second if -1 is Boolean value true hence "TRUE" is printed.

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