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C Preprocessor

Q1:

What will be the output of the program? 
#include<stdio.h>
#define MAX(a, b, c) (a>b ? a>c ? a : c: b>c ? b : c)

int main()
{
    int x;
    x = MAX(3+2, 2+7, 3+7);
    printf('%d\n', x);
    return 0;
}

A 5

B 9

C 10

D 3+7

ANS:A - 5

The macro MAX(a, b, c) (a>b ? a>c ? a : c: b>c ? b : c) returns the biggest of given three numbers. Step 1: int x; The variable x is declared as an integer type. Step 2: x = MAX(3+2, 2+7, 3+7); becomes, => x = (3+2 >2+7 ? 3+2 > 3+7 ? 3+2 : 3+7: 2+7 > 3+7 ? 2+7 : 3+7) => x = (5 >9 ? (5 > 10 ? 5 : 10): (9 > 10 ? 9 : 10) ) => x = (5 >9 ? (10): (10) ) => x = 10 Step 3: printf('%d\n', x); It prints the value of 'x'. Hence the output of the program is '10'.



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