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C | Loops & Control Structure | Question 2

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  • Difficulty Level : Medium
  • Last Updated : 12 Jan, 2013
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#include <stdio.h>
#define PRINT(i, limit) do \
                        { \
                            if (i++ < limit) \
                            { \
                                printf("GeeksQuiz\n"); \
                                continue; \
                            } \
                        }while(0)
  
int main()
{
    int i = 0;
    PRINT(i, 3);
    return 0;
}

How many times GeeksQuiz is printed in the above program ?
(A) 1
(B) 3
(C) 4
(D) Compile-time error


Answer: (A)

Explanation: If a macro needs to be expanded in multiple lines, it is the best practice to write those lines within do{ }while(0) to avoid macro side effects. After GeeksQuiz is printed once, the control reaches the while statement to check for the condition. Since, the condition is false, the loop gets terminated.

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