Quiz about C Macro & Preprocessor

Question 1

C

#include <stdio.h> #define PRINT(i, limit) do \\                         { \\                             if (i++ < limit) \\                             { \\                                 printf("GeeksQuiz\\n"); \\                                 continue; \\                             } \\                         }while(1)  int main() {     PRINT(0, 3);     return 0; }

How many times GeeksQuiz is printed in the above program?

1
3
4
Compile-time error

Discuss it

Question 2

What is the output of following program?

C

#include <stdio.h> #define macro(n, a, i, m) m##a##i##n #define MAIN macro(n, a, i, m)  int MAIN() {     printf("GeeksQuiz");     return 0; }

Compiler Error
GeeksQuiz
MAIN
main

Discuss it

Question 3

C

#include <stdio.h> #define X 3 #if !X     printf("Geeks"); #else     printf("Quiz");   #endif int main() {         return 0; }

Geeks
Quiz
Compiler Error
Runtime Error

Discuss it

Question 4

C

#include <stdio.h> #define ISEQUAL(X, Y) X == Y int main() {     #if ISEQUAL(X, 0)         printf("Geeks");     #else         printf("Quiz");     #endif     return 0; }

Output of the above program?

Geeks
Quiz
Any of Geeks or Quiz
Compile time error

Discuss it

Question 5

C

#include <stdio.h> #define square(x) x*x int main() { int x; x = 36/square(6); printf("%d", x); return 0; }

1
36
0
Compiler Error

Discuss it

Question 6

Output?

C

# include <stdio.h> # define scanf "%s Geeks Quiz " int main() { printf(scanf, scanf); return 0; }

Compiler Error
%s Geeks Quiz
Geeks Quiz
%s Geeks Quiz Geeks Quiz

Discuss it

Question 7

C

#include <stdio.h> #define a 10 int main() { printf("%d ",a); #define a 50 printf("%d ",a); return 0; }

Compiler Error
10 50
50 50
10 10

Discuss it

Question 8

Output?

C

#include<stdio.h>  #define f(g,g2) g##g2  int main()  {     int var12 = 100;     printf("%d", f(var,12));     return 0;  }

100
Compiler Error
0
1

Discuss it

Question 9

Predict the output of following program?

C

#include <stdio.h> #define MAX 1000 int main() { int MAX = 100; printf("%d ", MAX); return 0; }

1000
100
Compiler Error
Garbage Value

Discuss it

Question 10

Output of following C program?

C

#include<stdio.h> #define max abc #define abc 100 int main() { printf("maximum is %d", max); return 0; }

maximum is 100
abcimum is 100
100imum is 100
abcimum is abc

Discuss it