Macro Substitution Quiz Online Practice Test

1. What will the following C code produce as output?
#include <stdio.h>
#define foo(m, n) m ## n
int main()
{
printf("%s\n", foo(k, l));
}

2. What does the following C code print as output?
#include <stdio.h>
#define foo(m, n) " m ## n "
int main()
{
printf("%s\n", foo(k, l));
}

3. What is the output of this C code?
#include <stdio.h>
#define foo(x, y) #x #y
int main()
{
printf("%s\n", foo(k, l));
return 0;
}

4. What is the output of the following C code?
#include <stdio.h>
#define foo(x, y) x / y + x
int main()
{
int i = -6, j = 3;
printf("%d\n", foo(i + j, 3));
return 0;
}

5. What will this C code output?
#include <stdio.h>
void f();
int main()
{
#define foo(x, y) x / y + x
f();
}
void f()
{
printf("%d\n", foo(-3, 3));
}

6. What will this C code output?
#include <stdio.h>
void f();
int main()
{
#define max 10
f();
return 0;
}
void f()
{
printf("%d\n", max * 10);
}

7. What is the output of this C code?
#include <stdio.h>
#define foo(x, y) x / y + x
int main()
{
int i = -6, j = 3;
printf("%d ", foo(i + j, 3));
printf("%d\n", foo(-3, 3));
return 0;
}

8. What is the output of this C code?
#include <stdio.h>
int foo(int, int);
#define foo(x, y) x / y + x
int main()
{
int i = -6, j = 3;
printf("%d ", foo(i + j, 3));
#undef foo
printf("%d\n", foo(i + j, 3));
}
int foo(int x, int y)
{
return x / y + x;
}

9. What is the advantage of using #define over const?

10. What will this C code output?
#include <stdio.h>
void main()
{
#define max 37;
printf("%d", max);
}

11. What is the output of this C code?
#include <stdio.h>
void main()
{
#define max 37
printf("%d", max);
}

12. What is the output of this C code?
#include <stdio.h>
void main()
{
#define const int
const max = 32;
printf("%d", max);
}

13. What will this C code output?
#include <stdio.h>
void main()
{
#define max 45
max = 32;
printf("%d", max);
}

14. What will this C code output?
#include <stdio.h>
# define max
void m()
{
printf("hi");
}
void main()
{
max;
m();
}

15. What is the output of this C code?
#include <stdio.h>
#define A 1 + 2
#define B 3 + 4
int main()
{
int var = A * B;
printf("%d\n", var);
}

16. What can be said about the output of this C code?
#include <stdio.h>
#define var 20);
int main()
{
printf("%d\n", var
}

17. Which of the following properties of #define is not true?