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C Preprocessor and Macros Interview Questions and Answers
In most of the MNC interview questions such as in ZOHO interview question, IVTL Infoview interview questions, Amazon interview questions, GOOGLE interview questions, Infosys interview questions and even in Voonik interview questions, We come across several Tricky C Questions about which 2:5 of the questions are from Preprocessor and Macros in c. Solving that kind of tricky C questions is not an easy task for all C programmers. We need more practices to solve it with ease. So we provide 25+ interesting C questions in Preprocessor and Macros to make your MNC interview very easy.
C Preprocessor and Macros Questions
16. What will be the output of the C program?
#include<stdio.h>
#define x 1+2
int main()
{
int i;
i = x * x * x;
printf("%d",i);
}
x
Option: C
Explanation
i = x * x * x;
i = 1+2 * x * x;
i = 3 * x * x;
i = 3 * 1+2 * x;
i = 3 + 2 * x;
i = 5 * x;
i = 5 * 1 + 2;
i = 5 + 2;
i = 7;
Thus C compiler outputs i = 7
17. What will be the output of the C program?
#include<stdio.h>
#define a =
int main()
{
int num a 6;
printf("%d",num);
return 0;
}
x
Option: A
Explanation
= is defined in proprocessor with the name of a. Thus no problem with a normal compilation flow..
18. What will be the output of the C program?
#include<stdio.h>
#define fun(x,y) x*y
int main()
{
int x = 2, y = 1;
printf("%d",fun(x + 2, y - 1));
return 0;
}
x
Option: D
Explanation
In printf we called the function fun(x + 2, y - 1);.
Now printf looks like this fun(2 + 2, 1 - 1). and control goes to #define preprocessor directive.
fun(2 + 2, 1 - 1) 2 + 2 * 1 - 1
fun(2 + 2, 1 - 1) 2 + 2 - 1
fun(2 + 2, 1 - 1) 4 - 1
fun(2 + 2, 1 - 1) 3
Thus it returns 3 to the printf and outputted.
19. What will be the output of the C program?
#include<stdio.h>
int main()
{
char DATE[15] = "Current Date";
printf("%s\n", __DATE__ );
return 0;
}
x
Option: B
Explanation
__DATE__ is a C macro which print the current date as a character literal in "MMM DD YYYY" format.
20. What will be the output format of the C program ?
#include<stdio.h>
int main()
{
char TIME[15] = "Current Time";
printf("%s\n",__TIME__);
return 0;
}
x
Option: C
Explanation
The current time as a character literal in "HH:MM:SS" format
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