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C Preprocessor and Macros Interview Questions
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
21. What will be the output of the C program?
#include<stdio.h>
int main()
{
printf("Line :%d\n", __LINE__ );
return 0;
}
x
Option: D
Explanation
__LINE__ macro will print the number of lines from start to the statement containing __LINE__ thus outputted 4.
22. What will be the output of the C program?
#include<stdio.h>
#define preprocessor_works(x, y) \
printf(#x " and " #y " are great!\n")
int main(void) {
preprocessor_works(you, me);
return 0;
}
x
Option: A
Explanation
# is know as Stringize or number-sign.
When # is used within a macro definition, # macro converts a macro parameter into a string constant.
When we are passing any special arguments or string as a parameter value, then # macrons are get used.
23. What will be the output of the C program?
#include<stdio.h>
# define puts "%s C preprocessor"
int main()
{
printf(puts, puts);
return 0;
}
C. %s C preprocessor %s C preprocessor✘
D. %s C preprocessor C preprocessor✔
x
Option: D
Explanation
printf(puts,puts); will call the preprocessor macro # define puts.
printf("%s C preprocessor","%s C preprocessor");
printf(%s C preprocessor C preprocessor);
24. What will be the output of the C program?
#include<stdio.h>
#define preprocessor(n) printf ("macro" #n " = %d", macro##n)
int main(void) {
int macro25 = 47;
preprocessor(25);
return 0;
}
x
Option: B
Explanation
## is nothing more than concatenation operator.
25. What will be the output of the C program ?
#include<stdio.h>
#include<string.h>
#define MACRO(num) ++num
int main()
{
char *ptr = "preprocessor";
int num =strlen(ptr);
printf("%s ", MACRO(ptr));
printf("%d", MACRO(num));
return 0;
}
x
Option: C
Explanation
int num = strlen(ptr);
int num = 12;
printf("%s", MACRO(preprocessor));
printf("%s", reprocessor);
printf("%d", MACRO(num));
printf("%d", 13);
Thus output is reprocessor 13
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