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C Preprocessor and Macros Tricky 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
11. What will be the output of the C program?
#include<stdio.h>
#define CONDITION(i)\
printf("preprocessor works\n");
int main()
{
CONDITION(0);
return 0;
}
x
Option: C
Explanation
#define CONDITION(i) ends with backslash(/). So that next line following #define CONDITION(i) will be consider by the C compiler and prints preprocessor works
12. What will be the output of the C program?
#include<stdio.h>
# define loop while(true)
int main()
{
loop;
printf("preprocessor-aptitude");
return 0;
}
x
Option: A
Explanation
Program never ends and no output will be printed as infinite execution starts for loop; itself.
13. What will be the output of the C program?
#include<stdio.h>
# define x - -5
int main()
{
printf("%d",x);
return 0;
}
x
Option: D
Explanation
.
14. What will be the output of the C program?
#include<stdio.h>
# define x --5
int main()
{
printf("%d",x);
return 0;
}
x
Option: B
Explanation
We cannot decrement or increment the value directly . Thus compilation error occurs.
15. What will be the output of the C program ?
#include<stdio.h>
#define sqr(x) ++x * ++x
int main()
{
int a = 3, z;
z = ++a * ++a;
a -= 3;
printf("%d %d", sqr(a), z);
return 0;
}
x
Option: C
Explanation
Line 6: a = 3 .
Line 7: z = 4 * ++a.
Line 7: z = 4 * 5.
Line 7: z = 5 * 5.
Line 7: z = 25.
Line 8: a = 5 - 3.
Line 8: a = 2.
Line 9: here line 2 will execute .
Line 2: #define sqr(2) 3 * 4.
Line 2: #define sqr(2) 4 * 4.
Line 2: #define sqr(2) 16.
Now 16 25will be printed as per our printf() function.
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