IndiaBIX

C Programming - C Preprocessor

Exercise : C Preprocessor - Yes / No Questions
1.
Will the program compile successfully? 
#include<stdio.h>
#define X (4+Y)
#define Y (X+3)

int main()
{
    printf("%d\n", 4*X+2);
    return 0;
}
Yes
No
Answer: Option
Explanation:
Reports an error: Undefined symbol 'X'
2.
Would the following typedef work?
typedef #include l;
Yes
No
Answer: Option
Explanation:
Because typedef goes to work after preprocessing.
3.
Will the program compile successfully? 
#include<stdio.h>

int main()
{
    printf("India" "BIX\n");
    return 0;
}
Yes
No
Answer: Option
Explanation:
Yes, It prints "IndiaBIX"
4.
It is necessary that a header files should have a .h extension?
Yes
No
Answer: Option
Explanation:

No, the header files have any kind of extension.

5.
Will the program compile successfully? 
#include<stdio.h>

int main()
{
    #ifdef NOTE
        int a;
        a=10;
    #else
        int a;
        a=20;
    #endif
    printf("%d\n", a);
    return 0;
}
Yes
No
Answer: Option
Explanation:

Yes, this program will compile and run successfully and prints 20.

The macro #ifdef NOTE evaluates the given expression to 1. If satisfied it executes the #ifdef block statements. Here #ifdef condition fails because the Macro NOTE is nowhere declared.

Hence the #else block gets executed, the variable a is declared and assigned a value of 20.

printf("%d\n", a); It prints the value of variable a 20.

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