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C Preprocessor Questions

NA
SHSTTON
168
Solv. Corr.
88
Solv. In. Corr.
256
Attempted
0 M:0 S
Avg. Time

1 / 34

What will be output of the following "c" code?
#include<stdio.h>
#define  max(a,b)  (a>b)? a:b
int  main()
{
int a,b; a=3; b=4;
printf("%d",max(a,b));
return 0;
}

A3

B4

C12

D0

ECompilation Error

Answer: Option B

Explanation:

Since, using directive statement the valus of a is less than b which is false condition in the ternery statement results to B value.

Workspace

NA
SHSTTON
28
Solv. Corr.
27
Solv. In. Corr.
55
Attempted
0 M:0 S
Avg. Time

2 / 34

What will be output of the following "c" code?
#include<stdio.h>
#define clrscr() 100 
main()
{
clrscr();
printf("%d\n",clrscr());
}

AGarbage Value

BBlank

C100

DCompilation error

ENone of these

Answer: Option C

Explanation:

Preprocessor executes as a seperate pass before the execution of the
compiler. So textual replacement of clrscr() to 100 occurs.

Workspace

NA
SHSTTON
10
Solv. Corr.
41
Solv. In. Corr.
51
Attempted
0 M:0 S
Avg. Time

3 / 34

What will be output of the following "c" code?
#include<stdio.h>
#define int char 
void main()
{
int i=65;
printf("sizeof(i)=%d",sizeof(i));
}

Asizeof(i)=2

Bsizeof(i)=1

Csizeof(i)=4

DCompilation error

ENone of these

Answer: Option B

Explanation:

The #define replaces the string int by the macro char

Workspace

NA
SHSTTON
27
Solv. Corr.
26
Solv. In. Corr.
53
Attempted
0 M:0 S
Avg. Time

4 / 34

What will be output of the following "c" code?
#include<stdio.h>
#define a 10 
void main()
{
#define a 50 
printf("%d",a);
}

AGarbage Value

BCompilation error

C50

DNone of these

Answer: Option C

Explanation:

The preprocessor directives can be redefined anywhere in the program. So the most recently assigned value will be taken.

Workspace

NA
SHSTTON
12
Solv. Corr.
38
Solv. In. Corr.
50
Attempted
0 M:0 S
Avg. Time

5 / 34

What will be output of the following "c" code?
#include<stdio.h>
#define square(x) x*x 
void main()
{
int i;
i = 64/square(4); 
printf("%d",i);
}

A64

B4

CCompilation error

DNone of these

Answer: Option A

Explanation:

Pre-processor will substitute square(4) by 4*4
so the expression becomes I = 64/4*4 .
Since / and * has equal priority the expression will be evaluated as (64/4)*4 => 16*4 = 64

Workspace

NA
SHSTTON
17
Solv. Corr.
26
Solv. In. Corr.
43
Attempted
0 M:0 S
Avg. Time

6 / 34

What will be output of the following "c" code?
#include<stdio.h>
#define FALSE -1
#define TRUE  1
#define NULL  0 
int main() {
if(NULL)
puts("NULL");
else if(FALSE)
puts("TRUE"); 
else
puts("FALSE");
}

AFALSE

BTRUE

CCompilation error

DNone of these

Answer: Option B

Explanation:

Preprocessor doesn't replace the values given inside the double quotes. The check by if condition is boolean value false so it goes to else. In second if -1 is boolean value true hence "TRUE" is printed.

Workspace

NA
SHSTTON
22
Solv. Corr.
16
Solv. In. Corr.
38
Attempted
0 M:0 S
Avg. Time

7 / 34

What will be output of the following "c" code?
#include<stdio.h>
#define f(g,g2) g##g2 
int main()
{
int var12=100;
printf("%d",f(var,12));
return 0;
}

A10

B100

CGarbage Value

DCompilation error

Answer: Option B

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
14
Solv. Corr.
23
Solv. In. Corr.
37
Attempted
0 M:0 S
Avg. Time

8 / 34

What will be output of the following "c" code?
#include<stdio.h>
#define prod(a,b) a*b
void main()
{
int x=3,y=4;
printf("%d",prod(x+2,y-1));
}

A10

B12

C19

D9

ENone of these

Answer: Option A

Explanation:

The macro expands and evaluates to as:
x+2*y-1
=> x+(2*y)-1
=> 3+(2*4)-1 => 10

Workspace

NA
SHSTTON
14
Solv. Corr.
20
Solv. In. Corr.
34
Attempted
0 M:0 S
Avg. Time

9 / 34

What will be output of the following "c" code?
#include<stdio.h>
#ifdef something 
int some=0;
#endif
void main()
{
int thing = 0;
printf("%d %d\n", some ,thing); 
}

A0

BGarbage Value

CCompiler error : undefined symbol some

DNone of these

Answer: Option C

Explanation:

This is a very simple example for conditional compilation.
The name something is not already known to the compiler making the declaration int some = 0; effectively removed from the source code.

Workspace

NA
SHSTTON
13
Solv. Corr.
20
Solv. In. Corr.
33
Attempted
2 M:28 S
Avg. Time

10 / 34

What will be output of the following "c" code?
#include<stdio.h>
#if something == 0 
int some=0;
#endif

void main()
{
int thing = 0;
printf("%d %d\n", some ,thing);
}

ACompiler error : undefined symbol some

B0 0

CGarbage Value

DNone of these

Answer: Option B

Explanation:

This code is to show that preprocessor expressions are not the same as the ordinary expressions. If a name is not known the preprocessor treats it to be equal to zero.

Workspace

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