C Objective Questions for Practitioners

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Question: 51

#define x 10
#define x 20
#include <stdio.h>

int main()
{
    printf("%d", x);
    return 0;
}

(A) 10
(B) 20
(C) 0
(D) Compilation Error

Compiler
Level: Practitioner Category of MCQ: macros

Question: 52

#define x 10;
#define x 20;
#include <stdio.h>

int main()
{
    printf("%d", x);
    return 0;
}

(A) 10
(B) 20
(C) 0
(D) Compilation Error

Compiler
Level: Practitioner Category of MCQ: macros

Question: 53

#define x 10

int main()
{
    printf("%d %c", x);
    return 0;
}

(A) 10 Garbage
(B) Garpage 10
(C) 10 0
(D) Compilation Error

Compiler
Level: Practitioner Category of MCQ: macros

Question: 54

#define x 65

int main()
{
    printf("%d %c", x, x);
    return 0;
}

(A) 65
(B) 65 65
(C) 65 a
(D) 65 A

Compiler
Level: Practitioner Category of MCQ: macros

Question: 55

#define x 65

int main()
{
    printf("%d", x+5+x/5);
    return 0;
}

(A) 27
(B) 79
(C) 83
(D) 0

Compiler
Level: Practitioner Category of MCQ: macros

Question: 56

//Note: this is compiled on gcc
#include <stdio.h>

int main()
{
int a = 1;
printf("%d %d %d", a, ++a, a++);
return 0;
}

(A) 1 2 2
(B) 1 3 3
(C) 3 3 1
(D) 1 3 2

Compiler
Level: Practitioner Category of MCQ: variables

Question: 57

#include <stdio.h>

int main()
{

int i, j = 10, k=12;
i = printf("Hello");

printf("%d", i);
i = printf("%d", i);

printf("%d", i);
i=printf("%d %d %d", i, j, k);

printf("%d", i);

return 0;
}

(A) Hello 0 0 0 10 12 0
(B) Hello 5 5 1 10 12 3
(C) Hello 6 6 6 10 12 3
(D) Hello 6 6 2 2 10 12 8

Compiler
Level: Practitioner Category of MCQ: variables

Question: 58

#include "stdio.h"

int main()
{
int x = 50;
int y = 60;

printf("%d %d", x++, y--);
printf("#%d %d", ++x, --y);

return 0;
}

(A) 50 69#51 59
(B) 50 60#52 58
(C) 50 60#51 59
(D) 50 59#51 60

Compiler
Level: Practitioner Category of MCQ: variables

Question: 59

#include <iostream>
using namespace std;
main()
{
	double a = 21.09;
	float b = 10.30;
	int c ,d;
	c = (int) a;
	d = (int) b;
	cout << c <<'*'<< d;
	return 0;
}

(A) 2100
(B) 217.227
(C) 21*10
(D) 22*11

Compiler
Level: Practitioner Category of MCQ: operators

Question: 60

#include <iostream>
using namespace std;
  
int main()
{
    int i, j;
    j = 10;
    i = (j++, j++, j++);
    cout<<i;
    return 0;
}

(A) 0
(B) Compilation Error
(C) 12
(D) 10

Compiler
Level: Practitioner Category of MCQ: operators

Question: 61

#include <stdio.h>
#include <string.h>

int main()
{
struct xyz{
    char * n;
    int eos;
};

struct xyz x = {"cppbuzz", 2017};
struct xyz y=x;
printf("%d", printf("%s",y.n));

return 0;
}

(A) cppbuzz
(B) 7cppbuzz
(C) 8cppbuzz
(D) cppbuzz7

Compiler
Level: Practitioner Category of MCQ: structure

Question: 62

#include "stdio.h"
#include "string.h"

int main()
{
struct xyz{
   char * n;
   int eos;
};

struct xyz x = {"cppbuzz", 2017};
struct xyz y=x;
printf(printf("%s",y.n), printf("%s",y.n));

return 0;
}

(A) cppbuzz
(B) cppbuzzcppbuzz
(C) cppbuzz7
(D) None of the above

Compiler
Level: Practitioner Category of MCQ: structure

Question: 63

Is it necessary that all elements of structure should be different in size?

(A) Yes
(B) No

Compiler
Level: Practitioner Category of MCQ: structure

Question: 64

Can we use access specifiers(private, public, protected) with structures?

(A) Yes
(B) No

Compiler
Level: Practitioner Category of MCQ: structure

Question: 65

Is it mandatory that the size of all elements in a union should be same?

(A) Yes
(B) No

Compiler
Level: Practitioner Category of MCQ: union

Question: 66

#include <stdio.h>

int main()
{
struct xyz{
int a;
};

struct xyz obj1={1};
struct xyz obj2 = obj1;
printf("%d", obj2.a);
obj2.a = 100;
printf("%d", obj1.a);
return 0;
}

(A) 1100
(B) 11
(C) 0100
(D) 10

Compiler
Level: Practitioner Category of MCQ: structure

Question: 67

The output of Assembler in process of compilation is

(A) Assembly Code
(B) Object Code
(C) Executable
(D) .i file

Compiler
Level: Practitioner Category of MCQ: assembler

Question: 68

#include <stdio.h>

void decrement();

int main()
{
decrement();
decrement();
decrement();
return 0;
}

void decrement()
{
 static int i = 5;
 printf("%d",i);
 i--;
}

(A) 555
(B) 543
(C) 545
(D) 544

Compiler
Level: Practitioner Category of MCQ: function

Question: 69

#include <stdio.h>

int main()
{
printf("%d",printf("HELLO"));

return 0;

}

(A) Compilation Error
(B) Hello
(C) 5Hello
(D) Hello5

Compiler
Level: Practitioner Category of MCQ: function

Question: 70

Which of the following are valid statements regarding the ANSI C pointer ptr below?

struct descriptor desc;
struct descriptor const *ptr = &desc;

(A) ptr must refer to desc
(B) ptr may point to any descriptor elsewhere in memory
(C) Incrementing ptr will cause misalignment between ptr and desc
(D) desc may be modified through ptr

Compiler
Level: Practitioner Category of MCQ: pointers

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