Fundamentals of Data Structure MCQ's Set-2

 

1] What is the difference between the following 2 codes? 

 //Program 1

#include <stdio.h> 

int main() 

 { 

         int d, a = 1, b = 2; 

         d = a++ + ++b; 

         printf("%d %d %d", d, a, b); 

 } 

 //Program 2

#include <stdio.h> 

int main() 

 { 

         int d, a = 1, b = 2;

         d = a++ + ++b; 

         printf("%d %d %d", d, a, b); 

 } 

a) No difference as space doesn’t make any difference, values of a, b, d are same in both the case

b) No difference as space doesn’t make any difference, values of a, b, d are different 

c) Program 1 has syntax error, program 2 is not 

d) Program 2 has syntax error, program 1 is not

ANSWER : A

2] What is the output of this C code? 

 #include <stdio.h>   

 int main() 

 { 

         int a = 1, b = 1, c; 

         c = a++ + b; 

         printf("%d, %d", a, b); 

 } 

a) a = 1, b = 1 

b) a = 2, b = 1 

c) a = 1, b = 2 

d) a = 2, b = 2

ANSWER : B

3] What is the output of this C code? 

#include <stdio.h>  

int main() 

 { 

     int a = 1, b = 1, d = 1;

     printf("%d, %d, %d", ++a + ++a+a++, a++ + ++b, ++d + d++ + a++); 

 } 

a) 15, 4, 5 

b) 9, 6, 9 

c) 9, 3, 5 

d) 6, 4, 6

ANSWER : A

4] For which of the following, “PI++;” code will fail? 

a) #define PI 3.14 

b) char *PI = “A”; 

c) float PI = 3.14; 

d) Both (A) and (B) 

ANSWER : A

5] What is the output of this C code? 

 #include <stdio.h> 

int main() 

 { 

     int a = 10, b = 10; 

     if (a = 5) b--; 

     printf("%d, %d", a, b--); 

 } 

a) a = 10, b = 9 

b) a = 10, b = 8 

c) a = 5, b = 9 

d) a = 5, b = 8

ANSWER : C

6] What is the output of this C code? 

#include <stdio.h> 

int main() 

 {

     int i = 0; 

     int j = i++ + i; 

     printf("%d\n", j); 

 } 

a) 0 

b) 1 

c) 2 

d) Compile time error

ANSWER : A

7] What is the output of this C code? 

 #include <stdio.h> 

int main() 

 {

     int i = 2; 

     int j = ++i + i; 

     printf("%d\n", j); 

 } 

a) 6 

b) 5 

c) 4 

d) Compile time error

ANSWER : A

8] Comment on the output of this C code? 

#include <stdio.h> 

int main() 

{ 

     int i = 2; 

     int i = i++ + i; 

     printf("%d\n", i); 

 } 

a) = operator is not a sequence point 

b) ++ operator may return value with or without side effects 

c) it can be evaluated as (i++)+i or i+(++i) 

d) Both a and b 

ANSWER : A

9] #include is also called as ______ 

a) Preprocessor directive

 b) Inclusion directive 

c) File inclusion directive 

d) None of the mentioned

ANSWER : A

10] C preprocessors can have compiler specific features. 

a) true 

b) false 

c) Depends on the standard 

d) Depends on the platform

ANSWER : A

11] C preprocessor is conceptually the first step during compilation 

a) true 

b) false 

c) Depends on the compiler 

d) Depends on the standard

ANSWER : A

12] Preprocessor feature that supply line numbers and filenames to compiler is called? 

a) Selective inclusion 

b) macro substitution 

c) Concatenation 

d) Line control

ANSWER : D

13] A preprocessor is a program 

a) That processes its input data to produce output that is used as input to another program 

b) That is nothing but a loader 

c) That links various source files 

d) All of the mentioned

ANSWER : A

14] The sequence of allocation and deletion of variables for the following code is. 

 #include <stdio.h>   

 int main() 

 { 
      int a; 

         { 

             int b; 

         } 
 } 

a) a->b, a->b 

b) a->b, b->a 

c) b->a, a->b 

d) b->a, b->a

ANSWER : B

15] What is the output of this C code?

#include <stdio.h> 

void main() 

 { 

     int x = 3; 

         { 

             x = 4; 

             printf("%d", x); 

         } 

 } 

a) 4 

b) 3 

c) 0 

d) Undefined

ANSWER : A

16] What is the output of this C code? 

 #include <stdio.h>   

 int x = 5; 

 void main() 

 { 

     int x = 3; 

     m(); 

     printf("%d", x); 

 } 

 void m() 

 { 

     x = 8; 

     n(); 

 } 

 void n() 

 { 

     printf("%d", x); 

 } 

a) 5 3 

b) 3 8 

c) 8 5 

d) 8 3 

ANSWER : D

17] What is the output of this C code? 

 #include<stdio.h>  
 int x; 

 void main() 

 { 

     m(); 

     printf("%d", x); 

 } 

 void m() 

 { 

     x = 4; 

 } 

a) 0 

b) 4 

c) Compile time error 

d) Undefined

ANSWER : B

18] What is the output of this C code? 

 #include<stdio.h>  

 static int x = 5; 

 void main() 

 { 

     int x = 9; 

         {

                x = 4; 

         } 

   printf("%d", x); 

 } 

a) 9 

b) 5 

c) 4 

d) 0

ANSWER : C

19] What is the output of this C code? 

 #include<stdio.h>   

void main() 

 { 

     {

         int x = 8; 

     } 

   printf("%d", x); 

 }

a) 8 

b) 0 

c) Undefined 

d) Compile time error

ANSWER : D

20] What is the output of this C code? 

#include<stdio.h> 

void main() 

 { 

     int x = 1, y = 0, z = 5;

     int a = x && y || z++; 

     printf("%d", z); 

 } 

a) 6 

b) 5 

c) 0 

d) Varies

ANSWER : A