20 C++ MCQ Questions and Answers

C++ MCQ Questions and Answers: C++ is one of the most important and popular languages in computer programming. It can produce highly efficient codes that show high performance.

Due to their extreme importance, students need to practice C++ MCQ Questions and Answers to clear various exams.

Hence, in this article, we provide you with 20 C++ MCQ Questions and Answers. The Answers to the 20 C++ MCQ Questions and Answers are given at the end.

C++ MCQ Questions and Answers

A list of C++ MCQ Questions and Answers are as follows

Which of the following section tells the compiler to link certain occurrences of keywords or functions in a program to header files specified in this section

(a) Main Function Section

(b) Definition Section

(d) Documentation Section

Which of the following is the correct range of “Floating Point Data Type”?

(a) -32,768 to 32,767

(b) -128 to 127

(d) 0 to 65535

Which of the following is not a C Token?

(a) Keyword

(b) Pointer

(d) Operators

Which of the following Statements is incorrect?

(a) An integer value with base 10 is called a decimal integer

(b) Real constants are also known as floating-point constants

(d) Real Constants have only decimal parts and no fraction part

Which of the following statement is incorrect about Variables?

(a) A variable is an identifier

(b) Variables can be changed during the execution of the program

(d) Existing keywords, operators, separators, and constants values are allowed in variable declaration

Which of the following is incorrect?

(a) Variables which are defined inside a function are called Local Variables

(b) Variables which are defined outside of any function are Global Variables

(d) Constant variables are only at Local Level.

Which of the following are used to place library information in a program?

(a) Preprocessor Commands

(b) Constant Variable

(d) Local Variable

In which of the following we test to see whether or not to continue before executing the body of the loop?

(a) Pretest Loop

(b) Mid Test Loop

(d) No Test Loop

Consider the Program below

#include<stdio.h>

#include<conio.h>

void main()

{

int i,j,n,f;

clrscr();

printf(“enter a value=”);

scanf(“%d”,&n);

i=0;

j=1;

printf(“%d\t%d”,i,j);

f=i+j;

while(f<=n)

{

printf(“\t %d”,f);

i=j;

j=f;

f=i+j;

}

getch();

}

Which of the following series will the above program return?

(a) Sum of n numbers

(b) Fibonacci Series

(d) Sum of square of n numbers

To access any member of a union, which of the following operator is used?

(a) :

(b) .

(d) +

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Which of the following is not matched correctly?

(a) w – Opens or Creates a text file in Writing Mode

(b) r+ – Opens a text file in both Reading and Writing Mode

(d) w+ – Opens a text file in Append Mode

Consider the following Program

“#include<stdio.h>

void main()

{

FILE *fp;

char ch;

fp = fopen(“one.txt”, “w”);

printf(“Enter data…”);

while(ch = getchar()) != EOF)

{

putc(ch, fp);

}

fclose(fp);

fp = fopen(“one.txt”, “r”);

while( (ch = getc(fp)! = EOF)

printf(“%c”,ch);

// closing the file pointer

fclose(fp);

}

The Above program prints

(a) Contents entered in file one.txt

(b) Only integers from file one.txt

(d) None of the above

	Data Type	Default value if not initialized
1	Integer	0
2	Float	0.00
3	Char	NULL

Which of the above is correctly matched

(a) Only 2

(b) 1 and 2

(d) 1,2 and 3

Which of the following are derived types in C:

1) Function types

2) Pointer types

3) Integer types

4) Structure types

5) Union types

(a) 1,2, and 3

(b) 1, 3 and 5

(d) 1,2,3 and 4

Which of the following is false regarding the Enumerated Data Type?

(a) It is mainly used to assign names to integral constants.

(b) If values are not assigned to enum, the compiler by default assigns values starting from 1

(d) All enum constants must be unique in their scope

Consider the two statements below

Statement 1 – The malloc() function allocates memory and leaves the memory uninitialized.

Statement 2 – The calloc() function allocates memory and initializes all bits to one.

Choose the appropriate option below

(a) Statement 1 and Statement 2 are Correct

(b) Statement 1 is Correct but Statement 2 is Incorrect