100 Multiple Choice Questions In C Programming – Part 7

November 22, 2021 John Howard

This collection of 100 Multiple Choice Questions and Answers (MCQs) In C Programming : Quizzes & Practice Tests with Answer focuses on “C Programming”.

1. Which of these variable types matches a pointer?

A int

B float *

C long

D char

A pointer is an object (Lvalue) whose value is equal to the address of another object. A pointer is declared by the following instruction:

type *pointer-name;

Where type is the type of the pointed object. This declaration declares an identifier, ‘pointer-name’, associated with an object whose value is the address of another object. The identifier ‘pointer-name’ is an address identifier. As for any Lvalue, its value is modifiable.

2. What is the output of the following C program?

#include <stdio.h>

void main()
{
     float a = 0.2;
     printf("%d, ", a);
     printf("%f", a);
}

A 0, 0.999999

B 0, 0.200000

C Junk value, 0.200000

D 0.200000, junk value

The %d identifier is used for integer numbers, that’s why it displays Junk value.

Output:

-1558040520, 0.200000

3. In which order does the compilation occur?

A Preprocessor – Compiler – Linker

B Compiler – Linker – Preprocessor

C Linker – Preprocessor – Compiler

D Preprocessor – Linker – Compiler

The preprocessor starts the work by replacing each #include directive with the contents of the requested file and by running conditional tests to enable or disable some pieces of code.
The compiler instantiates the templates, executes the constexpr functions, checks the quality of our code and then, in several phases, transforms the C code into an object file.
The linker links several object files to resolve missing symbols and complete the compilation process by generating a working executable.

4. What is the output of the following C program?

#include <stdio.h>

void main()
{
     double a = 14728749.22;
     int b = a;
     printf("%d\n", b);
     printf("%lf\n", b);
}

A 1472874, 0.000000

B 1472874, 1472874.0

C 14728749, 14728749.22

D 0, 0.0

5. What is the output of the following C program?

#include <stdio.h>

void main()
{
     int a = 97;
     char b = a;
     printf("%c\n", b);
}

A 97

B b

C a

D Depends on compiler

The ASCII code for “a” is 97.

6. When a double is converted to a float, its value is _____?

A Rounded

B Truncated

C Depends on compiler

D Depends on the standard

7. What does the following code give: &A ?

A The address of the variable A

B The value of the variable A

C The value of the variable to which A points

D None of the above

&A gives the address of the variable A.

8. What is the output of the following C program?

#include <stdio.h>

int main()
{
     int i = 15;
     char c = -15;
     if (i < c)
         printf("15 < -15\n");
     else
         printf("15 > -15\n");
}

A 15 < -15

B 15 > -15

C Depends on compiler

D Depends on the standard

Whenever you have an operator like (+ – * / % << >> & | ^ == != < <= > >=) between two operands of different types, the two types are converted to a common type before the operation is performed.

9. What does the following code give: *A ?

A The address of the variable A

B The value of the variable A

C The value of the variable to which A points

D None of the above

*A gives the value of the variable to which A points.

10. What is the output of the following C program?

#include <stdio.h>

void main()
{
    int x = 1, y = 0, z = 5;
    int a = x && y || z++;
    printf("%d", z);
}

A 0

B 5

C 6

D Other

z was incremented at line 6.