C Concepts: Basic Knowledge Test

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Single answer

What is the correct way to include the standard input/output library in a C program?

#include <stdio.h> #include "stdio.h" import stdio using stdio;

Single answer

Which of the following is the correct way to declare an integer variable named count?

def count; var count; int count; int: count;

Single answer

Which data type is used to store a single character in C?

double float int char

Multiple answers

How do you write a comment in C?

# This is a comment  // This is a comment /* This is a comment */

Single answer

What is the purpose of the main() function in a C program?

It contains all the program code It is used to include libraries It is the entry point of the program It is optional in C programs

Single answer

What does the %d format specifier do in a printf() statement?

Displays a floating-point number Displays an integer value Displays a character Displays a string

Single answer

Which of the following is true about the return statement in the main() function?

It only works inside loops It is optional and does nothing if omitted It restarts the program It terminates the program and returns a status code to the operating system

Multiple answers

Which of these are valid ways to initialize an array of integers with 5 elements in C? (Choose all that apply)

int arr[5] = {1, 2, 3, 4, 5}; int arr[5]; int arr[] = {1, 2, 3, 4, 5} int arr[5] = {0};

Single answer

What is the primary purpose of the #include directive in a C program?

To include external libraries or header files To define a new function To initialize variables To compile the program

Single answer

Which operator is used for the modulus operation in C?

# % ^ &