C++ Basic Exercises Practice Solution

6 min read Jul 01, 2024

C++ Basic Exercises: Practice & Solutions

This article provides a collection of basic C++ exercises designed to help beginners solidify their understanding of fundamental concepts. Each exercise comes with a detailed solution, allowing you to compare your approach and learn from different strategies. Let's dive in!

Exercise 1: Hello World!

Objective: Print "Hello World!" to the console.

Solution:

#include 

int main() {
  std::cout << "Hello World!" << std::endl;
  return 0;
}

Explanation:

#include <iostream>: This line includes the input/output stream library, which allows us to interact with the console.
int main() {}: This is the main function, the entry point of every C++ program.
std::cout << "Hello World!" << std::endl;: This line prints the text "Hello World!" to the console using the std::cout object and ends the line with std::endl.

Exercise 2: Variables and Data Types

Objective: Declare variables of different data types and print their values.

Solution:

#include 

int main() {
  int age = 25;
  double height = 1.75;
  char initial = 'A';
  std::string name = "John Doe";

  std::cout << "Age: " << age << std::endl;
  std::cout << "Height: " << height << std::endl;
  std::cout << "Initial: " << initial << std::endl;
  std::cout << "Name: " << name << std::endl;
  return 0;
}

Explanation:

int age = 25;: Declares an integer variable named age and assigns the value 25 to it.
double height = 1.75;: Declares a double-precision floating-point variable named height and assigns the value 1.75 to it.
char initial = 'A';: Declares a character variable named initial and assigns the character 'A' to it.
std::string name = "John Doe";: Declares a string variable named name and assigns the string "John Doe" to it.

Exercise 3: Basic Arithmetic Operations

Objective: Perform basic arithmetic operations (addition, subtraction, multiplication, division) with two integers.

Solution:

#include 

int main() {
  int num1 = 10;
  int num2 = 5;

  int sum = num1 + num2;
  int difference = num1 - num2;
  int product = num1 * num2;
  double quotient = (double) num1 / num2; // Note: Cast to double for floating-point division

  std::cout << "Sum: " << sum << std::endl;
  std::cout << "Difference: " << difference << std::endl;
  std::cout << "Product: " << product << std::endl;
  std::cout << "Quotient: " << quotient << std::endl;
  return 0;
}

Explanation:

int num1 = 10, num2 = 5;: Declares two integer variables and initializes them.
int sum = num1 + num2; ... double quotient = (double) num1 / num2; Performs the arithmetic operations and stores the results in respective variables.
(double) num1 / num2: The cast to (double) ensures a floating-point division even if both operands are integers.

Exercise 4: Conditional Statements

Objective: Write a program that checks if a given number is even or odd.

Solution:

#include 

int main() {
  int number;

  std::cout << "Enter a number: ";
  std::cin >> number;

  if (number % 2 == 0) {
    std::cout << number << " is even." << std::endl;
  } else {
    std::cout << number << " is odd." << std::endl;
  }

  return 0;
}

Explanation:

std::cin >> number;: Reads the input from the console and stores it in the number variable.
if (number % 2 == 0) { ... } else { ... }: This is an if-else statement that checks if the remainder of number divided by 2 is equal to 0. If it is, the number is even; otherwise, it's odd.

Exercise 5: Loops

Objective: Write a program that prints the first 10 natural numbers.

Solution:

#include 

int main() {
  for (int i = 1; i <= 10; i++) {
    std::cout << i << " ";
  }
  std::cout << std::endl;
  return 0;
}

Explanation:

for (int i = 1; i <= 10; i++) { ... }: This is a for loop, which iterates 10 times. The loop variable i is initialized to 1, and in each iteration, it is incremented by 1 until it reaches 10. Inside the loop, the current value of i is printed.

Conclusion

These basic exercises provide a foundation for learning C++. By understanding these concepts and practicing consistently, you can build upon them to tackle more complex problems in the future. Remember to experiment with different variations of these exercises and explore other fundamental concepts in C++ to enhance your programming skills.

C++ Basic Exercises Practice Solution