C++ - Beginner’s Exercise

Beginner's Exercises for C++

Introduction

These 10 C++ exercises are designed to help beginners practice the basic concepts of C++ programming. They cover topics such as variables, data types, loops, conditionals, functions, and arrays. Completing these exercises will provide a solid foundation for learning more advanced topics in C++.

Exercise 1: Hello, World!

Write a program that outputs "Hello, World!" to the console.

Code Example

#include 
using namespace std;

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

This is the simplest C++ program that prints a message to the screen using the cout statement.

Exercise 2: Input and Output

Write a program that takes user input for their name and age and outputs a greeting message with their name and age.

Code Example

#include 
using namespace std;

int main() {
    string name;
    int age;
    cout << "Enter your name: ";
    cin >> name;
    cout << "Enter your age: ";
    cin >> age;
    cout << "Hello " << name << ", you are " << age << " years old." << endl;
    return 0;
}
    

Exercise 3: Basic Arithmetic Operations

Write a program that asks the user for two numbers and performs addition, subtraction, multiplication, and division.

Code Example

#include 
using namespace std;

int main() {
    double num1, num2;
    cout << "Enter first number: ";
    cin >> num1;
    cout << "Enter second number: ";
    cin >> num2;
    cout << "Addition: " << num1 + num2 << endl;
    cout << "Subtraction: " << num1 - num2 << endl;
    cout << "Multiplication: " << num1 * num2 << endl;
    cout << "Division: " << num1 / num2 << endl;
    return 0;
}
    

Exercise 4: Even or Odd

Write a program that takes an integer as input and checks whether it is even or odd.

Code Example

#include 
using namespace std;

int main() {
    int num;
    cout << "Enter an integer: ";
    cin >> num;
    if (num % 2 == 0) {
        cout << num << " is even." << endl;
    } else {
        cout << num << " is odd." << endl;
    }
    return 0;
}
    

Exercise 5: Temperature Converter

Write a program that converts temperature from Celsius to Fahrenheit and vice versa.

Code Example

#include 
using namespace std;

int main() {
    double celsius, fahrenheit;
    cout << "Enter temperature in Celsius: ";
    cin >> celsius;
    fahrenheit = (celsius * 9/5) + 32;
    cout << celsius << " Celsius is equal to " << fahrenheit << " Fahrenheit." << endl;
    return 0;
}
    

Exercise 6: Factorial

Write a program that calculates the factorial of a given number using a loop.

Code Example

#include 
using namespace std;

int main() {
    int num;
    long long factorial = 1;
    cout << "Enter a number: ";
    cin >> num;
    for (int i = 1; i <= num; ++i) {
        factorial *= i;
    }
    cout << "Factorial of " << num << " is " << factorial << endl;
    return 0;
}
    

Exercise 7: Fibonacci Series

Write a program that prints the Fibonacci series up to a given number.

Code Example

#include 
using namespace std;

int main() {
    int n;
    cout << "Enter the number of terms in Fibonacci sequence: ";
    cin >> n;
    int t1 = 0, t2 = 1, nextTerm;
    cout << "Fibonacci Series: ";
    for (int i = 1; i <= n; ++i) {
        if (i == 1) {
            cout << t1 << ", ";
            continue;
        }
        if (i == 2) {
            cout << t2 << ", ";
            continue;
        }
        nextTerm = t1 + t2;
        t1 = t2;
        t2 = nextTerm;
        cout << nextTerm << ", ";
    }
    cout << endl;
    return 0;
}
    

Exercise 8: Prime Number Check

Write a program that checks if a given number is prime or not.

Code Example

#include 
using namespace std;

int main() {
    int num;
    bool prime = true;
    cout << "Enter a number: ";
    cin >> num;
    for (int i = 2; i <= num / 2; ++i) {
        if (num % i == 0) {
            prime = false;
            break;
        }
    }
    if (prime)
        cout << num << " is a prime number." << endl;
    else
        cout << num << " is not a prime number." << endl;
    return 0;
}
    

Exercise 9: Sum of Digits

Write a program that takes an integer as input and calculates the sum of its digits.

Code Example

#include 
using namespace std;

int main() {
    int num, sum = 0;
    cout << "Enter a number: ";
    cin >> num;
    while (num != 0) {
        sum += num % 10;
        num /= 10;
    }
    cout << "Sum of digits is: " << sum << endl;
    return 0;
}
    

Exercise 10: Reverse a Number

Write a program that reverses a given number.

Code Example

#include 
using namespace std;

int main() {
    int num, reversed = 0;
    cout << "Enter a number: ";
    cin >> num;
    while (num != 0) {
        reversed = reversed * 10 + num % 10;
        num /= 10;
    }
    cout << "Reversed number: " << reversed << endl;
    return 0;
}
    

These 10 exercises cover the basics of C++ programming and will help beginners understand how to work with variables, loops, conditionals, functions, and arrays. As you solve these exercises, you will get more comfortable with C++ syntax and concepts. The key to mastering C++ is consistent practice and exploring new problems.