C++ Basic Programs For Beginners

7 min read Jul 01, 2024

C++ Basic Programs for Beginners

C++ is a powerful and versatile programming language widely used in various fields, from game development to system programming. Learning C++ can be a challenging but rewarding experience, and starting with basic programs is an excellent way to grasp the fundamental concepts.

Here are some basic C++ programs for beginners to get started:

1. Hello World!

The "Hello World!" program is a classic tradition in programming. It's a simple program that prints the message "Hello World!" on the screen.

#include 

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

Explanation:

#include <iostream>: This line includes the input/output stream library, which provides the functionality to print text on the screen.
int main(): This is the main function where the program execution begins.
std::cout: This object is used to output text to the console.
<<: This operator inserts data into the output stream.
"Hello World!": This is the string that will be printed.
std::endl: This inserts a newline character, moving the cursor to the next line.
return 0: This indicates that the program has executed successfully.

2. Taking Input from the User

This program demonstrates how to take input from the user and display it back to them.

#include 

int main() {
  std::string name;
  std::cout << "Enter your name: ";
  std::cin >> name;
  std::cout << "Hello " << name << "!" << std::endl;
  return 0;
}

Explanation:

std::string name: This declares a string variable named 'name' to store the user's input.
std::cin: This object is used to read input from the console.
>>: This operator extracts data from the input stream.
std::cout << "Enter your name: ";: This line prompts the user to enter their name.
std::cin >> name: This line reads the user's input and stores it in the 'name' variable.
std::cout << "Hello " << name << "!" << std::endl: This line prints the greeting message along with the user's name.

3. Calculating the Area of a Triangle

This program demonstrates how to perform basic calculations using C++.

#include 

int main() {
  double base, height, area;
  std::cout << "Enter the base of the triangle: ";
  std::cin >> base;
  std::cout << "Enter the height of the triangle: ";
  std::cin >> height;
  area = 0.5 * base * height;
  std::cout << "The area of the triangle is: " << area << std::endl;
  return 0;
}

Explanation:

double base, height, area: This declares three double-precision floating-point variables to store the base, height, and area of the triangle.
std::cout << "Enter the base of the triangle: ";: This prompts the user to enter the base of the triangle.
std::cin >> base: This reads the user's input for the base and stores it in the 'base' variable.
std::cout << "Enter the height of the triangle: ";: This prompts the user to enter the height of the triangle.
std::cin >> height: This reads the user's input for the height and stores it in the 'height' variable.
area = 0.5 * base * height: This calculates the area of the triangle using the formula: area = 0.5 * base * height.
std::cout << "The area of the triangle is: " << area << std::endl: This prints the calculated area of the triangle.

4. Checking if a Number is Even or Odd

This program demonstrates the use of conditional statements in C++.

#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:

int number: This declares an integer variable named 'number' to store the user's input.
std::cout << "Enter a number: ";: This prompts the user to enter a number.
std::cin >> number: This reads the user's input and stores it in the 'number' variable.
if (number % 2 == 0): This checks if the remainder when the number is divided by 2 is equal to 0. If true, the number is even.
std::cout << number << " is even." << std::endl: This prints a message indicating that the number is even.
else: This block is executed if the number is not even (i.e., odd).
std::cout << number << " is odd." << std::endl: This prints a message indicating that the number is odd.

These are just a few simple examples to get you started with C++. By understanding these basics, you can build upon them to create more complex and sophisticated programs. Remember to practice regularly and experiment with different concepts to solidify your understanding of C++.

C++ Basic Programs For Beginners