Book Image

C++ Fundamentals

By : Antonio Mallia, Francesco Zoffoli
Book Image

C++ Fundamentals

By: Antonio Mallia, Francesco Zoffoli

Overview of this book

C++ Fundamentals begins by introducing you to the C++ compilation model and syntax. You will then study data types, variable declaration, scope, and control flow statements. With the help of this book, you'll be able to compile fully working C++ code and understand how variables, references, and pointers can be used to manipulate the state of the program. Next, you will explore functions and classes — the features that C++ offers to organize a program — and use them to solve more complex problems. You will also understand common pitfalls and modern best practices, especially the ones that diverge from the C++98 guidelines. As you advance through the chapters, you'll study the advantages of generic programming and write your own templates to make generic algorithms that work with any type. This C++ book will guide you in fully exploiting standard containers and algorithms, understanding how to pick the appropriate one for each problem. By the end of this book, you will not only be able to write efficient code but also be equipped to improve the readability, performance, and maintainability of your programs.
Table of Contents (9 chapters)
C++ Fundamentals

Lesson 2: Functions

Activity 3: Calculating if a Person is Eligible to Vote or Not

  1. Include the header file in the program to print the output as shown here:

    #include <iostream>
  2. Now, create a function named byreference_age_in_5_years and the if loop with the following condition to print the message:

    void byreference_age_in_5_years(int& age) {
      if (age >= 18) {
        std::cout << “Congratulations! You are eligible to vote for your nation.” << std::endl;
  3. Add the else block to provide another condition if the age of the user is less than 18 years:

      } else{
        int reqAge = 18;
        int yearsToGo = reqAge-age;
        std::cout << “No worries, just “<< yearsToGo << “ more years to go.” << std::endl;
  4. In the main function, create a variable of type integer and pass it as a reference in the byreference_age_in_5_years function as shown:

    int main() {
        int age;
        std::cout << “Please enter your age:”;
        std::cin >> age;