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Chapter 2: Problem 11

Write a complete \(C++\) program that writes the phrase Hello world to the screen. The program does nothing else.

Short Answer

Expert verified
Question: State the purpose of including the iostream library in a C++ program. Answer: The purpose of including the iostream library in a C++ program is to enable input and output operations, such as using 'cout' to display text on the screen.

Step by step solution

01

Include necessary libraries

To begin, include the necessary library (iostream) in your program. The 'iostream' library is used for input and output operations in a C++ program, and we'll be using 'cout' from this library to display our text. ```cpp #include ```
02

Declare the main function

Declare the main function, which is the entry point of our program. All C++ programs must have a main function. The function returns an integer (int), and takes no arguments/parameters. ```cpp int main() { } ```
03

Add 'cout' statement inside the main function

Inside the main function, use the 'cout' statement along with the '<<' operator to output the "Hello world" text to the screen. ```cpp int main() { std::cout << "Hello world"; } ```
04

Add a return statement and a newline character

It is good practice to end the main function with a return statement since the function is declared with a return type of 'int'. Additionally, to make the output look cleaner, it's recommended to add a newline character at the end of the "Hello world" text by using 'endl'. ```cpp int main() { std::cout << "Hello world" << std::endl; return 0; } ```
05

Final C++ program

Combine all the steps to create the final C++ program. The program writes the phrase "Hello world" to the screen and does nothing else. ```cpp #include int main() { std::cout << "Hello world" << std::endl; return 0; } ```

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Most popular questions from this chapter

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