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Set Up a C++ Compiler

Set Up a C++ Compiler

A compiler translates source into executable code.

Save the program as main.cpp and compile with clang++ -std=c++17 -Wall -Wextra -pedantic main.cpp -o school, or equivalent g++ flags. Run ./school on macOS/Linux; Windows uses the executable path.

Before this lesson, review What Is C++? when needed.

What you’ll learn

  • Use setup and compilation to set Up a C++ Compiler.
  • Explain how the complete example produces Compiler ready.
  • Make the practice change and explain why the result changes or stays the same.

Follow a complete C++ example

Save the program as main.cpp and compile with clang++ -std=c++17 -Wall -Wextra -pedantic main.cpp -o school, or equivalent g++ flags. Run ./school on macOS/Linux; Windows uses the executable path.

Read the declarations above main before tracing its statements. Each declared name supplies the value, type or operation used later. The std:: prefix selects a name from the standard library, and cout << sends a value to the output stream.

C++17 · main.cpp · complete program

#include <iostream>

int main()  {
  std::cout << "Compiler ready" << '\n';
  return 0;
}

Expected output

Compiler ready
Run in C++ compiler →

Connect the code to its result

C++17 · source used in this explanation

#include <iostream>

int main()  {
  std::cout << "Compiler ready" << '\n';
  return 0;
}

Expected output

Compiler ready

A compiler translates source into executable code. Save the program as main.cpp and compile with clang++ -std=c++17 -Wall -Wextra -pedantic main.cpp -o school, or equivalent g++ flags. Run ./school on macOS/Linux; Windows uses the executable path.

Trace the result: Read the complete program below from its starting values to the output operations. Each std::cout statement displays the value supplied at that point; \n begins the next line. The resulting lines, in order, are Compiler ready. In this example, distinguish what the program calculates or changes from what it actually displays.

Important mistakes and boundaries

A compiler and an editor are different tools. Available flags and executable paths vary by platform; selecting C++17 does not install a compiler.

Change the school example

C++17 · edit this complete example

#include <iostream>

int main()  {
  std::cout << "Compiler ready" << '\n';
  return 0;
}

Your task: Change the message to School ready. Before running your edited program, predict the new output and explain which stored value, condition or object changes. Keep the rest of the example intact.

Use the complete source repeated here; this task does not depend on remembering code from another section.

Worked answer and reasoning

Worked variation: Change the message to School ready. The executable prints the new message after recompilation.

A compiler translates source into executable code. Save the program as main.cpp and compile with clang++ -std=c++17 -Wall -Wextra -pedantic main.cpp -o school, or equivalent g++ flags. Run ./school on macOS/Linux; Windows uses the executable path.

A compiler and an editor are different tools. Available flags and executable paths vary by platform; selecting C++17 does not install a compiler.

For a baseline run, save this source as main.cpp and use clang++ -std=c++17 -Wall -Wextra -pedantic main.cpp -o school, or equivalent g++ flags. Recompile after editing so that you run the updated executable.

The source and output below belong to the edited program. Compare them with the original example to see the consequence of this single change.

C++17 · worked variation · complete program

#include <iostream>

int main()  {
  std::cout << "School ready" << '\n';
  return 0;
}

Expected output

School ready
Run in C++ compiler →

Check your understanding

C++17 · original program for this question

#include <iostream>

int main()  {
  std::cout << "Compiler ready" << '\n';
  return 0;
}
Before making the practice edit, what does the original C++17 program print?
Choose one answer. You can try again.

Answer and explanation

Compiler ready

A compiler translates source into executable code. Save the program as main.cpp and compile with clang++ -std=c++17 -Wall -Wextra -pedantic main.cpp -o school, or equivalent g++ flags. Run ./school on macOS/Linux; Windows uses the executable path. A compiler and an editor are different tools. Available flags and executable paths vary by platform; selecting C++17 does not install a compiler.

What to remember

A compiler translates source into executable code. A compiler and an editor are different tools. Available flags and executable paths vary by platform; selecting C++17 does not install a compiler.

Useful connections: What Is C++?, Give a Task a Name.

Language and design guidance: C++ Core Guidelines and C++ working draft. The draft describes an evolving language; these examples deliberately target C++17.

Reaching the recap and completing the quizzes are separate milestones.

    Next lesson: Your First C++ Program →