Summary - C++ basics
- C++ course
- Beginner
- Lesson 6/116
- 5 min
Combine main, cout and cin to write your first C++ program.
Summary - C++ basics
In this section you learned the building blocks of C++:
- including a header with #include
- the main function as the entry point
- printing text with std::cout
- reading input with std::cin
- adding comments with // and /* */
Now you will combine these concepts by writing a small program.
Practice Write a welcome message
Add a std::cout line inside the empty main. The output must be Hello C++. End the line with std::endl.
Starter code
#include <iostream>
int main() {
return 0;
}Sample solution
#include <iostream>
int main() {
std::cout << "Hello C++" << std::endl;
return 0;
}Expected output
Hello C++
Practice Commented welcome
Add a // comment to the program and produce the output Let us start with std::cout. End the line with std::endl.
Starter code
#include <iostream>
int main() {
return 0;
}Sample solution
#include <iostream>
int main() {
// Welcome message
std::cout << "Let us start" << std::endl;
return 0;
}Expected output
Let us start
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Program skeleton
Question
#include <iostream>
int ____() {
return 0;
}
Answer
#include <iostream>
int main() {
return 0;
}Explanation: The main function is the entry point of a C++ program.
2 Match the section concepts
| Term | Meaning |
|---|---|
#include <iostream> |
I/O library |
std::cout |
Writes to screen |
std::cin |
Reads from keyboard |
// |
Single-line comment |