bool and char

Learn to store logical values with bool and characters with char.

bool and char

The bool type takes only two values: true (1) and false (0). It is used in conditions and flags: bool active = true;.

The char type holds a single character: char grade = 'A';. Characters are written in single quotes. A char is actually a small integer; each character has a number in the ASCII table.

When printing a bool, std::cout shows 1 or 0; to print true/false use std::boolalpha.

char and numbers

Each char maps to a number: 'A' = 65, 'B' = 66, 'a' = 97, '0' = 48. So writing char c = 65; and then std::cout << c; prints A.

This lets you do arithmetic between characters: 'A' + 1 gives 'B'. It is handy for ordering or converting letters.

Conversely, static_cast<int>('A') gives 65. This is how you convert between characters and numbers.

Exercise Print bool and char

Inside main, declare a bool (value true) and a char (value 'B'). Print both on separate lines with std::cout using std::endl.

Show example solution

#include <iostream>

int main() {
    // Declare bool and char
    bool ready = true;
    char grade = 'B';
    // Print each with std::cout
    std::cout << ready << std::endl;
    std::cout << grade << std::endl;
    return 0;
}

Test yourself

Match types with examples

bool

true
char

'A'
true

1
'B'

66
What is the output of char c = 65; std::cout << c;?
```
char c = 65;
std::cout << c;
```
- A
- B
- Error
- 65
Show answer

A — 65 corresponds to the letter 'A' in the ASCII table.
Character declaration
```
____ grade = 'B';
```
Show answer
```
char grade = 'B';
```

Next lesson: std::string

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