5.5. Boolean Values¶
The types we have seen so far are pretty big. There are a lot of integers in the world, and even more floating-point numbers. By comparison, the set of characters is pretty small. Well, there is another type in C++ that is even smaller. It is called boolean, and the only values in it are true and false.
Without thinking about it, we have been using boolean values for the last couple of chapters. The condition inside an if statement or a while statement is a boolean expression. Also, the result of a comparison operator is a boolean value. For example:
if (x == 5) {
// do something
}
The operator == compares two integers and produces a boolean value.
The values true and false are keywords in C++, and can be used anywhere a boolean expression is called for. For example,
while (true) {
// loop forever
}
is a standard idiom for a loop that should run forever (or until it reaches a return or break statement).
Before you keep reading...
Making great stuff takes time and $$. If you appreciate the book you are reading now and want to keep quality materials free for other students please consider a donation to Runestone Academy. We ask that you consider a $10 donation, but if you can give more thats great, if $10 is too much for your budget we would be happy with whatever you can afford as a show of support.
Put the following blocks in order of how large the set is. Put the largest set at the top.