C++17 Quick Syntax Reference: A Pocket Guide to the Language, APIs and Library

© Mikael Olsson 2018

Mikael OlssonC++17 Quick Syntax Referencehttps://doi.org/10.1007/978-1-4842-3600-0_9

9. Conditionals

Mikael Olsson¹ 

(1)

Hammarland, Finland

 

Conditional statements are used to execute different code blocks based on different conditions.

If Statement

The if statement will execute only if the expression inside the parentheses is evaluated to true. In C++, this does not have to be a Boolean expression. It can be any expression that evaluates to a number, in which case zero is false and all other numbers are true.

if (x < 1) {

  cout << x << " < 1";

}

To test for other conditions, the if statement can be extended by any number of else if clauses.

else if (x > 1) {

  cout << x << " > 1";

}

The if statement can have one else clause ...