THINK++ — Engineering Visualized

Flexibility

Default Arguments

Allows calling a function with fewer arguments by providing predefined values for parameters if the caller omits them.

EXAMPLE

void greet(string name, string msg = "Hello") {
    cout << msg << ", " << name;
}

greet("Alice");          // Output: Hello, Alice
greet("Bob", "Welcome"); // Output: Welcome, Bob

TRAILING RULE

Default parameters must always be at the END of the parameter list. You cannot have a non-default parameter after a default one.

void error(int a = 1, int b); // ERROR!

REDUCING OVERLOADS

Default arguments can often replace the need for multiple overloaded functions, making the code more maintainable.

Loading Lab...