What are the return value types of functions in C++?

The return value type of a function in C defines the type of value returned after execution: Basic types: void (no return value), bool, integer, floating point, character reference type: type reference, type pointer structure or class : Type instance

The return value type of the function in C

The return value type of the function defines the value returned after the function is executed type.

Basic types

• void: Returns no value.
• bool: Returns a Boolean value.
• Integer type (int, short, long): Returns an integer.
• Floating point type (float, double): Returns a floating point number.
• Character type (char): Returns a single character.

Reference type

• T&: Returns a reference to type T.
• T*: Returns a pointer to type T.

struct and class

• struct or class name: Returns an instance of this type .

Practical case

Consider a function that calculates the sum of two numbers:

// 返回两个数字的和
int add(int a, int b) {
  return a + b;
}

The return value type of this function isint because it returns an integer.

Here's how to use this function:

int sum = add(10, 20);  // sum 将包含 30

Other notes

• A function can have no return value type, in this case , they return void.
• If a function does not explicitly specify a return value type, the compiler will default to int.
• You can specify that the return value is a constant by using the const keyword.

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