How are function return types specified in C++?

In C, the function return type specifies the value type returned to the caller after the function is called. Steps include: Selecting a data type that matches the expected return value (such as int, float, char, bool). Place a declaration of the selected type before the function name (such as int get_number()).

Guidelines for specifying function return types in C

In C, function return types are integral to function signatures A part used to specify the value type returned to the caller after the function is called. To specify a function return type, follow these steps:

Step 1: Select a data type

Select a C data type that corresponds to the expected return value. For example:

• Integer type: int, long, short
• Floating point type: float, double, long double
• Character type: char, wchar_t
• Boolean type: bool
• Custom type (class or structure)

Step 2: Place the type declaration before the function name

Place the declaration of the selected type before the function name. For example:

// 返回整数
int get_number();

// 返回浮点数
float calculate_average();

// 返回一个字符串
std::string create_message();

Practical example:

Consider a function that calculates the sum of two numbers:

// 返回两个数字的和
int add_numbers(int num1, int num2) {
  return num1 + num2;
}

In this case, the expected function returns An integer, so we use int type as the return type.

Note:

• If the function does not return a value, you need to use void as the return type.
• If the function returns a reference, you need to use a reference type (&), such as std::string&.
• Function can return any data type, including pointers, arrays and even other functions.

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