How to specify the return value type of a C++ function?

C The return value type of a function is specified in the function declaration, which indicates the data type of the value returned after the function is executed. Common data types include void (no return value), primitive data types, structures, classes, and pointers. The return value type must match the data type of the value actually returned in the function body, otherwise a compilation error will occur.

C Function return value type specification

In C, the return value type of a function is specified in the function declaration. It specifies the data type of the value returned after function execution.

Syntax

return_type function_name(parameter_list) {
  // 函数体
}

Among them, return_type is the data type of the value returned by the function.

Common data types

Common return value types in C include:

• void: The function does not return any value.
• Basic data types (such as int, float)
• Structures and classes
• Pointers

Practical Case

Consider a function that calculates the sum of two integers:

int sum(int a, int b) {
  return a + b;
}

In this example, the sum function returns the sum of two integers, so its The return value type is specified as int.

Note

• When the function does not return any value, the return value type should be specified as void.
• The return value type must match the data type of the value actually returned in the function body.
• If the function body does not return any value, but the return value type is not void, a compilation error will occur.

The above is the detailed content of How to specify the return value type of a C++ function?. For more information, please follow other related articles on the PHP Chinese website!