Explain the syntax of C++ function return value types

C function return value type is used to specify the value type returned after the function is executed, located before the function name. Common types include basic data types, class objects, and void. void means that the function does not return an explicit value. The function return value type determines the value type returned by the function, such as int returning an integer and void executing an operation without returning a value.

Detailed syntax of C function return value type

Introduction

In C , the function return value type specifies the data type of the value returned after the function is executed. It appears in front of the function name.

Syntax

return_type function_name(parameter_list) { ... }

Where:

• return_type is the return value type of the function.
• function_name is the name of the function.
• parameter_list are the parameters passed to the function, separated by commas.
• {...} is the function body, containing the code to be executed.

Return value type

The return value type can be any valid C data type, including basic types (such as int, float, double), class objects and void etc.

void

void is a special type of return value, indicating that the function does not return any value. A void function is typically used to perform operations without returning an explicit value.

Example

The following are some examples of function return value types:

int sum(int a, int b) { return a + b; }
float average(int a, int b) { return (float)(a + b) / 2; }
void printHello() { std::cout << "Hello, world!" << std::endl; }

Practical case

Consider the following function that displays basic information about an employee:

class Employee {
public:
    std::string name;
    int salary;
};

Employee getEmployeeInfo() {
    Employee emp;
    emp.name = "John Doe";
    emp.salary = 50000;
    return emp;
}

In this example, the getEmployeeInfo function returns an object of class Employee that contains the employee's information.

Conclusion

By understanding the syntax of C function return value types, functions can be correctly defined and used to achieve the expected functions.

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