How is the return value type defined in a C++ function?

The return value type in a C function is defined before the parentheses of the function signature. It represents the data type returned by the function: return_type function_name(parameter_list) For example, if the function returns the sum of integers and calculates two numbers, the syntax is: int add(int num1, int num2)

Definition of return value type in C function

In C function, the return value type is defined before the parentheses of the function signature. The syntax is as follows:

return_type function_name(parameter_list) {
  // 函数体
}

Among them, return_type represents the data type returned by the function, function_name is the function name, parameter_list is the parameter list of the function ( can be empty).

Practical Case

Consider a function that calculates the sum of two numbers and returns their sum:

int add(int num1, int num2) {
  return num1 + num2;
}

In this example, int is the return value type, which means that the function will return an integer.

Other Notes

• If the function does not return any value, you can use void as the return value type.
• A function can return a reference or pointer, but it must be explicitly declared before the return value type.
• C 11 introduced the auto keyword, allowing the compiler to infer the return value type.

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