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

The return type of a C function specifies the data type of the value returned after its execution, which must match the declared type. Common return types include: void: returns no value. int: Returns an integer. double: Returns a double-precision floating point number. bool: Returns a Boolean value. string: Returns a string.

C The return type of a function specifies

In C, the return type of a function specifies the data of the value returned after execution type. Specifying the return type is crucial because it allows the compiler to verify that the value returned by the function matches the declared type.

Return type syntax

The return type of the function is written before the function name, followed by the function parameter list:

<返回类型> 函数名(参数列表) {
  // 函数体
}

Return type example

The following are some common examples of return types:

• void: Indicates that the function does not return any value.
• int: Returns an integer.
• double: Returns a double-precision floating point number.
• bool: Returns a Boolean value (true or false).
• string: Returns a string.

Practical case

Consider the following C function, which calculates and returns the sum of two numbers:

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

In this function:

• int is the return type of the function, indicating that the function will return an integer.
• sum is the function name.
• int num1, int num2 are function parameters, they are also integers.
• The function body contains the code that actually calculates and returns the result.

When this function is called, the compiler checks the return type to ensure that the value returned by the function matches the declared type. If they don't match, a compiler error will occur.

Important

• Functions must return the correct value for the declared type.
• The return type cannot be changed within the function body.
• void The function cannot return any value using the return statement.

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