A guide to building reusable code using C++ functions

Answer: Functions in C are the basic building blocks for building reusable code, encapsulating code into modular units that can be reused across programs. Define the function: returnType functionName(argumentList), where returnType is the return type, functionName is the identifier, and argumentList is the optional argument list. Actual parameters and formal parameters: When calling a function, the actual parameters are passed to the formal parameters, which are local variables in the function definition. Function overloading: allows the definition of multiple functions with the same name but different parameter lists. Advantages: reusability, modularity, code simplicity, maintainability, testability.

A guide to building reusable code using C functions

In C, functions are the basic building blocks for building reusable code . They allow you to encapsulate code in modular units that can be easily reused across multiple programs.

Define a function

To define a function, use the following syntax:

returnType functionName(argumentList) {
    // 函数体
}

Where:

• returnType is the type of value returned by the function. Can be void if the function returns no value.
• functionName is the identifier of the function.
• argumentList is an optional list of arguments passed into the function.

Actual parameters and formal parameters

When a function is called, the actual parameters (actual parameters) are passed to the formal parameters of the function. Formal parameters are variables in a function definition that behave like local variables.

Function Overloading

C allows function overloading, which means that multiple functions with the same name but different parameter lists can be defined. The behavior of overloaded functions depends on the parameters passed in.

Practical Case

Consider the following example, which is a function that calculates the sum of two numbers:

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

int main() {
    // 在 main() 中调用函数
    int result = sum(5, 10);
    cout << "两个数字的和是： " << result << endl;

    return 0;
}

Advantages

Using functions provides the following advantages:

• Reusability: Functions can be easily reused across multiple programs.
• Modularity: Functions organize code into small, manageable units.
• Code simplicity: Using functions can reduce code duplication.
• Maintainability: Functions are easier to maintain and update because they are independent units.
• Testability: Unit testing a function is easier because it can be executed independently of other code.

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