Usage and advantages of C++ default parameters

Yes, the default parameter feature in C allows you to omit certain parameters when a function is called. When the function is called and these parameters are not provided, the default values ​​​​are used, thereby improving the flexibility, readability and Maintainability.

C Default parameters: powerful functions and convenience

Overview

Default Parameters allow you to omit certain parameters when calling a function. When the function is called, if these parameters are not provided, the default values ​​are used. Default parameters provide code flexibility, readability, and maintainability.

Usage

To specify default parameters, simply specify them in the function's parameter list and provide a default value:

void myFunction(int a, int b = 5, int c = 10) {
  // 函数体
}

In this example , the default values ​​of b and c are 5 and 10 respectively.

Call

You can call a function with default parameters just like a normal function. When you omit a default parameter, its default value is used:

myFunction(1); // b 和 c 将使用其默认值
myFunction(1, 7); // b 为 7，c 将使用其默认值
myFunction(1, 7, 12); // b 和 c 分别为 7 和 12

Advantages

Using default parameters has the following advantages:

• Flexibility: Allows you to specify or omit parameters as needed when calling a function.
• Readability: Make the code easier to understand by specifying default values.
• Maintainability: When parameters change, you only need to update the function definition without modifying all function calls.
• Reduce Errors: Errors can be prevented by avoiding forgetting to provide required parameters.

Practical case

The following is a function that prints a string with a default length:

void printString(string str, int length = 20) {
  cout << str.substr(0, length) << endl;
}

This function can also be like Called like this, only provide string parameters:

printString("Hello World"); // 输出：Hello World

Or specify the length here:

printString("Hello World", 10); // 输出：Hello Wo

Conclusion

The default parameter is a useful one in C feature that allows you to omit certain parameters when calling functions, thereby improving the flexibility, readability, and maintainability of your code.

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