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Default parameters and variable parameters in C can be applied to object-oriented programming to improve code readability and reusability: Default parameters: allow specifying default values for function parameters, which are used by default; variable parameters: support functions Handle an indefinite number of parameters to improve code flexibility.
Application of C function default parameters and variable parameters in object-oriented programming
Default parameters
Default parameters allow us to specify default values for parameters when declaring a function. When a function is called, if no parameter value is provided, the default value will be used. In C, the default parameters are declared as follows:
void func(int a, int b = 10); // b 的默认值为 10
Practical case:
Consider a function that calculates the sum of two numbers:
int sum(int a, int b = 0) { return a + b; } int main() { // 使用默认值 cout << sum(5) << endl; // 输出:5 // 提供第二个参数 cout << sum(5, 10) << endl; // 输出:15 }
Variadic parameters
Variadic parameters (also called variadic parameters) allow a function to accept a variable number of parameters. In C, use ...
to represent variable parameters:
int sum(int numArgs, ...) { // 获取参数列表 va_list args; va_start(args, numArgs); // 遍历参数列表并相加 int sum = 0; for (int i = 0; i < numArgs; i++) { sum += va_arg(args, int); } // 清理参数列表 va_end(args); return sum; } int main() { // 传递不定数量的参数 cout << sum(2, 5, 10) << endl; // 输出:15 cout << sum(3, 1, 2, 3) << endl; // 输出:6 }
Advantages
Use default parameters and variable parameters in object-oriented programming has the following advantages:
Through careful use of default and variadic parameters, you can write object-oriented programs that are more powerful, more reusable, and more readable.
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