在C++中，定义函数时可以给形参指定一个默认的值，这样调用函数时如果没有给这个形参赋值（没有对应的实参），那么就使用这个默认的值。也就是说，调用函数时可以省略有默认值的参数。如果用户指定了参数的值，那么就使用用户指定的值，否则使用参数的默认值。
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1.1.14 C++函数的默认参数详解
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- 2026-09-21
- C++
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1.1.11 C++ inline内联函数详解
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1.1.8 C++布尔类型（bool）
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- 2026-09-21
- C++
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1.1.10 C++ new和delete运算符简介
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1.1.7 C++变量的定义位置
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