问题描述
这是一个相当愚蠢的问题，但为什么在 C 或 C++ 中为数组定义 for 循环时通常使用 int 而不是 unsigned int?
This is a rather silly question but why is int commonly used instead of unsigned int when defining a for loop for an array in C or C++?
for(int i;i<arraySize;i++){}
for(unsigned int i;i<arraySize;i++){}
我认识到在做数组索引以外的事情时使用 int 的好处，以及在使用 C++ 容器时使用迭代器的好处.仅仅是因为在循环数组时无关紧要吗?或者我应该一起避免它并使用不同的类型，例如 size_t?
I recognize the benefits of using int when doing something other than array indexing and the benefits of an iterator when using C++ containers. Is it just because it does not matter when looping through an array? Or should I avoid it all together and use a different type such as size_t?
推荐答案
这是一个更普遍的现象，通常人们没有使用正确的整数类型.现代 C 的语义 typedef 比原始整数类型更可取.例如，大小"的所有内容都应该输入为 size_t.如果您系统地为应用程序变量使用语义类型，那么这些类型的循环变量也会变得更容易.
This is a more general phenomenon, often people don't use the correct types for their integers. Modern C has semantic typedefs that are much preferable over the primitive integer types. E.g everything that is a "size" should just be typed as size_t. If you use the semantic types systematically for your application variables, loop variables come much easier with these types, too.
而且我已经看到了一些难以检测的错误，这些错误来自于使用 int 左右.突然在大型矩阵之类的东西上崩溃的代码.只需使用正确的类型正确编码就可以避免这种情况.
And I have seen several bugs that where difficult to detect that came from using int or so. Code that all of a sudden crashed on large matrixes and stuff like that. Just coding correctly with correct types avoids that.
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