c 编程实例100题(核心准则ES.105:避免被0除)(1)

ES.105: Don't divide by zero

ES.105:避免被0除

Reason(原因)

The result is undefined and probably a crash.

结果无定义,很可能会导致程序崩溃。

Note(注意)

This also applies to %.

本规则也适用于取余运算。

Example, bad(反面示例)

double divide(int a, int b) { // BAD, should be checked (e.g., in a precondition) return a / b; }

Example, good(范例)

double divide(int a, int b) { // good, address via precondition (and replace with contracts once C gets them) Expects(b != 0); return a / b; } double divide(int a, int b) { // good, address via check return b ? a / b : quiet_NaN<double>(); }

Alternative: For critical applications that can afford some overhead, use a range-checked integer and/or floating-point type.

可选项:对于能够承受一定代价的要求严格的应用,可以考虑使用带有范围检查的整数或者浮点数。

Enforcement(实施建议)

原文链接

https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#es105-dont-divide-by-zero


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