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common lisp的函数MINUSP, PLUSP,ZEROP
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| 语法 | |
| minusp real => generalized-boolean | |
| plusp real => generalized-boolean | |
| zerop number => generalized-boolean | |
| 参数和值 | |
| real -- 一个实数(有理数和物理数) | |
| number -- 数(实数和虚数) | |
| generalized-boolean -- 一个布尔型的值 | |
| 描述 | |
| 如果real的值小于0, minusp 的结果返回真,否则返回假 | |
| 如果real的值大于0, minusp 的结果返回真,否则返回假 | |
| 如果number的值为0, zerop 的结果返回真,否则返回假 | |
| 代码片段(`*`是sbcl的提示符) | |
| * (zerop (/ 1 9)) | |
| NIL | |
| * (minusp -1) | |
| T | |
| * (plusp 1) | |
| T |
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