关于计算器的式子 #18
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ppt上说”1×-1"这样的式子是不合法的，那么对于负号来说，一定要"1×(-1)"这样吗，那么"-1"就不合法，要"(-1)"吗这是关于负号的使用的合法性，应该要统一吧 |
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Replies: 1 comment 4 replies
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主要是想把负号和它后面的数字看成一整块，一个单位 |
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总之规则就是上面说的那样，内部怎么处理由你来选择 |
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那“-1×1” "1+(-1×1)"应该合法吧 |
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是的 |
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1x-1不合法是因为不能有两个连续的运算符，负号可以出现在表达式的开头或者左括号的后面，这里没有什么冲突吧