英文:
invalid operation: (operator - not defined on string)
问题
arrayAll := []string{"a", "b", "c", "d", "e"}
x := p[arrayAll[i]-"a"]
Go语言不支持运算符"-"
那么我该如何获取数组arrayAll[i]-"a"的索引呢？
英文:
arrayAll := []string{"a", "b", "c", "d", "e"}
x := p[arrayAll[i]-"a"]
go does not support operators "-"，
so how can I get the index of array：arrayAll[i]-"a"
答案1
得分: 2
你想要如何定义字符串的减法运算符-？调用"Hello"-"World"后你期望得到什么结果？
你是想对单个字符进行操作吗？对单个字符进行操作是有明确定义的，你可以预期'c'-'a'的结果确实是2。考虑以下代码：
arrayAll := []byte{'a', 'b', 'c'} // 或者简单地写成 "abc"
x := p[arrayAll[2] - 'a']
无论如何，你很可能不想对字符串进行减法运算，而是想对字符的整数表示进行减法运算。
英文:
How would you define operator - on strings? What result would you expect after calling "Hello"-"World"?
Are you trying to operate on single characters? This is well defined and you can probably expect 'c'-'a' to equal 2 indeed. Consider:
arrayAll := []byte{'a', 'b', 'c'} (or simply "abc")
x := p[arrayAll[2] - 'a']
One way or another you most probably don't want to subtract strings, but integer representations of characters.
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