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string中用于查找的系列find函数
以下所有的 string 查找函数,都有唯一的返回类型,那就是 string::size_type,即一个无符号整数。若查找成功,返回按查找规则找到的第一个字符或子串的位置;若查找失败,返回string::npos,即-1(打印出来为 )。
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