24 lines
605 B
C++
24 lines
605 B
C++
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#include <iostream>
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#include <regex> // 引入正则表达式库
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using namespace std;
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int main()
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{
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string x;
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cout << "输入一个字符:" << endl;
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cin >> x;
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regex regex_lower("[a-z]");
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regex regex_upper("[A-Z]");
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cout << regex_match(x, regex_lower) << regex_match(x, regex_upper) << endl;
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// 正则表达式
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if (regex_match(x, regex_lower)) // regex_match 匹配正则表达式
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{
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cout << (char)(x.at(0) - 32) << endl; // .at(0) 获取第一个字符
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}
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else if (regex_match(x, regex_upper))
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{
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cout << (char)(x.at(0) + 32) << endl;
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}
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}
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