最近看C++课本发现了substr这个神奇的函数，然后就根据这个写了个字符串转置的函数。
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| #include <string>
using std::string;
string reverse(const string& str) {
if (str.length() == 1) return str;
if (str.length() == 2)
return string(str.substr(1, 1) + str.substr(0, 1));
string sub = str.substr(1, str.length() - 1);
return reverse(sub) + str.substr(0, 1);
}
int main() {
string teststr1 = "1";
string teststr2 = "12";
string teststr3 = "123";
string teststr4 = "I love C++.";
printf("%s\n", teststr1.c_str());
printf("%s\n", reverse(teststr1).c_str());
printf("%s\n", teststr2.c_str());
printf("%s\n", reverse(teststr2).c_str());
printf("%s\n", teststr3.c_str());
printf("%s\n", reverse(teststr3).c_str());
printf("%s\n", teststr4.c_str());
printf("%s\n", reverse(teststr4).c_str());
}
|
嗯，大概就这样了