#include <
string>
#include <algorithm>
void test()
{
std::string strA=
"QQQQWWWqqqqqqwwwwwww;
//std::string的大小写转换
transform(strA.begin(), strA.end(), strA.begin(), ::toupper);
transform(strA.begin(), strA.end(), strA.begin(), ::tolower);
}
转载于:https://www.cnblogs.com/jingdian1956/p/3462475.html
