小知识点~

Posted 2021-02-15 zhying99

 

1.转换为小写字母
str="qwer";
transform(str.begin(),str.end(),str.begin(),::tolower);
cout<<"转化为小写后为："<<str<<endl;
transform(str.begin(),str.end(),str.begin(),::toupper);
cout<<"转化为大写后为："<<str<<endl;