怎么转换大小写?
程序代码:
#include <iostream> #include <cctype> #include <string> using namespace std; void main() { string str ; string words; cout<<"please input string"<<endl; std::getline(cin,str); cout <<"please input words"<<endl; cin>>words; size_t wordsLength = words.length(); size_t pos ; for (size_t i = 0 ; i<str.length() ; i=pos + wordsLength) { pos = str.find(words,i); if (pos == string::npos) { break; } if (pos == 0) { str.replace(pos,wordsLength,wordsLength,'*'); } size_t prepos = pos -1; size_t lasrpos = pos+wordsLength+1; if ((prepos,1," ") == 0&&(lasrpos,1," ")) { str.replace(pos,wordsLength,wordsLength,'*'); } } cout<<str<<endl; }目的就是在一个指定的字符串中替换制定单词为***。现在我想进行一下大小写转换。比如str=“What your name”,你要替换的单词输入时是words=what(这里的w是小写的),这样也能替换成功。或者更复杂点,比如str=“WHAT your name”,words=what(都是小写),这样也能替换WHAT为****。
在上面的基础上怎么修改?