string类对象_大小写字母转换

#include <iostream>

#include <string>

using namespace std;



int main()

{

string str1 = "MileStone";

char *ch;

ch = (char *)str1.c_str();



for(int i = 0; i < str1.size(); i++)

{

if(ch[i] >= 'A' && ch[i] <= 'Z')

ch[i] += 'a' - 'A';

}

string s = ch;

cout << s << endl;

return 0;

}

输出：

milestone