C++ 字符串大小写转换：密码生成器

#include\u0020 #include\u0020 using\u0020namespace\u0020std;

string\u0020convertToUpperCase(string\u0020s)\u0020{ \u0020\u0020for(int\u0020i=0;\u0020i<s.length();\u0020i++)\u0020{ \u0020\u0020\u0020\u0020if(s[i]\u0020>=\u0020'a'\u0020&&\u0020s[i]\u0020<=\u0020'z')\u0020{ \u0020\u0020\u0020\u0020\u0020\u0020s[i]\u0020=\u0020s[i]\u0020-\u0020'a'\u0020+\u0020'A'; \u0020\u0020\u0020\u0020} \u0020\u0020} \u0020\u0020return\u0020s; }

int\u0020main()\u0020{ \u0020\u0020string\u0020s; \u0020\u0020cin\u0020>>\u0020s; \u0020\u0020cout\u0020<<\u0020convertToUpperCase(s)\u0020<<\u0020endl; \u0020\u0020return\u00200; }