c++ 字符大小写转化

#include<iostream>usingnamespacestd;intmain(){chara;cin>>a;//a-z-97-122//A-Z-65-90//差32//小写转大写if(97<=(int)a&&(int)a<=122){a=(int)a-32;cout<<a;return0;}//大写转小写if(65<=(int)a&&(int)a<=90){a=(int)a+32;cout<<a;}return0;}