c++ 字符大小写转化

#includeiostreamusingnamespacestd;intmain(){chara;cina;//a-z-97-122//A-Z-65-90//差32//小写转大写if(97(int)a(int)a122){a(int)a-32;couta;return0;}//大写转小写if(65(int)a(int)a90){a(int)a32;couta;}return0;}