例6-5
2013-10-06 15:52 Summer.xia 阅读(92) 评论(0) 编辑 收藏 举报#include<stdio.h> int main(void) { char ch; printf("input characters:"); ch=getchar(); while(ch!='\n'){ if(ch>='A'&&ch<='Z') ch=ch-'A'+'a'; else if(ch>='a'&&ch<='z') ch=ch-'a'+'A'; putchar(ch); ch=getchar(); } return 0; }