题目内容

#include void main(){ char ch;while((ch=getchar())!='\n'){ if (ch>='A'&&ch<='Z') ch=ch+32;else if (ch>='a'&&ch<='z') ch=ch-32;printf("%c",ch);}}输入：ABCdef<回车>

A. abcdef
B. abcDEF
C. ABCdef
D. ABCDEF

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