单项选择题

以下程序的输出结果是 chsr cchar(char ch) { if(ch>='A'&&ch<='Z')ch=ch-'A'+'a'; return ch; } main() { char s[]=“ABC+abc=defDEF”,*p=s; while(*p) { *p=cchar(*p); p++; } printf(“%s\n”,s); }

A.abd+ABC=DEFdef
B.abc+abc=defdef
C.abcABCDEFdef
D.abcabcdefdef