以下程序的输出结果是
char 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 "%$\n", s);

A．abc+ABC=DEFdef

B．abc+abc=defdef

C．abcABCDEFdef

D．abcabcdefdef