下列程序输出的结果是( )。 #include ＜stdio.h＞ sub1(char a,char b)char c;c=a;a=b;b=c; sub2(char*a,char b)char c;c=*a;*a=b;b=c; sub3(char*a,char*b) char c;c=*a;*a=*b;*=c; void main() char a,b; a='A';b='B'; sub1(a,b);putchar(a);putchar(b); a='A';b='B'; sub2(&a,b);putchar(a);putchar(b); a='A';b='B'; sub3(&a,&b);putchar(a);putchar(b); putchar(' n');
A．BABBAB
B．ABBBBA
C．ABBABA
D．ABABBA