下列程序输出的结果是( )。#include<stdio.h>fun1(char a,char b) {char c;c=a;a=b;b=c;}fun2(char*a,char b) {char c;c=*a;*a=b;b=c;}fun3(char*a,char*b) {char c;c=*a;*a=*b;*b=c;}void main(){char a,b;a=’A’;b=’B’; fun1 (a,b);putchar(a);putchar(b);a=’A’;b=’B’; fun2 (&a,b);putchar(a);putchar(b);a=’A’;b=’B’; fun3 (&a,&b);putchar(a);putchar(b);putchar(’\n’);}
A.BABBAB
B.ABBBBA
C.ABBABA
D.ABABBA