自考笔果题库-百万自考生的选择【官网】

有以下程序
#include
void f1(char *a, char b ){ char c; c=*a; *a=b; b=c; }
void f2(char a, char b ){ char c; c=a; a=b; b=c; }
void f3(char *a, char *b ){ char c; c=*a; *a=*b; *b=c; }
main（）
{ char t1, t2;
t1 = ''A''; t2 = ''B''; f3( &t1,&t2 ); putchar(t1);putchar(t2);
t1 = ''A''; t2 = ''B''; f2( t1, t2 ); putchar(t1);putchar(t2);
t1 = ''A''; t2 = ''B''; f1( &t1, t2 ); putchar(t1);putchar(t2);
printf("\n");
}
程序运行后的输出结果是______。

A

BAABBB

B

ABBABB

C

BABABA

D

BABAAB

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