下列程序的输出结果是______。 #include sub1(char a char b){char c; c=a;a=b;b=c;} sub2(char*

下列程序的输出结果是______。 #include 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;*b=c;} { char a,b; a="A" ;b="B"; sub3 (&a, &b) ;putchar (a) ;putchar (b); a="A";b="B";sub2(&a,b);putchar(a);prtchar(b); a="A";b="B";sub1(a,b);putchar(a) ;putchar(b); }

A．BABBAB

B．ABBBBA

C．BABABA

D．BAABBA

请帮忙给出正确答案和分析，谢谢！