c，废我一天时间

int i=20;

printf(“%f”, ____);

打印结果是6.666667

int a = 5,b = 4,c = 3,d=2;

if (a>b>c) printf ("%d\n",d) ;

else if ((c-1>=d)==1) printf("%d\n",d+ 1);
else printf( "%d\n",d+2);

void main ( )

{

float x=2.0, y;

if (x<0.0) y=0.0;

 else if (x<10.0) y=1.0/x;
else y=1.0;
printf ("%f\n", y)；
}

void main ( ){

int a, b;

scanf(“ %d,%d” ,&a,&b);

if (a > b) a = b; b = a;

else a++;b++;
printf(“ %d,%d” ,a,b);
}

void main ( )

{

    char c = 'a';
if ('a'<c<='z') printf("LOW");
else printf ( "UP" ) ;
}

int x=3;
switch(x)
{

case 1:
case 2:printf("x<3\n");break;
case 3:printf("x=3\n");break;
case 4:
case 5:printf("x>3\n");break;
default:printf("x unknow\n");break;

}
该程序的运行结果是（）。

()