排排看（p20）

public class paixu{
public static void main(string[] args){
int x=3;
if(x>2){
system.out.print("a");
}
x=x-1;
system.out.print("-");
if(x==2){
system.out.print("b c");
}
x=x-1;
system.out.print("-");
while(x>0){
if(x==1){
system.out.print("d");
x=x-1;
}
}
}
}