public class Demo11{
public static void main(String[] args){
int row=20;
int col =row/2;
for(int x=-col;x<=col;x++){
for(int y=-col;y<=col;y++){
if(Math.abs(x)+Math.abs(y)<=col){
System.out.print((char)('a'+Math.abs(y)+Math.abs(x)));
}else{
System.out.print(" ");
}
}
System.out.print("\n");
}
}
}
int col =row/2;这个是干什么用的,什么意思?