java实验报告 第一个

import java.util.Scanner;

public class TheFirstDemo {

public static void main(String[] args) {
Scanner myinput = new Scanner(System.in);
System.out.print("请输入你想产生的行数：");

int col = myinput.nextInt();
int i,j,k;
for(i=1;i<=col;i++){
for(j=1;j<=col-i;j++)
System.out.print(" ");

for(k=1;k<=i*2-1;k++){
if(k%2==0)
System.out.print(" ");
else
System.out.print("@");

}
System.out.println();
}
}

}