第一次作业

package text1;

public class HelloWorid{
    public static void main(String argn[]) {
        System.out.println("计算机1905尚艺193230518");
    }
}

2.

package text1;

public class HelloWorid{
    public static void main(String[] args){
        int n = 3;
        printStar(n);
    }
    private static void printStar(int n){
        for(int i=0;i<n;i++){
            for(int j=0;j<2*n;j++){
            if(j<n-i)
              System.out.print(" ");
            if(j>=n-i && j<=n+i)
              System.out.print("*");
          }
          System.out.println();
        }
        for(int i=1;i<n;i++){
            System.out.print(" ");
            for(int j=0;j<2*n-i;j++){
                if(j<i)
              System.out.print(" ");
            if(j>=i && j<2*n-i-1)
              System.out.print("*");
            }
            System.out.println();
        }
    }
}

 

3.

package text1;

public class HelloWorid{
    public static void main(String[] args){
        int a= 5,b=8;
            System.out.println(a*a+b*b);
    }
}