第一次上机作业

1.输出学号班级和姓名

public class homework {

    /**
     * @param args
     */
    public static void main(String[] args) {
        System.out.printf("计算机1904 193230423");
        System.out.printf("孟楠");
        // TODO Auto-generated method stub

    }

}

2.输出以下图形 

     *
    ***
   *****
    ***
     *

public class homework2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        System.out.println("  *");
        System.out.println(" ***");
        System.out.println("*****");
        System.out.println(" ***");
        System.out.println("  *");
        // TODO Auto-generated method stub

    }

}

3.定义两个整型变量a=5  b=8  求平方和并输出

public class homework3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        int a,b;
        a=5;
        b=8;
        System.out.println(a*a+b*b);
        // TODO Auto-generated method stub

    }

}