For循环练习

public class ForTest {
    public static void main(String args[]){
        //直角三角形
        /*for(int i = 1; i <= 5; i++){
            for(int j = 1;j <= i;j++){
                System.out.print("*");
            }
            System.out.print("
");
        }*/
        //等腰三角形
        /*for(int i = 1; i <=5;i++ ){
            for(int j = 1; j <= 5-i;j++){
                System.out.print(" ");
            }
            for(int k = 1; k <= 2 * i - 1; k++){
                System.out.print("*");
            }
            System.out.print("
");
        }*/
        //菱形
        /*for(int i = 1; i <= 5;i++){
            for(int j = 1; j <= 5-i; j++){
                System.out.print(" ");
            }
            for(int k = 1; k <= 2*i-1; k++){
                System.out.print("*");
            }
            System.out.print("
");
        }
        for(int l = 1; l <= 4; l++){
            for(int m = 1; m <= l; m++){
                System.out.print(" ");
            }
            for(int n = 1; n <= 9 - 2 * l; n++){
                System.out.print("*");
            }
            System.out.print("
");
        }*/


        //求 1！+2！+3！+....+9!+10!
        /*int sum = 0;
        for(int i = 1; i <= 10; i++){
            int n = 1;
            for(int j = 1;j <= i;j++){
                n *= j;
            }
            sum += n;
        }
        System.out.print(sum);*/
        //判断素数
        /*System.out.println("请任意输入一个大于1的整数：");
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        boolean c = false;
        for(int i = 2;i <= n-1;i++){
            if(n % i==0){
                c = true;
            }
            }
            if(c){
                System.out.println("该数不是素数");
            }else{
                System.out.println("该数是素数");
            }*/
        //打印9*9乘法口诀表
        for(int i = 1;i<=9;i++){
            int n = 1;
            int j;
            for(j = 1; j<=i;j++){
                n = i * j;
                System.out.print(j+"*"+i+"="+ n+"	");
            }
            System.out.print("
");
        }
        //打印100-200之内的所有素数
        for(int i = 100; i<=200;i++){
            int j;
            for(j = 2; j<=i;j++){
                if(i%j==0){
                    if(i == j){
                        System.out.println(i); 
                    }
                    break;
                }
            }
        }