Print right angle triangle, isosceles triangle, diamond

One 、 Print right angle triangle

 System.out.println(" Print right angle triangle ");
        for (int i = 1; i <=3; i++) {
            for (int j = 1; j <=i ; j++) {
                System.out.print("*");
            }
            System.out.println();
        }

Two 、 Enter the height of the right triangle from the console

Each row * The number of is 1、3、5、7…

System.out.println(" Please enter the number of rows of right angle triangle ：");
        int hang=sc.nextInt();
        for (int i = 1; i <= hang; i++) {
            for (int j = 1; j <= i *2- 1; j++) {
                System.out.print("*");
            }
            System.out.println();
        }

3、 ... and 、 Print inverted right triangle , According to console input

System.out.println(" Please enter the number of rows of inverted right angle triangle ：");
        int hang=sc.nextInt();
        for (int i = 0; i < hang; i++) {
            for (int j =hang; j >i;j--) {
                System.out.print("*");
            }
            System.out.println();
        }

Four 、 Print isosceles triangle , According to console input

System.out.println(" Please enter the number of rows of isosceles triangle ：");
        int number=sc.nextInt();
        for (int i=1;i<=number;i++){
         for (int j=number;j>=i;j--){
                System.out.print(" ");
            }
            for (int k=1;k<=2*i-1;k++){
                System.out.print("*");
            }
            System.out.println();
        }

5、 ... and 、 Print diamond , If the number of lines entered by the user is odd , Then print out the diamond ; Otherwise, the user will be prompted to enter an odd number

 System.out.println(" Please enter the number of diamond rows ：");
        int rows=0;
        rows = sc.nextInt();
        while (rows%2==0){
            System.out.println(" Please enter an odd number ：");
             rows=sc.nextInt();
        }
        int number=(rows+1)/2;
        // Print the top half of the diamond 
        for(int i = 1; i <= number; i++){// Outer loop variables i Control the number of lines 
            for(int j = 1; j <= number-i; j++){// Inner loop variables j Control the number of spaces in this line 
                System.out.print(" ");
            }
            for(int k = 1; k <= 2*i-1; k++){// Inner loop variables k Control this line * Number 
                System.out.print("*");
            }
            System.out.print("\n");
        }
        // Print the lower half of the diamond 
        for(int i = number-1; i >= 1; i--) {
            for (int j = 1; j <= number - i; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k <= 2 * i - 1; k++) {
                System.out.print("*");
            }
            System.out.print("\n");

        }