矩形：（裡面是空的）

*******

*     *

*     *

*     *

*******

Program ended with exit code: 0

    for (int i = 0; i < 5; i ++) {
        for (int j = 0; j < 7;  j ++) {
            //用條件判斷打出*號
            if (i == 0 || i == 4 || j == 0 || j == 6  ) {
                printf("*");
            }else{
               printf(" ");
            }
        }
        printf("\n");
    }
    
 

    *

   **

  ***

 ****

*****

下一個圖案

    *

   ***

  *****

 *******

*********

下一個圖案

    *

   ***

  *****

 *******

*********

 *******

  *****

   ***

    *

下一個圖案

菱形的另一種列印

Hello, World!

Program ended with exit code: 0

    /*
         *
        **
       ***
      ****
     *****
     */
    int n=5,a;
    for(int i = 1;i <= n;i ++){
        a=n-i;
        for (int j =i;j<n;j++){
            printf(" ");
        }
        for (int j = a; j < n; j ++) {
            printf("*");
        }
        printf("\n");
    }
    printf("下一個圖案\n");
    /*
     
         *
        ***
       *****
      *******
     *********
     
     */
    for (int i = 0; i <= n; i ++) {
        for (int j =i; j<n; j ++) {
            printf(" ");
        }
        for(int j =0;j<2*i-1;j++){
            printf("*");
        }
        printf("\n");
    }
    printf("下一個圖案\n");
    /*
        *
       ***
      *****
     *******
    *********
     *******
      *****
       ***
        *
     
     
     */
    for (int i = 1; i <= n; i ++) {
        for (int j =i; j<n; j ++) {
            printf(" ");
        }
        for(int j =0;j<2*i-1;j++){
            printf("*");
        }
        printf("\n");
    }
    for (int i = 1; i <= n; i ++) {
         a=n-i;
        for(int j = a;j < n;j++){
            printf(" ");
        }
        for(int j =0;j<2*a-1;j++){
            printf("*");
        }
        printf("\n");
        
    }
    printf("下一個圖案\n");
    printf("菱形的另一種列印\n");

    printf("\n");
    printf("Hello, World!\n");
//    return 0;
}