C 語言列印倒三角形



所有邊相等的三角形稱為等邊三角形。我們現在將瞭解如何在等邊三角形形狀,但顛倒過來列印星星 *。

演算法

演算法應如下所示 −

Step 1 - Take number of rows to be printed, n.
Step 2 - Make an iteration for n times
Step 3 - Print " " (space) for in decreasing order from 1 to n-1
Step 4 - Print "* " (start, space) in increasing order from 1 to I
Step 5 - Return

虛擬碼

我們可以為上述演算法匯出虛擬碼,如下 −

procedure upsidedown_triangle

   FOR I = 1 to N DO
      FOR J = 1 to N-I DO
         PRINT " "
      END FOR
      
      FOR J = 1 to I DO
         PRINT "* " 
      END FOR
   END FOR
   
end procedure

實施

在 C 中實施倒置等邊三角形的程式碼如下 −

#include <stdio.h>

int main() {
   int n,i,j;

   n = 5;

   for(i = 1; i <= n; i++) {
      for(j = 1; j < i; j++)
         printf(" "); 

      for(j = i; j <= n; j++)
         printf("* ");

      printf("\n");
   }

   return 1;
}

輸出應如下所示 −

* * * * *
 * * * *
  * * *
   * *
    * 
patterns_examples_in_c.htm
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