Golang Program To Print Mirror Lower Star Triangle Pattern

In this tutorial, we will learn how to print the mirror lower star triangle pattern using G programming language.

Syntax

for initialization; condition; update {
   statement(s)
}

In the code, we use the for loop to repeat a block of code until the specified condition is met.

Example: Golang Program to Print Mirror Lower Star Triangle pattern using One Single Function

Algorithm

• Step 1 ? Import the package fmt.

• Step 2 ? Start the function main ().

• Step 3 ? Declare and initialize the variables.

• Step 4 ? Use of for loop with condition and incrementor.

• Step 5 ? Print the result using fmt.Println ().

Example

<div class="execute"></div><div class="code-mirror  language-java" contenteditable="plaintext-only" spellcheck="false" style="outline: none; overflow-wrap: break-word; overflow-y: auto; white-space: pre-wrap;"><span class="token comment">// GOLANG PROGRAM TO PRINT MIRROR LOWER STAR TRIANGLE PATTERN</span>
<span class="token keyword">package</span> <span class="token namespace">main</span>

<span class="token comment">// fmt package provides the function to print anything</span>
<span class="token keyword">import</span> <span class="token string">"fmt"</span>
func <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token class-name"><span class="token namespace">fmt<span class="token punctuation">.</span></span>Println</span><span class="token punctuation">(</span><span class="token string">"GOLANG PROGRAM TO PRINT MIRROR LOWER STAR TRIANGLE PATTERN"</span><span class="token punctuation">)</span>
   
   <span class="token comment">// declare the variables</span>
   <span class="token keyword">var</span> i <span class="token keyword">int</span>
   <span class="token keyword">var</span> j <span class="token keyword">int</span>
   <span class="token keyword">var</span> row <span class="token keyword">int</span>
   
   <span class="token comment">// initialize the variables</span>
   row <span class="token operator">=</span> <span class="token number">8</span>
   
   <span class="token comment">//Outer loop 1</span>
   <span class="token comment">// prints the first half triangle GOLANG PROGRAM TO PRINT MIRROR LOWER STAR TRIANGLE PATTERN</span>
   <span class="token keyword">for</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><=</span> row<span class="token punctuation">;</span> i<span class="token operator">++</span> <span class="token punctuation">{</span>
   
      <span class="token comment">//inner loop 1</span>
      <span class="token keyword">for</span> j <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> j <span class="token operator"><</span> i<span class="token punctuation">;</span> j<span class="token operator">++</span> <span class="token punctuation">{</span>
         <span class="token comment">//prints space between two stars</span>
         <span class="token class-name"><span class="token namespace">fmt<span class="token punctuation">.</span></span>Print</span><span class="token punctuation">(</span><span class="token string">" "</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
      
      <span class="token comment">// Inner loop 2</span>
      <span class="token keyword">for</span> j <span class="token operator">=</span> i<span class="token punctuation">;</span> j <span class="token operator"><=</span> row<span class="token punctuation">;</span> j<span class="token operator">++</span> <span class="token punctuation">{</span>
         <span class="token comment">// Print star</span>
         <span class="token class-name"><span class="token namespace">fmt<span class="token punctuation">.</span></span>Print</span><span class="token punctuation">(</span><span class="token string">"*"</span> <span class="token operator">+</span> <span class="token string">" "</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
      
      <span class="token comment">// Ending line after each row</span>
      <span class="token class-name"><span class="token namespace">fmt<span class="token punctuation">.</span></span>Println</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
   <span class="token punctuation">}</span>
   <span class="token comment">// Outer loop 2</span>
   <span class="token comment">// prints the second half triangle</span>
   <span class="token keyword">for</span> i <span class="token operator">=</span> row <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">>=</span> <span class="token number">0</span><span class="token punctuation">;</span> i<span class="token operator">--</span> <span class="token punctuation">{</span>
   
      <span class="token comment">// Inner loop 1</span>
      <span class="token keyword">for</span> j <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> j <span class="token operator"><</span> i<span class="token punctuation">;</span> j<span class="token operator">++</span> <span class="token punctuation">{</span>
         <span class="token comment">// Print whitespace</span>
         <span class="token class-name"><span class="token namespace">fmt<span class="token punctuation">.</span></span>Print</span><span class="token punctuation">(</span><span class="token string">" "</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
      
      <span class="token comment">// Inner loop 2</span>
      <span class="token keyword">for</span> j <span class="token operator">=</span> i<span class="token punctuation">;</span> j <span class="token operator"><=</span> row<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span> j<span class="token operator">++</span> <span class="token punctuation">{</span>
         <span class="token comment">// Print star</span>
         <span class="token class-name"><span class="token namespace">fmt<span class="token punctuation">.</span></span>Print</span><span class="token punctuation">(</span><span class="token string">"*"</span> <span class="token operator">+</span> <span class="token string">" "</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
      
      <span class="token comment">// Ending line after each row</span>
      <span class="token class-name"><span class="token namespace">fmt<span class="token punctuation">.</span></span>Println</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
   <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</div><div class="output-wrapper"><div class="console-close"></div><div class="code-output"></div></div>

Output

GOLANG PROGRAM TO PRINT MIRROR LOWER STAR TRIANGLE PATTERN
* * * * * * * * * 
* * * * * * * * 
 * * * * * * * 
  * * * * * * 
   * * * * * 
    * * * * 
     * * * 
      * * 
       * 
       * 
      * * 
     * * * 
    * * * * 
   * * * * * 
  * * * * * * 
 * * * * * * * 
* * * * * * * * 

Description Of The Code

• In the above program, we first declare the package main.

• We imported the fmt package that includes the files of package fmt.

• Now start the function main ().

• Declare the three integer variables i, j and row. Initialize the row variable to an integer value you want for the number of rows of the lower mirror star triangle pattern.

• Using for loop ? The condition is given inside an if statement and stop execution is mentioned once the condition is right.

• And last printing the result using fmt.Println().

Conclusion

We have successfully compiled and executed the Golang program code to print the mirror lower star triangle pattern in the above example.