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<div class="section" id="demo-programs">
<span id="index-0"></span><h1>Demo Programs<a class="headerlink" href="#demo-programs" title="Permalink to this headline">¶</a></h1>
<p>In this chapter we will see simple demo programs</p>
<ul class="simple">
<li><p>Language Shell</p></li>
<li><p>Main Menu</p></li>
</ul>
<div class="section" id="language-shell">
<span id="index-1"></span><h2>Language Shell<a class="headerlink" href="#language-shell" title="Permalink to this headline">¶</a></h2>
<p>We can create simple interactive programming environment using the next program</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">while</span> <span class="kp">true</span>
<span class="k">see</span> <span class="n">nl</span> <span class="o">+</span> <span class="s">"code:> "</span>
<span class="k">give</span> <span class="n">cCode</span>
<span class="k">try</span>
<span class="n">eval</span><span class="p">(</span><span class="n">cCode</span><span class="p">)</span>
<span class="k">catch</span>
<span class="k">see</span> <span class="n">cCatchError</span>
<span class="k">done</span>
<span class="k">end</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="n">code</span><span class="p">:</span><span class="o">></span> <span class="k">see</span> <span class="s">"hello world"</span>
<span class="n">hello</span> <span class="n">world</span>
<span class="n">code</span><span class="p">:</span><span class="o">></span> <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">10</span> <span class="k">see</span> <span class="n">x</span> <span class="o">+</span> <span class="n">nl</span> <span class="k">next</span>
<span class="mi">1</span>
<span class="mi">2</span>
<span class="mi">3</span>
<span class="mi">4</span>
<span class="mi">5</span>
<span class="mi">6</span>
<span class="mi">7</span>
<span class="mi">8</span>
<span class="mi">9</span>
<span class="mi">10</span>
<span class="n">code</span><span class="p">:</span><span class="o">></span> <span class="k">func</span> <span class="n">test</span> <span class="k">see</span> <span class="s">"Hello from test"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="n">code</span><span class="p">:</span><span class="o">></span> <span class="n">test</span><span class="p">()</span>
<span class="n">Hello</span> <span class="k">from</span> <span class="n">test</span>
<span class="n">code</span><span class="p">:</span><span class="o">></span> <span class="k">bye</span>
</pre></div>
</div>
</div>
<div class="section" id="main-menu">
<span id="index-2"></span><h2>Main Menu<a class="headerlink" href="#main-menu" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="c"># Demo Program</span>
<span class="k">while</span> <span class="kp">true</span>
<span class="k">see</span> <span class="s">"</span>
<span class="n">Main</span> <span class="n">Menu</span>
<span class="o">===========</span>
<span class="o">[</span><span class="mi">1</span><span class="o">]</span> <span class="n">Say</span> <span class="n">Hello</span>
<span class="o">[</span><span class="mi">2</span><span class="o">]</span> <span class="n">Sum</span> <span class="n">two</span> <span class="n">numbers</span>
<span class="o">[</span><span class="mi">3</span><span class="o">]</span> <span class="n">Stars</span>
<span class="o">[</span><span class="mi">4</span><span class="o">]</span> <span class="n">Fact</span>
<span class="o">[</span><span class="mi">5</span><span class="o">]</span> <span class="k">Exit</span>
<span class="s">" give nMenu see nl</span>
<span class="c"># we can use Switch-ON-Other-OFF instead of IF-BUT-ELSE-OK</span>
<span class="k">Switch</span> <span class="n">nMenu</span>
<span class="k">On</span> <span class="mi">1</span> <span class="n">sayhello</span><span class="p">()</span>
<span class="k">On</span> <span class="mi">2</span> <span class="n">Sum</span><span class="p">()</span>
<span class="k">On</span> <span class="mi">3</span> <span class="n">Stars</span><span class="p">()</span>
<span class="k">On</span> <span class="mi">4</span>
<span class="k">see</span> <span class="s">"Enter Number : "</span> <span class="k">give</span> <span class="n">x</span>
<span class="k">see</span> <span class="s">"Output : "</span>
<span class="k">Try</span>
<span class="k">see</span> <span class="n">Fact</span><span class="p">(</span><span class="n">number</span><span class="p">(</span><span class="n">x</span><span class="p">))</span>
<span class="k">Catch</span>
<span class="k">see</span> <span class="s">"Error in parameters!"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">Done</span>
<span class="k">On</span> <span class="s">"5"</span> <span class="k">return</span>
<span class="k">Other</span> <span class="k">see</span> <span class="s">"bad option"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">Off</span>
<span class="k">end</span>
<span class="k">func</span> <span class="n">sayhello</span>
<span class="k">see</span> <span class="s">"Enter your name ? "</span> <span class="k">give</span> <span class="n">fname</span>
<span class="k">see</span> <span class="s">"Hello "</span> <span class="o">+</span> <span class="n">fname</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">func</span> <span class="n">sum</span>
<span class="k">see</span> <span class="s">"number 1 : "</span> <span class="k">give</span> <span class="n">num1</span> <span class="k">see</span> <span class="s">"number 2 : "</span> <span class="k">give</span> <span class="n">num2</span>
<span class="k">see</span> <span class="s">"Sum : "</span> <span class="k">see</span> <span class="mi">0</span> <span class="o">+</span> <span class="n">num1</span> <span class="o">+</span> <span class="n">num2</span>
<span class="k">func</span> <span class="n">stars</span>
<span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">10</span>
<span class="k">see</span> <span class="n">space</span><span class="p">(</span><span class="mi">8</span><span class="p">)</span>
<span class="k">for</span> <span class="n">y</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="n">x</span> <span class="k">see</span> <span class="s">"*"</span> <span class="k">next</span> <span class="k">see</span> <span class="n">nl</span>
<span class="k">next</span>
<span class="k">func</span> <span class="n">fact</span> <span class="n">x</span> <span class="k">if</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">return</span> <span class="mi">1</span> <span class="k">else</span> <span class="k">return</span> <span class="n">x</span> <span class="o">*</span> <span class="n">fact</span><span class="p">(</span><span class="n">x</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="k">ok</span>
<span class="k">func</span> <span class="n">space</span> <span class="n">x</span> <span class="n">y</span> <span class="o">=</span> <span class="s">""</span> <span class="k">for</span> <span class="n">t</span><span class="o">=</span><span class="mi">1</span> <span class="k">to</span> <span class="n">x</span> <span class="n">y</span> <span class="o">+=</span> <span class="s">" "</span> <span class="k">next</span> <span class="k">return</span> <span class="n">y</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span> <span class="n">Main</span> <span class="n">Menu</span>
<span class="o">===========</span>
<span class="o">[</span><span class="mi">1</span><span class="o">]</span> <span class="n">Say</span> <span class="n">Hello</span>
<span class="o">[</span><span class="mi">2</span><span class="o">]</span> <span class="n">Sum</span> <span class="n">two</span> <span class="n">numbers</span>
<span class="o">[</span><span class="mi">3</span><span class="o">]</span> <span class="n">Stars</span>
<span class="o">[</span><span class="mi">4</span><span class="o">]</span> <span class="n">Fact</span>
<span class="o">[</span><span class="mi">5</span><span class="o">]</span> <span class="k">Exit</span>
<span class="mi">1</span>
<span class="n">Enter</span> <span class="n">your</span> <span class="n">name</span> <span class="o">?</span> <span class="n">Mahmoud</span> <span class="n">Fayed</span>
<span class="n">Hello</span> <span class="n">Mahmoud</span> <span class="n">Fayed</span>
<span class="n">Main</span> <span class="n">Menu</span>
<span class="o">===========</span>
<span class="o">[</span><span class="mi">1</span><span class="o">]</span> <span class="n">Say</span> <span class="n">Hello</span>
<span class="o">[</span><span class="mi">2</span><span class="o">]</span> <span class="n">Sum</span> <span class="n">two</span> <span class="n">numbers</span>
<span class="o">[</span><span class="mi">3</span><span class="o">]</span> <span class="n">Stars</span>
<span class="o">[</span><span class="mi">4</span><span class="o">]</span> <span class="n">Fact</span>
<span class="o">[</span><span class="mi">5</span><span class="o">]</span> <span class="k">Exit</span>
<span class="mi">2</span>
<span class="n">number</span> <span class="mi">1</span> <span class="p">:</span> <span class="mi">3</span>
<span class="n">number</span> <span class="mi">2</span> <span class="p">:</span> <span class="mi">4</span>
<span class="n">Sum</span> <span class="p">:</span> <span class="mi">7</span>
<span class="n">Main</span> <span class="n">Menu</span>
<span class="o">===========</span>
<span class="o">[</span><span class="mi">1</span><span class="o">]</span> <span class="n">Say</span> <span class="n">Hello</span>
<span class="o">[</span><span class="mi">2</span><span class="o">]</span> <span class="n">Sum</span> <span class="n">two</span> <span class="n">numbers</span>
<span class="o">[</span><span class="mi">3</span><span class="o">]</span> <span class="n">Stars</span>
<span class="o">[</span><span class="mi">4</span><span class="o">]</span> <span class="n">Fact</span>
<span class="o">[</span><span class="mi">5</span><span class="o">]</span> <span class="k">Exit</span>
<span class="mi">3</span>
<span class="o">*</span>
<span class="o">**</span>
<span class="o">***</span>
<span class="o">****</span>
<span class="o">*****</span>
<span class="o">******</span>
<span class="o">*******</span>
<span class="o">********</span>
<span class="o">*********</span>
<span class="o">**********</span>
<span class="n">Main</span> <span class="n">Menu</span>
<span class="o">===========</span>
<span class="o">[</span><span class="mi">1</span><span class="o">]</span> <span class="n">Say</span> <span class="n">Hello</span>
<span class="o">[</span><span class="mi">2</span><span class="o">]</span> <span class="n">Sum</span> <span class="n">two</span> <span class="n">numbers</span>
<span class="o">[</span><span class="mi">3</span><span class="o">]</span> <span class="n">Stars</span>
<span class="o">[</span><span class="mi">4</span><span class="o">]</span> <span class="n">Fact</span>
<span class="o">[</span><span class="mi">5</span><span class="o">]</span> <span class="k">Exit</span>
<span class="mi">4</span>
<span class="n">Enter</span> <span class="n">Number</span> <span class="p">:</span> <span class="mi">5</span>
<span class="n">Output</span> <span class="p">:</span> <span class="mi">120</span>
<span class="n">Main</span> <span class="n">Menu</span>
<span class="o">===========</span>
<span class="o">[</span><span class="mi">1</span><span class="o">]</span> <span class="n">Say</span> <span class="n">Hello</span>
<span class="o">[</span><span class="mi">2</span><span class="o">]</span> <span class="n">Sum</span> <span class="n">two</span> <span class="n">numbers</span>
<span class="o">[</span><span class="mi">3</span><span class="o">]</span> <span class="n">Stars</span>
<span class="o">[</span><span class="mi">4</span><span class="o">]</span> <span class="n">Fact</span>
<span class="o">[</span><span class="mi">5</span><span class="o">]</span> <span class="k">Exit</span>
<span class="mi">5</span>
</pre></div>
</div>
</div>
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