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  <div class="section" id="demo-programs">
<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>Language Shell</li>
<li>Main Menu</li>
</ul>
<div class="section" id="language-shell">
<span id="index-0"></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-none"><div class="highlight"><pre>while true
        see nl + &quot;code:&gt; &quot;
        give cCode
        try
                eval(cCode)
        catch
                see cCatchError
        done
end
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-none"><div class="highlight"><pre>code:&gt; see &quot;hello world&quot;
hello world
code:&gt; for x = 1 to 10 see x + nl next
1
2
3
4
5
6
7
8
9
10

code:&gt; func test see &quot;Hello from test&quot; + nl

code:&gt; test()
Hello from test

code:&gt; bye
</pre></div>
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</div>
<div class="section" id="main-menu">
<span id="index-1"></span><h2>Main Menu<a class="headerlink" href="#main-menu" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-none"><div class="highlight"><pre># Demo Program

while true

        see &quot;

        Main Menu
        ===========
        [1] Say Hello
        [2] Sum two numbers
        [3] Stars
        [4] Fact
        [5] Exit

        &quot; give nMenu see nl

        # we can use Switch-ON-Other-OFF instead of IF-BUT-ELSE-OK

        if nMenu = 1 sayhello()
        but nMenu = 2 Sum()
        but nMenu = 3 Stars()
        but nMenu = 4
                see &quot;Enter Number : &quot; give x
                see &quot;Output : &quot;

                Try
                        see Fact(number(x))
                Catch
                        see &quot;Error in parameters!&quot; + nl
                Done

        but nMenu = &quot;5&quot; return
        else see &quot;bad option&quot; + nl
        ok

end

func sayhello
        see &quot;Enter your name ? &quot; give fname
        see &quot;Hello &quot; + fname + nl

func sum
        see &quot;number 1 : &quot; give num1 see &quot;number 2 : &quot; give num2
        see &quot;Sum : &quot; see 0 + num1 + num2

func stars
        for x = 1 to 10
                see space(8)
                for y = 1 to x see &quot;*&quot; next see nl
        next

func fact x if x = 1 return 1 else return x * fact(x-1) ok

func space x y = &quot;&quot; for t=1 to x y += &quot; &quot; next return y
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-none"><div class="highlight"><pre>        Main Menu
        ===========
        [1] Say Hello
        [2] Sum two numbers
        [3] Stars
        [4] Fact
        [5] Exit

        1

Enter your name ? Mahmoud Fayed
Hello Mahmoud Fayed


        Main Menu
        ===========
        [1] Say Hello
        [2] Sum two numbers
        [3] Stars
        [4] Fact
        [5] Exit

        2

number 1 : 3
number 2 : 4
Sum : 7

        Main Menu
        ===========
        [1] Say Hello
        [2] Sum two numbers
        [3] Stars
        [4] Fact
        [5] Exit

        3

        *
        **
        ***
        ****
        *****
        ******
        *******
        ********
        *********
        **********


        Main Menu
        ===========
        [1] Say Hello
        [2] Sum two numbers
        [3] Stars
        [4] Fact
        [5] Exit

        4

Enter Number : 5
Output : 120

        Main Menu
        ===========
        [1] Say Hello
        [2] Sum two numbers
        [3] Stars
        [4] Fact
        [5] Exit

        5
</pre></div>
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  <h3><a href="index.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">Demo Programs</a><ul>
<li><a class="reference internal" href="#language-shell">Language Shell</a></li>
<li><a class="reference internal" href="#main-menu">Main Menu</a></li>
</ul>
</li>
</ul>

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