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<div id="content" class="content">
<h1 class="title">Simple cobol "SCREEN" to display and get keyboard input.</h1>
<p>
This example below uses gnuCOBOL's idea of "SCREENS". Screens are method of displaying
ncurses/curses style displays with labels and keyboard inputs (I read that mouse inputs
may be possible, but not in this demo.)
</p>
<p>
This code may work on other versions of COBOL, but I have not tested. I'm going to use
CAPS in my code, deal with it.
</p>
<p>
Below is the complete program that can be compiled at the shell with the command line:
</p>
<div class="org-src-container">
<pre class="src src-sh">cobc -xF simple-question.cob -o simple-question
</pre>
</div>
<p>
And the cobol code:
</p>
<div class="org-src-container">
<pre class="src src-cobol"><span class="linenr"> 1: </span><span style="color: #b22222;">IDENTI</span>FICATION <span style="color: #a020f0;">DIVISION</span>.
<span class="linenr"> 2: </span><span style="color: #b22222;">PROGRA</span>M<span style="color: #0000ff;">-ID</span>. SAMPLE.
<span class="linenr"> 3: </span>
<span class="linenr"> 4: </span><span style="color: #b22222;">ENVIRO</span>NMENT <span style="color: #a020f0;">DIVISION</span>.
<span class="linenr"> 5: </span><span style="color: #b22222;">CONFIG</span>U<span style="color: #0000ff;">RATION</span> <span style="color: #a020f0;">SECTION</span>.
<span class="linenr"> 6: </span><span style="color: #b22222;">SPECIA</span>L<span style="color: #0000ff;">-NAMES</span>.
<span class="linenr"> 7: </span>
<span class="linenr"> 8: </span><span style="color: #b22222;">INPUT-</span>O<span style="color: #0000ff;">UTPUT</span> <span style="color: #a020f0;">SECTION</span>.
<span class="linenr"> 9: </span><span style="color: #b22222;">FILE-C</span>O<span style="color: #0000ff;">NTROL</span>.
<span class="linenr">10: </span>
<span class="linenr">11: </span><span style="color: #b22222;">DATA D</span>I<span style="color: #0000ff;">VISION</span>.
<span class="linenr">12: </span><span style="color: #b22222;">FILE S</span>E<span style="color: #0000ff;">CTION</span>.
<span class="linenr">13: </span>
<span class="linenr">14: </span><span style="color: #b22222;">WORKIN</span>G<span style="color: #0000ff;">-STORAGE</span> <span style="color: #a020f0;">SECTION</span>.
<span class="linenr">15: </span><span style="color: #b22222;">01 RE</span>S<span style="color: #0000ff;">PONSE</span>.
<span class="linenr">16: </span><span style="color: #b22222;"> 05 </span>RESPONSE-IN-WS <span style="color: #a020f0;">PIC</span> <span style="color: #228b22;">X</span><span style="color: #707183;">(</span><span style="color: #228b22;">2</span><span style="color: #707183;">)</span>.
<span class="linenr">17: </span>
<span class="linenr">18: </span><span style="color: #b22222;">SCREEN</span> <span style="color: #a020f0;">SECTION</span>.
<span class="linenr">19: </span><span style="color: #b22222;">01 SIM</span>P<span style="color: #0000ff;">LE-QUESTION-SCREEN</span>.
<span class="linenr">20: </span><span style="color: #b22222;"> 05 </span> <span style="color: #a020f0;">VALUE</span> <span style="color: #8b2252;">"SIMPLE QUESTION SCREEN"</span> <span style="color: #a020f0;">BLANK</span> <span style="color: #a020f0;">SCREEN</span> <span style="color: #a020f0;">LINE</span> 1 <span style="color: #a020f0;">COL</span> 35.
<span class="linenr">21: </span><span style="color: #b22222;"> 05 </span> <span style="color: #a020f0;">VALUE</span> <span style="color: #8b2252;">"ANSWER YES OR NO! Y/N: "</span> <span style="color: #a020f0;">LINE</span> 2 <span style="color: #a020f0;">COL</span> 1.
<span class="linenr">22: </span><span style="color: #b22222;"> 05 </span> RESPONSE-INPUT <span style="color: #a020f0;">LINE</span> 2 <span style="color: #a020f0;">COL</span> 25
<span class="linenr">23: </span><span style="color: #b22222;"> </span> <span style="color: #a020f0;">PIC</span> <span style="color: #228b22;">X</span> <span style="color: #a020f0;">TO</span> RESPONSE-IN-WS.
<span class="linenr">24: </span>
<span class="linenr">25: </span><span style="color: #b22222;">PROCED</span>URE <span style="color: #a020f0;">DIVISION</span>.
<span class="linenr">26: </span><span style="color: #b22222;"> DIS</span>PLAY SIMPLE-QUESTION-SCREEN.
<span class="linenr">27: </span><span style="color: #b22222;"> ACC</span>EPT SIMPLE-QUESTION-SCREEN.
<span class="linenr">28: </span><span style="color: #b22222;"> STO</span>P <span style="color: #a020f0;">RUN</span>.
<span class="linenr">29: </span>
</pre>
</div>
<p>
Starting at the "meat" of the demonstration, the "SCREEN SECTION".
</p>
<div class="org-src-container">
<pre class="src src-cobol"><span class="linenr">18: </span><span style="color: #b22222;">SCREEN</span> <span style="color: #a020f0;">SECTION</span>.
<span class="linenr">19: </span><span style="color: #b22222;">01 SIM</span>P<span style="color: #0000ff;">LE-QUESTION-SCREEN</span>.
<span class="linenr">20: </span><span style="color: #b22222;"> 05 </span> <span style="color: #a020f0;">VALUE</span> <span style="color: #8b2252;">"SIMPLE QUESTION SCREEN"</span> <span style="color: #a020f0;">BLANK</span> <span style="color: #a020f0;">SCREEN</span> <span style="color: #a020f0;">LINE</span> 1 <span style="color: #a020f0;">COL</span> 35.
<span class="linenr">21: </span><span style="color: #b22222;"> 05 </span> <span style="color: #a020f0;">VALUE</span> <span style="color: #8b2252;">"ANSWER YES OR NO! Y/N: "</span> <span style="color: #a020f0;">LINE</span> 2 <span style="color: #a020f0;">COL</span> 1.
<span class="linenr">22: </span><span style="color: #b22222;"> 05 </span> RESPONSE-INPUT <span style="color: #a020f0;">LINE</span> 2 <span style="color: #a020f0;">COL</span> 25
<span class="linenr">23: </span><span style="color: #b22222;"> </span> <span style="color: #a020f0;">PIC</span> <span style="color: #228b22;">X</span> <span style="color: #a020f0;">TO</span> RESPONSE-IN-WS.
</pre>
</div>
<p>
The "SCREEN SECTION" is instructions for the "DISPLAY" function to layout and handle basic layout on the screen. Specific line and column need to be specified to ensure that the labels and input boxes are exactly as requested. (PROTIP: draw them out in a text editor with fixed width fonts before coding up a screen, it will save you time in more complex scenarios.)
</p>
<div class="org-src-container">
<pre class="src src-COBOL"><span class="linenr">25: </span>PROCEDURE DIVISION.
<span class="linenr">26: </span> DISPLAY SIMPLE-QUESTION-SCREEN.
<span class="linenr">27: </span> ACCEPT SIMPLE-QUESTION-SCREEN
</pre>
</div>
<p>
The "DISPLAY" function shows the screen. The "ACCEPT" function deals with the inputs
from the user. In this case it is simply a Y/N answer and the result is stored in "RESPONSE-IN-WS".
</p>
<p>
It is useful to know that you may wish to create more complex interfaces where you could
call multiple DISPLAYS, even though part of them may not be interactive at this stage
in the program.
</p>
<p>
NB. I'm gradually improving my understanding of "State" diagrams that many cobol sites used to explain
the function diagrams. These are not intuitive and must be understood to grow as a developer.
</p>
<p>
And the final running example:
</p>
<div id="orgd627818" class="figure">
<p><img src="https://imgur.com/QceI3Rvl.png" alt="QceI3Rvl.png" />
</p>
</div>
<div id="outline-container-orgd704e32" class="outline-2">
<h2 id="orgd704e32">Resources:</h2>
<div class="outline-text-2" id="text-orgd704e32">
<ul class="org-ul">
<li><a href="https://gnucobol.sourceforge.io/HTML/gnucobpg.html#SCREEN-SECTION">gnuCOBOL SCREEN section</a></li>
<li><a href="http://savannah.gnu.org/forum/forum.php?forum_id=9910">Changelog showing 'initial mouse support' in gnuCobol screen io.</a></li>
</ul>
</div>
</div>
</div>
</body>
</html>