Trace table

<h2 id="example">Example</h2>
int i, x = 0;
for (i = 1; i <= 10; i++) 
{
    x = i * 2;
}

<table><tbody><tr><th>i</th><th>x</th></tr><tr><td>?</td><td>0</td></tr><tr><td>1</td><td>2</td></tr><tr><td>2</td><td>4</td></tr><tr><td>3</td><td>6</td></tr><tr><td>4</td><td>8</td></tr><tr><td>5</td><td>10</td></tr><tr><td>6</td><td>12</td></tr><tr><td>7</td><td>14</td></tr><tr><td>8</td><td>16</td></tr><tr><td>9</td><td>18</td></tr><tr><td>10</td><td>20</td></tr><tr><td>11</td><td>20</td></tr></tbody></table>
<p>This example shows the systematic process that takes place whilst the algorithm is processed. The initial value of <i>x</i> is zero, but <i>i</i>, although defined, has not been assigned a value. Thus, its initial value is unknown. As we execute the program, line by line, the values of <i>i</i> and <i>x</i> change, reflecting each statement of the source code in execution. Their new values are recorded in the trace table. When <i>i</i> reaches the value of <i>11</i> because of the <i>i++</i> statement in the <i>for</i> definition, the comparison <i>i <= 10</i> evaluates to false, thus halting the loop. As we also reached the end of the program, the trace table also ends.
</p>
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Algorithms/fnl5NmRt">Algorithms</a></li>
<li><a href="/facts/Programming_languages/cWTYbgWa">Programming languages</a></li>
<li><a href="/facts/Debugging/QtdpPJT0">Debugging</a></li></ul>

<ul><li><a href="http://www.comscigate.com/tutorial/KjellStyle/WilliamChen/trace1.html">http://www.comscigate.com/tutorial/KjellStyle/WilliamChen/trace1.html</a></li>
<li><a href="http://www.thevickerage.worldonline.co.uk/theteacher/alevel/assem/assem5.htm">http://www.thevickerage.worldonline.co.uk/theteacher/alevel/assem/assem5.htm</a> - <a href="https://web.archive.org/web/20060114171149/http://www.thevickerage.worldonline.co.uk/theteacher/alevel/assem/assem5.htm">archived version</a></li>
<li><a href="http://portal.newman.wa.edu.au/technology/12infsys/html/KWH2003/TraceTables.htm">http://portal.newman.wa.edu.au/technology/12infsys/html/KWH2003/TraceTables.htm</a> - <a href="https://web.archive.org/web/20110824235337/http://portal.newman.wa.edu.au/technology/12infsys/html/KWH2003/TraceTables.htm">archived version</a></li></ul>

Trace table open-in-new

Trace table