Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You can't do range tests like this:</p> <pre><code>'a' &lt;= msg[i] &lt;= 'z' </code></pre> <p>This evaluates as <code>'a' &lt;= msg[i]</code> becomes true or false (1 or 0), which is always less than <code>'z'</code>.</p> <p>So to start you need:</p> <pre><code>( msg[i] &gt;= 'a' &amp;&amp; msg[i] &lt;= 'z' || msg[i] &gt;= 'A' &amp;&amp; msg[i] &lt;= 'Z' ) </code></pre> <p>Now, you have put this condition on your loop, so it will terminate as soon as you encounter a special character. If you want to have different behaviour for letters, check them inside the loop:</p> <pre><code>for( i = 0; msg[i] != 0; i++ ) { if( msg[i] &gt;= 'a' &amp;&amp; msg[i] &lt;= 'z' || msg[i] &gt;= 'A' &amp;&amp; msg[i] &lt;= 'Z' ) { encrypted[i] = msg[i] + key; } else { encrypted[i] = msg[i]; } } </code></pre> <p>Now the second part of your question. You appear to want to rotate your letters. Try this:</p> <pre><code>// Sanity -- to avoid overflowing `char` key %= 26; while( key &lt; 0 ) key += 26; for( i = 0; msg[i] != 0; i++ ) { if( msg[i] &gt;= 'a' &amp;&amp; msg[i] &lt;= 'z' ) { encrypted[i] = 'a' + ((msg[i]-'a' + key) % 26); } else if( msg[i] &gt;= 'A' &amp;&amp; msg[i] &lt;= 'Z' ) { encrypted[i] = 'A' + ((msg[i]-'A' + key) % 26); } else { encrypted[i] = msg[i]; } } </code></pre> <p>If you don't want non-letters in the encrypted string at all, then make another index:</p> <pre><code>int e = 0; encrypted[e++] = etc; // Only when you want to add something to the string. </code></pre> <p>And don't forget after the loop:</p> <pre><code>encrypted[e] = 0; // terminate string. </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POHow to ignore special characters when incrementing and how to use % to loop through ASCII?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USpaddy
    1. USpaddy
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COTHANK YOU SOOO MUCH!!! If it wouldn't be too much to ask, could you explain it slightly please. just the %= bit and encrypted[i] = 'a' + ((msg[i]-'a' + key) % 26); and the elseif statement. Thanks. Sorry im a bit of a noob. Just started programming and trying to learn.
      singulars
      1. PO
      1. USNeXtMaN_786
    2. COYou subtract the first letter of the range, so `'a'` becomes `0`. Your letters are now numbered 0 to 25. Then you add the key and take modulo by 26 so that it remains in the range 0 to 25. Finally, you add `'a'` back on to make it the correct character again. You operate on the lower- and uppercase ranges individually.
      singulars
      1. PO
      1. USpaddy
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload