Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>To print all bytes in an <code>int</code>? Remember that an <code>int</code> is 32-bit, which is four bytes. Reading it into a <code>char</code> buffer makes it easier to access those four bytes in the <code>int</code>.</p> <p><strong>Edit:</strong> Little explanation of the <code>int</code> type...</p> <p>Lets say you have an <code>int</code>:</p> <pre><code>int someIntValue = 0x12345678; </code></pre> <p>This is stored in 32 bits in the memory. As a single byte (<code>char</code>) is 8 bits, there are four bytes to an <code>int</code>. Each byte in the <code>int</code> can be accessed by using a <code>char</code> array or pointer:</p> <pre><code>char *someCharPointer = (char *) &amp;someIntValue; </code></pre> <p>Now you can access those four separate bytes, and see their values:</p> <pre><code>for (int i = 0; i &lt; sizeof(int); i++) printf("someCharPointer[%d] = 0x%02x\n", i, someCharPointer[i]); </code></pre> <p>The above will print (on a little-endian machine such as x86):</p> <pre> someCharPointer[0] = 0x78 someCharPointer[1] = 0x56 someCharPointer[2] = 0x34 someCharPointer[3] = 0x12 </pre> <p>If you now change <code>someIntValue</code> to the number <code>1</code></p> <pre><code>someIntValue = 1; </code></pre> <p>and print it out again, you will see <em>this</em> result:</p> <pre> someCharPointer[0] = 0x00 someCharPointer[1] = 0x00 someCharPointer[2] = 0x00 someCharPointer[3] = 0x01 </pre> <h2>Memory layout of an <code>int</code></h2> <p>If you have a variable of type <code>int</code> stored in memory with the value <code>0x12345678</code>, it's stored like this:</p> <pre> 8 bits ,----^---. | | +--------+--------+--------+--------+ |00111000|01010110|00110100|00010010| +--------+--------+--------+--------+ | | `-----------------v-----------------' | 32 bits </pre> <p>This <code>int</code> is the same as the four bytes (or <code>char</code>) <code>0x78</code>, <code>0x56</code>, <code>0x34</code> and <code>0x12</code>.</p> <p>However if we change the <code>int</code> to the number <code>1</code> then it's stored like this:</p> <pre> 8 bits ,----^---. | | +--------+--------+--------+--------+ |00000000|00000000|00000000|00000001| +--------+--------+--------+--------+ | | `-----------------v-----------------' | 32 bits </pre> <p>This <code>int</code> is the same as the four bytes (or <code>char</code>) <code>0x00</code>, <code>0x00</code>, <code>0x00</code> and <code>0x01</code>.</p> <p>So now you hopefully can see how reading as an <code>int</code> and printing as <code>char</code> will display a different result from reading and <code>int</code> and printing it as an <code>int</code>.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow a fread function work?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USSome programmer dude
    1. USSome programmer dude
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow a fread function work?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COwhen i am using int instead of char i am not getting the ans...?
      singulars
      1. PO
      1. USShivam Dhabhai
    2. CO@user1781308 `int` != `char`. Please tell what you want to do instead of just showing some piece of code and letting us guess. What is the expected result? What is the actual result?
      singulars
      1. PO
      1. USSome programmer dude
    3. COi am just trying to figure out the use of fread function..to read data from stdin.
      singulars
      1. PO
      1. USShivam Dhabhai
 

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