{{keywords>wiki library source code example reference}}
===== sizeof =====
<code c>
#include <stdlib.h>

    int sizeof(VALUE);
</code>    
    sizeof operator returns the number of bytes to be reserved for a variable or a data type.

===== C Sourcecode Example =====    
<code c>
#include <stdio.h> /* including standard library */
#include <stdlib.h>
//#include <windows.h> /* uncomment this for Windows */


int main(void){

printf("int:         %d bytes\n", sizeof(int) );
printf("Hello World: %d bytes\n", sizeof("Hello World") );

return 0;
}

</code>

==== Output ====

    Output:
    user@host:~$ ./sizeof 
    int:         4 bytes
    Hello World: 12 bytes