Lab46 Wiki

dynamic memory allocation (malloc/free)

dynamic memory allocation is the task of allocating a free chunk of memory specific to the size you predetermine in bytes, by using the malloc function. The chunk of memory is not always in the same location hence being “dynamic” instead of static. By using the “free” function, that will release the block of memory back to the system.

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

• wikipedia
• class
• Reference 3

passing by address (function parameter passing)

Passing by address is just one of the ways that you pass a variable into a function. This is done not by passing the variable itself, but by passing the variable address. The only uses for this type of variable passing that I have encountered are arrays.

• http://www.learncpp.com/cpp-tutorial/74-passing-arguments-by-address/

Demonstration of the indicated keyword.

If you wish to aid your definition with a code sample, you can do so by using a wiki code block, an example follows:

#include <stdio.h>
void tripnum(int *x)
{
*x = (*x) * (*x) * (*x);
}
 
int main ( )
{
int num = 10;
tripnum(&num);
printf(" Value of num is %d\n”, num); // Value of num is 1000
return (0);
}

Alternatively (or additionally), if you want to demonstrate something on the command-line, you can do so as follows:

lab46:~/src$ gcc -otripnum tripnum.c
lab46:~/src$ ./tripnum
 Value of num is 1000