Working with Memory Segments - C Memory

Introduction

Memory acquired by malloc() can be treated much like array members.

These memory segments can be referenced with indexes.

Demo Code

#include <stdio.h> 
#include <stdlib.h> 
int main()/*from  w ww  . java2  s . c o  m*/
{
   int *numbers;
   int x;
   numbers = (int *)malloc(5 * sizeof(int));
   if (numbers == NULL)
      return 1;  // return if malloc is not successful 
   numbers[0] = 1;
   numbers[1] = 2;
   numbers[2] = 3;
   numbers[3] = 4;
   numbers[4] = 5;
   printf("\nIndividual memory segments initialized to:\n");
   for (x = 0; x < 5; x++)
      printf("numbers[%d] = %d\n", x, numbers[x]);

   return 0;
}

Result

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Related Tutorials

• malloc() attempts to retrieve designated memory segments from the heap and returns a pointer for the memory reserved.
• Check that malloc() was successful before attempting to use the memory.
• Using malloc() to create and read strings from standard input
• Creating dynamic memory by setting the size of the data type for which we are requesting memory.
• Loops through all the numbers in array and figures out the smallest, the biggest, and the average. It then frees the memory.