Write a C Program for dynamic memory allocation using malloc( )

DYNAMIC MEMORY ALLOCATION :

The process of allocating memory during program execution is called dynamic memory allocation.

Library routines known as “memory management functions” are used for allocating and freeing memory during execution of a program. These functions are defined in stdlib.h.

 MALLOC() FUNCTION IN C:

• malloc () function is used to allocate space in memory during the execution of the program.

• malloc () does not initialize the memory allocated during execution.  It carries garbage value.

• malloc () function returns null pointer if it couldn’t able to allocate requested amount of memory.

 Syntax of malloc( ) function :

 ptr = (cast-type *)malloc(byte-size) ;

Below is the source code for C Program to understand dynamic memory allocation using malloc( ) which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/* Program to understand dynamic memory allocation*/

#include<stdio.h>
#include<stdlib.h>

int main( )
{
        int *p, n, i;
        printf("Enter the number of integers to be entered : ");
        scanf("%d", &n);
        p = (int *)malloc(n * sizeof(int));
        if(p==NULL)
        {
                printf("Memory not available\n");
                exit(1);
        }
        for(i=0; i<n; i++)
        {
                printf("Enter an integer : ");
                scanf("%d", p+i);
        }
        for(i=0; i<n; i++)
                printf("%d\t", *(p+i));

                return 0;

}

OUTPUT : :

//OUTPUT :

Enter the number of integers to be entered : 6
Enter an integer : 5
Enter an integer : 2
Enter an integer : 8
Enter an integer : 1
Enter an integer : 9
Enter an integer : 7
5       2       8       1       9       7

Process returned 0