IT. Expert System.

C

free ()


free () function frees the allocated memory by malloc (), calloc (), realloc () functions and returns the memory to the system.

Syntax:
free(ptr);


Example:

#include 
#include 
#include 

int main()
{
    char *mem_allocation;
    /* memory is allocated dynamically */
    mem_allocation = malloc( 20 * sizeof(char) );
    if( mem_allocation == NULL )
    {
        printf("Couldn't able to allocate requested memory\n");
    }
    else
    {
       strcpy( mem_allocation,"technicia.in");
    }
    printf("Dynamically allocated memory content  : " \
           "%s\n", mem_allocation );
    mem_allocation=realloc(mem_allocation,100*sizeof(char));
    if( mem_allocation == NULL )
    {
        printf("Couldn't able to allocate requested memory\n");
    }
    else
    {
        strcpy( mem_allocation,"space is extended upto " \
                               "100 characters");
    }
    printf("Resized memory : %s\n", mem_allocation );
    free(mem_allocation);
}
Output:

Dynamically allocated memory content : technicia.in
Resized memory : space is extended upto 100 characters


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