Computer Programming C Laboratory: Unions C Programs

C Program to altering the allocated memory

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Dynamic Memory Allocation - C Programming

C Program to altering the allocated memory.

* C Program to altering the allocated memory */

#include <stdio.h>

#include <stdlib.h>

main()

{

char *p; /**p is a pointer variables */

p=(char *)malloc(6); /* malloc() allocate memory to variables */

strcpy(p, "MADRAS"); /* string copy */

printf("Memory contains: %s\n",p)

p=(char *)realloc(p, 7) /reallocation */

strcpy (p, "CHENNAI"); /* string copy */

printf("Memory now contains: %s\n", p);

free (p); /* Releasing memory*/

free(p);

} /* main */

OUTPUT

Memory contains: MADRAS

Memory now contains: CHENNAI

EXPLANATION: The function malloc() function 6 bytes are allocated to character pointer p. The character pointer is initialised with string MADRAS. To store more than 6 characters, we need to allocate more bytes to pointer 'p'. Using realloc() function memory, allocation takes place. After reallocation the pointer contains 7 bytes. The pointer p is again initialised with CHENNAI. The output display contents of p before and after reallocation. The free() function release the memory allocation.

Computer Programming C Laboratory: Unions C Programs : Tag: C Programming : - C Program to altering the allocated memory

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Computer Programming C Laboratory: Unions C Programs

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