Computer Programming C Laboratory: Pointers C Programs

Write a C program to demonstrate realloc() function (using pointers)

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using pointers - C Programming

Write a C program to demonstrate realloc() function.

/* C Program to demonstrate realloc() function */

#include <stdio.h>

#include <alloc.h>

#include <string.h>

int main(void)

{

/* Local definitions */

char *str;

str = (char *)malloc(10);

/* Statements */

strcpy(str, "BHAVANA"); /* string copy */

printf("String is %s\n Address is %p\n", str, str);

str = (char *) realloc(str, 20);

printf("String is %s\n New address is %p\n", str, str);

free(str); /* free the memory */

return 0;

} /* main */

OUTPUT

String is BHAVANA

Address is 05E4

String is BHAVANA

New address is 05F2

EXPLANATION: In the above program, using malloc() function 10 bytes are allocated to character str. The character pointer is initialised store more that 10 characters we need to allocate more bytes to pointer str using realloc() function memory reallocation takes place. After reallocation the pointer contains 20 bytes then prints the string str and address. The free() function releases the allocated memory.

Computer Programming C Laboratory: Pointers C Programs : Tag: C Programming : - Write a C program to demonstrate realloc() function (using pointers)

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Computer Programming C Laboratory: Pointers C Programs

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