realloc : realloc « stdlib.h « C Tutorial

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C Tutorial » stdlib.h » realloc

23.25.1.realloc

Item	Value
Header file	stdlib.h
Declaration	void realloc(void ptr, size_t size);
Function	reallocate memory
Parameter	If ptr is null, realloc() simply allocates size bytes of memory and returns a pointer. If size is zero, the memory pointed to by ptr is freed.

#include <stdlib.h>

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

    char *p;



    p = malloc(17);

    if(!p) {

      printf("Allocation Error\n");

      exit(1);

    }



    strcpy(p, "This is 16 chars");



    p = realloc(p, 18);

    if(!p) {

      printf("Allocation Error\n");

      exit(1);

    }



    strcat(p, ".");



    printf(p);



    free(p);



    return 0;

  }

This is 16 chars.

23.25.realloc
	23.25.1.	realloc

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