realloc: reallocate memory : realloc « stdlib.h « C / ANSI-C

1. C / ANSI-C
2. stdlib.h
3. realloc

realloc: reallocate memory

    

//Declaration: void *realloc(void *ptr, size_t size); 
//Parameter:   If ptr is null, realloc() 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.*/ 

           
       

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