重新分配主存

[c]代码库

#include <stdio.h> 
#include <alloc.h> 
#include <string.h> 

int main(void) 
{ 
   char *str; 

   /* allocate memory for string */ 
   str = malloc(10); 

   /* copy "Hello" into string */ 
   strcpy(str, "Hello"); 

   printf("String is %s\n  Address is %p\n", str, str); 
   str = realloc(str, 20); 
   printf("String is %s\n  New address is %p\n", str, str); 

   /* free memory */ 
   free(str); 

   return 0; 
}