calloc的使用

1. 作用
   给数组分配空间，并初始化为0, 与memset类似

void *calloc( 
   size_t num,
   size_t size 
);

3. 应用

// crt_calloc.c
// This program uses calloc to allocate space for
// 40 long integers. It initializes each element to zero.
 
#include <stdio.h>
#include <malloc.h>

int main( void )
{
   long *buffer;

   buffer = (long *)calloc( 40, sizeof( long ) );
   if( buffer != NULL )
      printf( "Allocated 40 long integers\n" );
   else
      printf( "Can't allocate memory\n" );
   free( buffer );
}