1.动态获得内存的代码:
void GetMemory(char **p, int num)
{
*p = (char *)malloc(sizeof(char) * num);
}
char* GetMemory2(int num)
{
char* p = (char *)malloc(sizeof(char) * num);
return p;
}
------------------------------------------
错误的代码:
void GetMemory3(char *p, int num)
{
p = (char *)malloc(sizeof(char) * num);
}///////////////错误在哪里,我就不说,自己去查.
2.strcpy()的代码:
char* strcpy(char* strDest,const char* strSrc)
{
if(strDest==NULL || strSrc==NULL) return NULL;
char* pStr=strDest;
while((*strDest++=*strSrc++)!='\0)
NULL;
return pStr;
}
3.memcpy()的代码:
void* memcpy(char* strDest,const char* strSrc,size_t size)
{
if(strDest==NULL||strSrc==NULL) return NULL;
if(size <=0) return NULL;
char* pStr=strDest;
while(size-->0)
*strDest++=*strSrc++;
return pStr;
}
4.关于sizeof操作符:
char 1
short 2
short int 2
signed short 2
unsigned short 2
int 4
long
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include ".\sqlite3_lib\sqlite3.h"
static int _callback_exec(void * notused,int argc, char ** argv, char ** aszColName)
{
int i;
for ( i=0; i<argc; i++ )
......
