#include<stdio.h>
#include<string.h>
intmain()
{
charbuffer[1024]={0,1,2,3,4,5,6,7};
intiTest=0x12345678;//16進位制1位表示4個bit，itest表示4個byte
int*p=(int*)(buffer+7);//指標+數字表示表示擷取陣列，buffer第7位開始以後的陣列
printf("intlen:%ditestlen:%ditest:%d\n",sizeof(int),sizeof(iTest),iTest);
memcpy(p,&iTest,sizeof(iTest));
 
//iTest
printf("%x\n",buffer[6]);
printf("%x\n",buffer[9]);
return0;
}

上面程式寫的有問題：應該是

char *p = buffer + 7;

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

int main()
{
  char buffer[1024] = {0,1,2,3,4,5,6,7};
  int iTest = 0x12345678;
  char *p = buffer + 7;
  memcpy(p, &iTest, sizeof
 
(iTest));
  printf("%xn", buffer[6]);  
  printf("%xn", buffer[9]);   
  return 0;
}