向null地址copy数据和不断改变指针指向

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main11()
{

system("pause");
return 0;
}

void main22()
{
char *p1 = NULL;
p1 = 0x00077;
strcpy(p1, "11111222");
system("pause");
return ;
}

void main()
{
char buf[128];
int    i;
int j = 0;

char *p1 = NULL;//c可以在栈上分配内存
char *p2 = NULL;
p1 = &buf[0];    //不断的改变p1的值 相当于不断的改变指针的指向。
p1 = &buf[1];
p1 = &buf[2];

for ( i = 0; i < 10;i++)
{
p1 = &buf[i];
}

p2 = (char *)malloc(100);
strcpy(p2,"abdafgadf121313");
for ( i = 0; i < 10; i++)
{
p1 = p2 + i;
printf("%c ", *p1);
}
printf("hello....\n");
system("pause");
return;
}