C 画画内存图

//-------------------------1------
int a = 1;
void f(int b)
{
	int c = 2;
	c++;
	static int d = 1;
	d++;
	a += b + c + d;
} int e = 3;
void main()
{	int p[] = {a,e,a+e};
	char* q = "abcdef";
	char w[10] = "123xyz";
	strcpy(w+2,q+1);
	p[0] = a;
	f(4);
	p[1] = a*2; 
	strcpy(w,"hello");
	f(5);
	p[2] = a * 3;
}
//--------------2-------------------
void main()
{
  char* p = (char*)malloc(10);
  *(p+1) = "abcdef"[2];
  strcpy(p,"xyz");
  int x = 1;
  int y = 2;
  strcpy(p+3,"QWERTY"+x+y);
  char* q = p;
  char z[] = {p[0],p[1],p[4]};
  free(q);
  p = z;
  q = p + 4;
  *q = 'W';
}
//--------------3-------------------
void main(){
char* arr[3]={"123","abcdef","hh"};
char* p = arr[0];
cout<< p << *p;
char* q = p + 1;
cout<< q << *q;
q = arr[1];
cout<< q << *q;
}


//--------------4-------------------
int* p;
void main()
{
  p = (int*)malloc(16);
  for (int i = 0;i < 4; ++i)
     p[i] = i*10+1;
  int x[] = {p[0],p[2],p[1]+p[3]};
  int* q = p;
  q += 1;
  *q = 5;
  q += 1;
  *q = 10;
  free(q-2);
  p = x+1;
  q = p+1;
  *x = *p * *q;  
}
//------------------5---------------
void main(){
short arr[3][2]={1,2,3,4,5,6};
arr[0][0] = arr[0][1];
short* p = arr[0];
short* q = arr[1];
int d = p[0] + q[2];
}
//----------------6------------------
void f(int* p)
{
  p = (int*)malloc(8);
  *p = 100;
  *(p+1) = 200;
}
void main(){
   int* q = 0;
   f(q);   
}
//----------------7-----------------
void f(int*& p)
{
  p = (int*)malloc(8);
  *p = 100;
  *(p+1) = 200;
}
void main(){
   int* q = 0;
   f(q);   
}
//----------------8-----------------
void f(int** p)
{
  *p = (int*)malloc(8);
  **p = 100;
  *(*p+1) = 200;
}
void main(){
   int* q = 0;
   f(&q);   
}

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