10-9学习笔记

1.#define定义常量和宏

#define MAX(X,Y) (X>Y?X:Y)  
int Max(int x, int y)

{

	if (x > y)

  return x;

	else

  return y;

}

int main() {

	int a = 10;

	int b = 20;

	int max1 = Max(a, b);//函数

	int max2 = MAX(a, b);//宏

	printf("%d\n", max1);

	printf("%d\n", max2);

	return 0;

}

2.指针

int main() {
	int a = 10;
	int* p = &a;
	*p = 20;//解引用操作符
	printf("%p\n", p);
	printf(" % d\n", *p);
	return 0;
}