函数指针的使用

#include<Windows.h>
int (int a, int b)
{
	return a + b;
}
void msg()
{
	MessageBoxA(0, "您将打开百度", "提示", 0);
}
void baidu()
{
	ShellExecuteA(0, "open", "www.baidu.com", 0, 0, 3);
}
void main()
{

	//int (*p)(int a,int b)=add;
	int(*p)() = add;//不带形参也可
	void(*p1)() = msg;
	void(*p2)() = baidu;
	printf("%dn",p(2,3));
	p1();
	p2();
	Sleep(2000);
	MessageBoxA(0, "桌面已被修改", "提示", 0);
	SystemParametersInfoA(20, 0, "图片路径", 3);//改变桌面图片
	//printf("%xn",msg);
}