C语言之操作符

// sizeof
int main()
{
	//short  s= 0;
	//int a = 10;
	//
	//printf("%d\n", sizeof(s = a + 5));//2
	//printf("%d\n", s);//0这个是值 s=0
	/*int a = 0;
	char b = 'w';
	int arr[10] = { 0 };
	printf("%d\n", sizeof(a));
	printf("%d\n", sizeof(int));

	
	printf("%d\n", sizeof(b));
	printf("%d\n", sizeof(char));

	printf("%d\n", sizeof(arr));
	printf("%d\n", sizeof(int [10]));*/

	return 0;
}

//~--按位（二进制位）取反
int main()
{
	int a = 11;
	a = a | (1 << 2);
	printf("%d\n", a);//15
	a = a & (~(1 << 2));
	printf("%d\n", a);//11

	//0000000000000000000000001011
	//0000000000000000000000000100
	//1<<2




	//0000000000000000000000000000
	// ///1111111111111111111111111111-补码
	// ///1111111111111111111111111110-反码
	// ///1000000000000000000000000001-原码
	// -1
	int a = 0;
	printf("%d\n", ~a);
	return 0;
}

//++
int main()
{
	int a = 10;
	//printf("%d\n", ++a);//前置++，先++，后使用
	printf("%d\n", a++);//后置++,先使用，再++
	return 0;

}

//强制类型转换
int main()
{
	int a = (int)3.14;
	return 0;
}

//逻辑操作符
int main()
{
	int i = 0, a = 0, b = 2, c = 3, d = 4;//a=1时答案是 2 3 3 5 i=1（为真）
	i = a++ && ++b && d++;
	printf("a=%d\n b=%d\n c=%d\n d=%d\n",a,b,c,d);
	return 0;
}
//函数调用操作符
int get_max(int x, int y)
{
	return x > y ? x : y;
}


int main()
{
	int a = 10;
	int b = 20;
	int max=get_max(a, b);
	printf("%d\n", max);
	return 0;
}

//学生
//int float
//创建了一个结构体类型-struct stu
struct stu
{
	char name[20];
	int age;
	char id[20];
};
int main()
{
	int a = 10;
	使用struct stu这个类型创建了一个学生对象s1，并初始化
	struct stu s1 = { "张三",20,"2023410105" };
	struct stu* ps = &s1;
	
	printf("%s\n", ps->name);
	printf("%d\n", ps->age);
	/*printf("%s\n", (*ps).name);
	printf("%d\n", (*ps).age);*/
	printf("%s\n", s1.name);
	printf("%d\n", s1.age);
	printf("%s\n", s1.id);
	//结构体变量.成员名
	return 0;
}