C语言之关系运算符、逻辑运算符、三目运算符

#include<stdio.h>

int main() {

/*__________________1、关系运算符______________________________*/

//5是大于4的，所以结果为真，C语言里面真用1表示
int a1 = 5 > 4;
printf("a1:%d\n",a1);

int a2 = 5 < 4;
printf("a2:%d\n",a2);

int a3 = 5 >= 4; //结果为真
printf("a3:%d\n",a3);

int b1 = 10,b2 = 10;
//比较两个值是否相等
int r1 = b1 == b2;
int r2 = b1 != b2;
printf("r1:%d r2:%d\n",r1,r2);

//注意：
//先计算 3>2 再计算 ==
int c1 = 1 == 3 > 2;
printf("%d \n",c1);

//结合方向是”从左往右“，先计算 4>3
int c2 = 4 > 3 > 2;

//先计算算术运算符，再计算关系运算符
int c3 = 3+4 > 8-2;

/*__________________2、逻辑运算符______________________________*/
//1.逻辑与 &&
int a = 4; //a = 6;
//判断a是否在（3，5）之间
// int result1 = 3<a<5; 错误的
int result1 = (a>3) && (a<5);

//2、逻辑或

//判断b是否在（3，5）之外
int b = 10;

int result2 = (b <= 3) || (b >= 5);
printf("result2:%d\n", result2);

//3、逻辑非 !
int result3 = !(a > 0);
printf("result3:%d\n",result3 );

//算术运算符、关系运算符、逻辑运算符
int a4 = !1 + 5; //结果是5，说明！优先级大于算术运算符
printf("%d\n",a4 );

// 优先级：() > ! > 算术运算符>关系运算符>&&>||>赋值运算符

/*____________________3、三目运算符_________________________________*/

int score;

//C语言里面的去地址符号：&
scanf("%d",&score);

char cj = score >= 60 ? 'Y':'N';
printf("及格了吗：%c\n", cj);

return 0;
}