package learnJava;
import java.util.Scanner;
public class learn2_1 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println("请投币");
int amount = in.nextInt();
/*比较
* 关系运算符
* == != > >= < <=
* 优先级
* == != 优先级 低于 其他关系运算符
* 所有的关系运算符的优先级 低于 算术运算符
* true 和 false 不能比较大小
* 浮点数比较大小: Math.abs(f1-f2)<1e-6
*/
/*判断
*if
*/
if(amount>=10)
{
System.out.println("***********");
System.out.println("* 票价:10元 *");
System.out.println("***********");
System.out.println("找零:"+(amount-10));
}
else
{
System.out.println("***********");
System.out.println("* 请重新投币 *");
System.out.println("***********");
}
/*
*分支
*if else 最好用{}
*比较3个数大小
*/
int x = in.nextInt();
int y = in.nextInt();
int z = in.nextInt();
int max = 0;
if (x>y)
{
if(x>z)
{
max = x;
}
else
{
max = z;
}
}
else
{
if (y>z)
{
max = y;
}
else
{
max = z;
}
}
System.out.println("max="+max);
/*
*switch-case 都跟c差不多
*没有break ,还会继续往下运行
* */
int type = in.nextInt();
switch(type) {
case 1:
case 2: System.out.println(2); break;
case 3:
default:System.out.println("啥也不是"); break;
}
/*
* 常见错误
* if();
* if(a=b)
* if else 最好加括号和缩进
*/
}
}
Week 2: Comparison & Judgment & Branch & Judgment Statement Common Mistakes
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Origin blog.csdn.net/buxiangquaa/article/details/114647697
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