课堂笔记2
一：扩展赋值运算符
二：条件预算符：（三目运算符）
三：字符串链接运算：
int a=109;
System.out.println(100+5+"a的值:");
System.out.println("a的值:"+100+5);
}
}
105a的值:
a的值:1005
四：运算符优先级：
不记优先级表直接加“（）”。
五：Java分隔符
JA V A 程序结构
三种结构：
顺序结构：
选择结构：（分支）
if-else(import (引入导入）java.until.Scanner;)导入一个Scanner 类
if (number < 40) {
System.out.println("cha");
System.out.println("考试不通过");
}else if(number >=90){
System.out.println("优秀");
System.out.println("llijl");
} else if(number >=60 && number <=90){
System.out.println("及格");
} else {
System.out.println("不及格");
System.out.println("cc");
}
}
}
swich
循环结构
*Ada语言
PM
Switch 语句
/*
* int arco=50; double b=(arco>60)?9.99:8; System.out.println(b);
*/
/*
* int a=109; System.out.println(100+5+"a的值:");
* System.out.println("a的值:"+100+5);
*/
/*
* Scanner sc = new Scanner(System.in);
*
* System.out.println("请输入年份"); int year = sc.nextInt();
*
* if (number >= 60 && number <=70) { System.out.println("及格");
* System.out.println("考试通过");} if (number >= 80 && number <90) {
* System.out.println("优秀"); System.out.println("奖励");} if (number < 40)
* { System.out.println("cha");
*
* System.out.println("考试不通过"); if(number == 100){
* System.out.println("good"); }else{ System.out.println("aa"); } }else
* if(number >=90){ System.out.println("优秀");
*
*
*
* } else if(number >=60 && number <=90){ System.out.println("及格"); }
* else { System.out.println("不及格"); System.out.println("cc");
*
*
*
* } }
*
* if ((year %4==0 && year %100!=0)||(year%400==0)) {
* System.out.println("润年"); }else System.out.println("平年"); }
*/
/*Scanner sc = new Scanner(System.in);
System.out.println("请输入一个数");
int number = sc.nextInt();
int a = number % 1000;
int b = (number - a * 1000) % 100;
int c = ((number - a * 1000) - b * 100) % 10;
int d = ((number - a * 1000) - b * 100) - c * 10;
int suma = 0;// 偶数个数
int sumb = 0;// 奇数个数
if (a % 2 == 0)
suma++;
else
sumb++;
if (b % 2 == 0)
suma++;
else
sumb++;
if (c % 2 == 0)
suma++;
else
sumb++;
if (d % 2 == 0)
suma++;
else
sumb++;
System.out.println("偶数个数" + suma);
System.out.println("奇数个数" + sumb)*/;
/*Scanner sc = new Scanner(System.in);
System.out.println("请输入一个学分等级");
char grade= sc.next().charAt(0);
switch (grade) {
case 'A':
System.out.println("85~100");
break;
case 'B':
System.out.println("70~84");
break;
case 'C':
System.out.println("60~69");
break;
case 'D':
System.out.println("<60");
break;*/
/*int sum=0;
for(int i=1;i<=100;i++) {
sum=sum+i;
}
System.out.println(sum);
}*/
/*int sum=0;
int i=1;
while(i<=100){
sum+=i;
i++;
}*/
int sum=0;
int i=1;
do {
sum+=i;
i++;
}while(i<=100);
System.out.println(sum);
}
}
/*
* int a=109; System.out.println(100+5+"a的值:");
* System.out.println("a的值:"+100+5);
*/
/*
* Scanner sc = new Scanner(System.in);
*
* System.out.println("请输入年份"); int year = sc.nextInt();
*
* if (number >= 60 && number <=70) { System.out.println("及格");
* System.out.println("考试通过");} if (number >= 80 && number <90) {
* System.out.println("优秀"); System.out.println("奖励");} if (number < 40)
* { System.out.println("cha");
*
* System.out.println("考试不通过"); if(number == 100){
* System.out.println("good"); }else{ System.out.println("aa"); } }else
* if(number >=90){ System.out.println("优秀");
*
*
*
* } else if(number >=60 && number <=90){ System.out.println("及格"); }
* else { System.out.println("不及格"); System.out.println("cc");
*
*
*
* } }
*
* if ((year %4==0 && year %100!=0)||(year%400==0)) {
* System.out.println("润年"); }else System.out.println("平年"); }
*/
/*
* Scanner sc = new Scanner(System.in); System.out.println("请输入一个数");
*
* int number = sc.nextInt();
*
* int a = number % 1000; int b = (number - a * 1000) /100; int c =
* (number - a * 1000 - b * 100) /10; int d = c / 10;
*
* int suma = 0;// 偶数个数int sumb = 0;// 奇数个数
*
* if (a % 2 == 0) suma++; else sumb++;
*
* if (b % 2 == 0) suma++; else sumb++; if (c % 2 == 0) suma++; else
* sumb++; if (d % 2 == 0) suma++; else sumb++;
*
* System.out.println("偶数个数" + suma); System.out.println("奇数个数" + sumb); */
/*
* Scanner sc = new Scanner(System.in); System.out.println("请输入一个学分等级"); * char grade= sc.next().charAt(0); switch (grade) { case 'A':
* System.out.println("85~100"); break; case 'B':
* System.out.println("70~84"); break; case 'C':
* System.out.println("60~69"); break; case 'D':
* System.out.println("<60"); break;
*/
/*
* int sum=0; int i=1; for(;;) { sum=sum+i; i++;
*/
/*
* int sum=0; int i=1;
*/
/*
* do { sum+=i; i++; }while(i<=100);
*/
* int sum=0; int i=1;
*
* while(true){ sum+=i; i++;
*
* }
*/
/*
* for(int i=0;i<10;i++) { if(i==5) continue;
* System.out.println("i="+i); }
*/
/*
* double a=2.5; float b=(float)7.5;
*
* double sum=(double)(a*a+b*b); System.out.println(sum);
*/
/* (Math.pow(a.2)+Math.pow(b.2) */
/*
* int b=0 for(int i=0;i<=200;i++){ if( i%7==0 && i%4 !=0){ b++;
* System.out.println(i+" "); if(b%6==0) System.out.println(); } }
*/
/*
* double A=1.9; double b=2.3; double c=3.4; double x=5.5; double s=
* A*Math.pow(x.2)+..
*/
/*
* String l="-Ax*x+bx+c"; System.out.println(l); String
* s="-(x+y)*(x+y)*(x+y)"; System.out.println(s); String
* m="-(a+b)/(a-b)"; System.out.println(m);
*/
/*
* Scanner sc = new Scanner(System.in); System.out.println("消费金额"); int * a = sc.nextInt();
*
* if(a>=200&&a<300){ System.out.println("获20元优惠券"); } else if
* (a>=300&&a<500){ System.out.println("获50元"); } else if (a>500){
* System.out.println("获100元"); }
*/
/*
* for(int i=100;i<=999;i++){ int hu=i/100; int d=i/10%10; int s=i%10;
* System.out.println(hu+" "+d+" "+s+" ");
*
* int sum=(int)(Math.pow(hu,3))+(int)(Math.pow(d,
* 3))+(int)(Math.pow(s,3)); if(sum==i){ System.out.println(i+" "); }
*/
* int sum=0; int p=1; for(int i=13;i<=1003;i=i+10){ int n=i*p;
* System.out.println(n); sum+=n; p=-p; } System.out.println(sum);
*/
for (int i = 1; i <= 1000; i++) {
if (i % 3 == 0 && i % 5 == 0 && i % 7 == 0) {
System.out.println(i);
}
}
}
}