From 5836b58aac89bff6f154076040e0e4ed29a206a4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=8F=AD=E9=98=B3=E4=B8=BD?= <2431466589@qq.com> Date: Sun, 4 Dec 2022 21:15:11 +0800 Subject: [PATCH 1/2] =?UTF-8?q?=E7=AC=AC=E4=BA=94=E6=AC=A1=E4=BD=9C?= =?UTF-8?q?=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...20221201 java-if \350\257\255\345\217\245" | 0 ...2\347\216\257\350\257\255\345\217\245.txt" | 119 ++++++++++++++++++ 2 files changed, 119 insertions(+) delete mode 100644 "37 \346\217\255\351\230\263\344\270\275/20221201 java-if \350\257\255\345\217\245" create mode 100644 "37 \346\217\255\351\230\263\344\270\275/20221204 for\345\276\252\347\216\257\350\257\255\345\217\245.txt" diff --git "a/37 \346\217\255\351\230\263\344\270\275/20221201 java-if \350\257\255\345\217\245" "b/37 \346\217\255\351\230\263\344\270\275/20221201 java-if \350\257\255\345\217\245" deleted file mode 100644 index e69de29..0000000 diff --git "a/37 \346\217\255\351\230\263\344\270\275/20221204 for\345\276\252\347\216\257\350\257\255\345\217\245.txt" "b/37 \346\217\255\351\230\263\344\270\275/20221204 for\345\276\252\347\216\257\350\257\255\345\217\245.txt" new file mode 100644 index 0000000..f9ac3f6 --- /dev/null +++ "b/37 \346\217\255\351\230\263\344\270\275/20221204 for\345\276\252\347\216\257\350\257\255\345\217\245.txt" @@ -0,0 +1,119 @@ +### 笔记 + +#### if和Switch的区别 + +```java +Switch能做的if也能做，但if能做的Switch不一定能做 +if可以判断Switch的一个范围 +而Switch只能判断特定的一个值 +``` + +#### Switch + +```java +switch支持字符串，但不支持布尔值变量 +``` + +#### for循环 + +```java +for(初始化语句；条件语句；控制语句){ + 循环体；若干语句 +} +``` + +#### for循环乘法表 + +```java +package Work; + +public class D5 { + public static void main(String[] args) { + for (int i=1; i<=9;i++){ + for (int x=1; x<=i;x++){ + System.out.print(x+"*"+i+"="+(i*x)+" "); + } + System.out.println(""); + } + + } +} +``` + +#### for循环26字母，每两字母换行 + +```java +package Work; + +public class D4 { + public static void main(String[] args) { + char a=97; + int b=0; + for (a=97;a<=122;a++){ + if (b%2==0){ + System.out.println(); + } + System.out.print(a); + b++; + } + + + + } +} +``` + +#### for循环作业(1) + +##### 题目： + +让用户输入一个数字，根据这个数字，循环输出“我爱学习，我爱java”，比如，用户输入数字9就在控制台输出9行“我爱学习，我爱java” + +```java +package Work; + +import java.util.Scanner; + +public class D6 { + public static void main(String[] args) { + Scanner sc= new Scanner(System.in); + System.out.println("请输入数字"); + int a=sc.nextInt(); + for (int i=1;i<=a;i++){ + System.out.println( "我爱学习，我爱java"); + } + } +} +``` + +#### for循环作业（2） + +##### 题目： + +用户分别输入数a，数b，让程序实现从a开始循环到b，输出“有生之年，能看到中国队出线吗？” + +```java +package Work; + +import java.util.Scanner; + +public class D9 { + public static void main(String[] args) { + Scanner cs= new Scanner(System.in); + System.out.println("请输入a"); + int a= cs.nextInt(); + System.out.println("请输入b"); + int b=cs.nextInt(); + for (int i=a;i Date: Tue, 6 Dec 2022 23:36:07 +0800 Subject: [PATCH 2/2] =?UTF-8?q?=E7=AC=AC=E5=85=AD=E6=AC=A1=E4=BD=9C?= =?UTF-8?q?=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...2\347\216\257\344\275\234\344\270\232.txt" | 65 +++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 "37 \346\217\255\351\230\263\344\270\275/20221206 while\345\276\252\347\216\257\344\275\234\344\270\232.txt" diff --git "a/37 \346\217\255\351\230\263\344\270\275/20221206 while\345\276\252\347\216\257\344\275\234\344\270\232.txt" "b/37 \346\217\255\351\230\263\344\270\275/20221206 while\345\276\252\347\216\257\344\275\234\344\270\232.txt" new file mode 100644 index 0000000..4444bde --- /dev/null +++ "b/37 \346\217\255\351\230\263\344\270\275/20221206 while\345\276\252\347\216\257\344\275\234\344\270\232.txt" @@ -0,0 +1,65 @@ +作业(1) + +```java +package Work; + + +import java.util.Random; +import java.util.Scanner; + + public class A1 { + public static void main(String[] args) { + Random r =new Random(); + Scanner sc= new Scanner(System.in); + // System.out.println("请猜一猜这个数字是什么"); + int num=r.nextInt(100); + int count =0; + while (true){ + count++; + System.out.println("请猜一猜这个数字是什么"); + int um = sc.nextInt(); + if (um>num){ + System.out.println("你猜的数字太大了！再猜"); + }else if (um1 && count<=6 && um==num){ + System.out.println("你很聪明"); + break; + }else { + System.out.println("猜对了！"); + System.out.println("你一共猜了"+count+"次"); + System.out.println("笨笨，你猜这么多次"); + break; + + } + } + } + } + +``` + +作业（2） + +```jav +package Work; + +public class A2 { + + public static void main(String[] args) { + int j=555555; + int i; + int k = 0; + for (i = 999; i >= 100; i--) { + k=j%i; + if(k==0){ + System.out.println(i); + break; + } + } + } + } +``` + -- Gitee