第三次实验课代码

添加NumberCounter和EncryptDemo

C02 Expresion/src/NumberProcessor.java

@@ -5,10 +5,10 @@ public class NumberProcessor {
         Scanner sc = new Scanner(System.in);
         System.out.println("请输入一个三位或四位整数");
         int number = sc.nextInt();
-        if(number%100>0 && number%100<10){
+        if(number%100>0 && number%100<99){
             while(number>0){
                 System.out.println(number%10);
-                number=number/10;
+                number = number / 10;
             }
         } else if(number<0)
             System.out.println("请重新输入一个正整数");

C03 ControlFlow/C03 ControlFlow.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

C03 ControlFlow/src/EncryptDemo.java

@@ -0,0 +1,26 @@
+import java.util.Scanner;
+import java.util.Arrays;
+
+public class EncryptDemo {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        String str = sc.nextLine();
+
+        byte key = sc.nextByte();
+        char[] enc= new char[str.length()];
+        for(int i=0;i<str.length();i++)
+            enc[i] =(char)(str.charAt(i) ^ key);
+
+//        for(char c:enc)
+//            System.out.print(c);
+        System.out.println(Arrays.toString(enc));
+
+        char[] dec= new char[enc.length];
+        for(int i=0;i<str.length();i++)
+            dec[i] =(char)(enc[i] ^ key);
+
+//        for(char c:dec)
+//            System.out.print(c);
+        System.out.println(Arrays.toString(dec));
+    }
+}

C03 ControlFlow/src/NumberCounter.java

@@ -0,0 +1,17 @@
+import java.util.Scanner;
+
+public class NumberCounter {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        long num = sc.nextLong();
+        int[] hash = new int[10];
+        while(num>0){
+            hash[(int)(num%10)]++;
+            num/=10;
+        }
+
+        for(int i : hash)
+            System.out.print(i+" ");
+        System.out.println();
+    }
+}