From 385a84bccae4b0e8bcd78c61c7ac57197129730f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BE=90=E9=9B=A8=E6=99=B4?= <2137161545@qq.com>
Date: Mon, 19 Dec 2022 23:40:55 +0800
Subject: [PATCH] =?UTF-8?q?=E6=96=B9=E6=B3=95=E4=BD=9C=E4=B8=9A?=
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---
 .../20221211    \344\275\234\344\270\232.md"  | 150 ++++++++++++++++++
 1 file changed, 150 insertions(+)

diff --git "a/03  \345\276\220\351\233\250\346\231\264/20221211    \344\275\234\344\270\232.md" "b/03  \345\276\220\351\233\250\346\231\264/20221211    \344\275\234\344\270\232.md"
index 99c6613..4c77c59 100644
--- "a/03  \345\276\220\351\233\250\346\231\264/20221211    \344\275\234\344\270\232.md"	
+++ "b/03  \345\276\220\351\233\250\346\231\264/20221211    \344\275\234\344\270\232.md"	
@@ -82,3 +82,153 @@ public class class4 {
 }
 ```
 
+5. **编写函数，计算圆的面积和周长，在主函数中接受圆的半径，在自定义函数中计算并输出**
+
+```java
+import java.util.Scanner;
+
+public class class10 {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("请输入圆的半径（cm）：");
+        double r=sc.nextDouble();
+        System.out.println("当半径为"+r+"cm时，它的周长为"+getc(r)+"cm,面积为"+gets(r)+"cm²");
+    }
+    static double getc(double r){
+        return 2*3.14*r;
+    }
+    static  double gets(double r){
+        return 3.14*r*r;
+    }
+}
+```
+
+6. **在主函数中产生20个0-10之间的随机数，将这20个随机数存入数组，并通过函数计算某个数在这些随机数中出现的次数（这“某个数”是在主函数中由用户输入的）**
+
+```java
+import java.util.Random;
+import java.util.Scanner;
+
+public class class11 {
+    public static void main(String[] args) {
+        int[] num=new int[20];
+        Random ran=new Random();
+        int sum=0;
+        for (int n=0;n<num.length;n++){
+            num[n]=ran.nextInt(11);
+            System.out.print(num[n]+"\t");
+        }
+        Scanner sc=new Scanner(System.in);
+        System.out.println();
+        System.out.println("请输入数值：");
+        int m=sc.nextInt();
+
+    }
+    static void quantity(int[] num,int m) {
+        int count = 0;
+        for (int n = 0; n < num.length; n++) {
+            if (m==num[n]) {
+                count++;
+            }
+        }
+        System.out.println(m + "在数组中出现了" + count+"次");
+    }
+
+}
+
+```
+
+7. **在主函数中接收10个数存入数组，在自定义函数中，将该数组中的最大值与第一个元素交换，最小值与最后一个元素交换，然后在主函数中输出交换后的数组**
+
+```java
+import java.util.Arrays;
+import java.util.Scanner;
+
+public class class12 {
+    public static void main(String[] args) {
+        int[] num=new int[10];
+        Scanner sc=new Scanner(System.in);
+
+        for (int n=0;n< num.length;n++){
+            System.out.println("请输入第"+(n+1)+"个数");
+            num[n]=sc.nextInt();
+        }
+        System.out.println(Arrays.toString(num));
+        exchange(num);
+        }
+    static void exchange(int[] num) {
+        int max = num[0];
+        for (int m : num) {
+            if (m > max) {
+                int n= num[0];
+                num[0]=max;
+                max = n;
+            }
+        }
+        int min=num[0];
+        for (int m:num){
+            if (m<min) {
+                int n= num[9];
+                num[9]=min;
+                min=n;
+            }
+        }
+        System.out.println(Arrays.toString(num));
+    }
+}
+
+```
+
+
+
+8. **用自定义函数是实现求某数组元素的和（大小不固定）**
+
+```java
+import java.util.Random;
+
+public class class13 {
+    public static void main(String[] args) {
+        int[] num=new int[10];
+        Random ran=new Random();
+        for (int n=0;n<num.length;n++){
+            num[n]=ran.nextInt(11);
+            System.out.print(num[n]+"\t");
+        }
+        System.out.println();
+        System.out.print("这组数组的和为："+getsum(num));
+    }
+    static int getsum(int[] num){
+        int sum=num[0];
+        for (int n=1;n< num.length;n++){
+            sum+=num[n];
+        }
+        return sum;
+    }
+}
+```
+
+9. **用户输入整数n，计算1+(1+2)+(1+2+3)+…..+(1+2+…n)**
+
+```java
+import java.util.Scanner;
+
+public class class14 {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("请输入n的值为：");
+        int n= sc.nextInt();
+
+        System.out.println("当n为"+n+"时，结果为："+getsum(n));
+
+    }
+    static int getsum(int n){
+        int sum=0;
+        for (int m=0;m<n;m++){
+            sum+=n;
+        }
+        return sum;
+    }
+}
+
+```
+
-- 
Gitee