diff --git "a/18 \350\260\242\345\256\270/20221220 \345\207\275\346\225\260.md" "b/18 \350\260\242\345\256\270/20221220 \345\207\275\346\225\260.md"
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@@ -0,0 +1,103 @@
+
+
+```
+mport java.util.Scanner;
+
+public class cls {
+    //    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
+    public static void main(String[] args) {
+        Scanner bj = new Scanner(System.in);
+        System.out.println("请输入圆的半径:");
+        double num = bj.nextInt();
+        double s = a(num);
+        System.out.println("圆的面积为:" + s);
+        double l = b(num);
+        System.out.println("圆的周长为:" + l);
+    }
+    static double a(double num) {
+        return 3.14*(num * num) ;
+    }
+    static double b(double num) {
+        return 2 * 3.14 * num;
+    }
+}
+```
+
+```
+import java.util.Scanner;
+
+public class cls {
+
+    public static void main(String[] args) {
+        Scanner shu =new Scanner(System.in);
+        System.out.println("请输入一个1到10的数:");
+        int ss = shu.nextInt();
+        int[] nums = new int[20];
+        for (int i = 0; i < nums.length; i++) {
+            nums[i] = (int) (Math.random() * 10);
+            System.out.print(nums[i]+"\t");}
+        System.out.println("");
+        int count =num(nums,ss);
+        System.out.println("该数在下面的随机数中共出现过"+count+"次");
+    }
+    static int num (int []nums,int ss){0
+        int count =0;
+        for (int i =0;i< nums.length;i++)
+            if (nums [i] ==ss)
+                count++;
+        return count;
+    }
+}
+```
+
+```
+import java.util.Arrays;
+import java.util.Scanner;
+
+public class cls {
+
+    public static void main(String[] args) {
+        int[] b = new int[5];
+        Scanner sc = new Scanner(System.in);
+        for (int i = 0; i < b.length; i++) {
+            System.out.println("请输入第" + (i + 1) + "个");
+            b[i] = sc.nextInt();
+        }
+        System.out.println(Arrays.toString(b));
+        Aaf(b);
+    }
+
+    public static void Aaf(int[] abc) {
+        int sum = 0;
+        for (int i = 0; i < abc.length; i++) {
+            sum += abc[i];
+        }
+        System.out.println(sum);
+    }
+}
+```
+
+```
+import java.util.Scanner;
+        public class cls {
+            public static void main(String[] args) {
+   Scanner sc = new Scanner(System.in);
+  System.out.println("请输入数：");
+    int a = sc.nextInt();
+    int sum = 0;
+    for (int i = 1; i <= a; i++) {
+       for (int j = 1; j <= i; j++) {
+           sum+=b(j);
+        }
+   }
+    System.out.println(sum);
+}
+    public static int b(int a){
+        int sum = 1;
+        for (int i = 1; i <= a; i++) {
+            sum *= i;
+        }
+        return sum;
+    }
+            }
+```