日常练习

Sunbeam-5 · Jun 4, 2022 · 7a5231a · 7a5231a
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diff --git a/20220602/out/production/20220602/找出出现一次的数字.class b/20220602/out/production/20220602/找出出现一次的数字.class
diff --git a/20220602/out/production/20220602/数字9出现的次数.class b/20220602/out/production/20220602/数字9出现的次数.class
diff --git a/20220602/src/数字9出现的次数.java b/20220602/src/数字9出现的次数.java
@@ -0,0 +1,15 @@
+public class 数字9出现的次数 {
+    public static void main(String[] args) {
+        int i = 0;
+        for (int a = 1; a <= 100 ;a++) {
+            if ((a / 10) == 9) {
+                i++;
+            }
+            if ((a % 10) == 9) {
+                i++;
+            }
+        }
+        System.out.println(i);
+    }
+}
+