homework 12.14

homework.cpp

@@ -0,0 +1,72 @@
+#include<iostream>
+#include<windows.h>
+
+using namespace std;
+void while_on();
+void while_off();
+
+int main(){
+    cout <<"请选择"<<endl;
+    cout <<"1.不带循环版"<<endl<<"2.带循环版"<<endl<<"3.退出"<<endl;
+    cout <<">>>";
+    int count;
+    cin >>count;
+
+    if (count == 1)
+    {
+        while_off();
+    }else if (count == 2)
+    {
+        while_on();
+    }else if (count == 3)
+    {
+        return 0;
+    }else
+    {
+        cout <<"无效的选择!"<<endl;
+        Sleep(1850);
+        return 1;
+    }
+    return 0;    
+}
+
+void while_off(){
+    cout <<"现在模式是 不带循环版"<<endl;
+    Sleep(1250);
+
+    cout <<"请输入一个正整数:";
+    int num;
+    cin >>num;
+
+    int count1 = 0;
+    while (num > 0)
+    {
+        num /= 10;
+        count1++;
+    }
+    cout <<count1<<endl;
+    Sleep(2000);
+   
+}
+
+void while_on(){
+    cout <<"现在模式是 带循环版"<<endl;
+    Sleep(1250);
+
+    while (TRUE)
+    {
+        cout <<"请输入一个正整数:";
+        int num;
+        cin >>num;
+
+        int count2 = 0;
+
+        while (num > 0)
+        {
+            num /= 10;
+            count2++;
+        }
+        cout <<count2<<endl;
+        Sleep(2000);        
+    }
+}