update in class

class/class_test.cpp

@@ -0,0 +1,97 @@
+#include<iostream>
+#include<windows.h>
+#include <cstdlib>
+#include <ctime>
+
+using namespace std;
+
+/*
+int main(){
+    int a,b,c;
+
+    cin >>a>>b>>c;
+
+    /*if (a = 1)
+    {
+        cout <<"no";
+        Sleep(1000);
+        return 0;
+    }
+    
+
+    if ((a+b) > c)
+    {
+        cout <<"yes";
+        Sleep(1000);
+        return 0;
+    }else if ((a+c) > b)
+    {
+        cout <<"yes";
+        Sleep(1000);
+        return 0;
+    }else if ((b+c) > a)
+    {
+        cout <<"yes";
+        Sleep(1000);
+        return 0;
+    }else
+    {
+        cout <<"no";
+        Sleep(1000);
+        return 1;
+    }
+    
+    return 0;
+}
+*/
+
+/*
+int main(){  //三角形判断
+    int a,b,c;
+
+    cin >>a>>b>>c;
+
+    if ((a+b > c) && (a+c > b) && (b+c > a))
+    {
+        cout <<"yes";
+    }else
+    {
+        cout <<"no";
+    }
+    
+    return 0;   
+}
+
+int main() {
+    srand(static_cast<unsigned int>(time(nullptr))); // 初始化随机数种子
+    int random_number = rand() % 5 + 1; // 生成 1 到 5 之间的随机数
+    cout <<random_number<<endl;
+    int player_cin;
+
+    cout <<"输入你猜的数字,1-5之间"<<endl;
+    cin >> player_cin;
+
+    if (player_cin == random_number)
+    {
+        cout <<"恭喜您,中奖了!奖金10元!"<<endl;
+        return 0;
+    }else
+    {
+        cout <<"没中奖!请付费2元"<<endl;
+        cout <<"中奖号码是:"<<random_number<<endl;
+        return 1;
+    }
+    
+    return 0;
+}*/
+
+int main(){
+    int n = 6;
+
+    //cin >> n;
+
+    int sum = n * (n+1) /2;
+
+    cout <<sum;
+    return 0;
+}

homework_laster.cpp

@@ -1,4 +1,4 @@
-#include<iostream>
+#include<iostream>  //字母位移
 
 using namespace std;