save code

old/lession5.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+#include <cstdlib>
+#include <ctime>
+
+int main() {
+
+    std::srand(std::time(nullptr));
+    int r =std::rand() % 101;
+    std::cout << " 随机数 " << r << "\n";
+    if ( r < 70)
+    {
+        std::cout << " 普通卡 " << "\n";
+    }
+    else if (r < 95)
+    {
+        std::cout << " 稀有卡" << "\n";
+    }
+    else
+    {
+        std::cout << " 传说卡 " << "\n";
+    }
+    return 0;
+}