修复两位小数问题

.vscode/launch.json

@@ -1,33 +0,0 @@
-{
-    // 使用 IntelliSense 了解相关属性。 
-    // 悬停以查看现有属性的描述。
-    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "name": "(gdb) 启动",
-            "type": "cppdbg",
-            "request": "launch",
-            "program": "输入程序名称，例如 ${workspaceFolder}/a.out",
-            "args": [],
-            "stopAtEntry": false,
-            "cwd": "${fileDirname}",
-            "environment": [],
-            "externalConsole": false,
-            "MIMode": "gdb",
-            "setupCommands": [
-                {
-                    "description": "为 gdb 启用整齐打印",
-                    "text": "-enable-pretty-printing",
-                    "ignoreFailures": true
-                },
-                {
-                    "description": "将反汇编风格设置为 Intel",
-                    "text": "-gdb-set disassembly-flavor intel",
-                    "ignoreFailures": true
-                }
-            ]
-        }
-
-    ]
-}

.vscode/tasks.json

@@ -1,28 +0,0 @@
-{
-    "tasks": [
-        {
-            "type": "cppbuild",
-            "label": "C/C++: gcc 生成活动文件",
-            "command": "/usr/bin/gcc",
-            "args": [
-                "-fdiagnostics-color=always",
-                "-g",
-                "${file}",
-                "-o",
-                "${fileDirname}/${fileBasenameNoExtension}"
-            ],
-            "options": {
-                "cwd": "${fileDirname}"
-            },
-            "problemMatcher": [
-                "$gcc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            },
-            "detail": "调试器生成的任务。"
-        }
-    ],
-    "version": "2.0.0"
-}

test1.cpp

@@ -28,6 +28,6 @@ int main()
     cout << i + 1 << endl;
     for (int j = 0; j <= i; j++)
     {
-        cout << books[j].no << "\t" << books[j].name << "\t" << setprecision(2) << books[j].price << endl;
+        cout << books[j].no << "\t" << books[j].name << "\t" << fixed << setprecision(2) << books[j].price << endl;
     }
 }