cin>>k; Switch (k<1) { default : case 1: cout<<”G”; case 2: cout<<”L”;
时间: 2023-12-06 15:44:25 浏览: 52
这段代码存在一些问题,首先是语法问题,应该是 `switch (k)` 而不是 `Switch (k)`。其次,在 `switch` 语句中,`case` 标签应该是整数常量表达式,而不是条件表达式,因此 `case 1:` 和 `case 2:` 后面应该有 `break;` 语句来防止代码继续执行下去。最后,由于没有 `default:` 标签,当 `k` 的值小于 1 时,程序会进入未定义行为。
可能的修复版本如下:
```c++
#include <iostream>
using namespace std;
int main() {
int k;
cin >> k;
switch (k) {
case 1:
cout << "G";
break;
case 2:
cout << "L";
break;
default:
break;
}
return 0;
}
```
注意,上述代码中的 `default:` 标签是可以省略不写的,因为 `k` 的取值范围已经被 `case 1:` 和 `case 2:` 覆盖完全了。
相关问题
cin>>k; Switch (1) { default : case 1: cout<<”G”; case 2: cout<<”L”;
这段代码存在一些问题,正确的写法应该是这样的:
```c++
cin >> k;
switch (k) {
default:
case 1:
cout << "G";
break;
case 2:
cout << "L";
break;
}
```
首先,`Switch` 应该是 `switch`,大小写错误会导致编译错误。
其次,`switch` 语句应该使用花括号 `{}` 包裹代码块,代码块中的每个 `case` 后面需要加上 `break` 语句,否则会出现“穿透”现象,即不止执行当前的 `case`,还会继续执行下面的 `case`,直到遇到 `break` 或者 `switch` 语句结束。在这个例子中,如果输入的 `k` 不是 1 或者 2,就会执行 `default` 下面的代码,然后继续执行 `case 2` 下面的代码,输出结果为 “GL”。
最后,建议在每个 `case` 后面加上 `break`,以避免不必要的错误。
int main() { int choice; do { cout << "1.增加人员信息" << endl; cout << "2.删除人员信息" << endl; cout << "3.修改人员信息" << endl; cout << "4.查找人员信息" << endl; cout << "5.保存人员信息" << endl; cout << "6.读取人员信息" << endl; cout << "0.退出系统" << endl; cout << "请输入你的choice" << endl; cin >> choice; switch (choice) { switch (choice) { case 1: { string id, name, dept, grade, group, pos; cout << "Enter student ID: "; cin >> id; cout << "Enter name: "; cin >> name; cout << "Enter department: "; cin >> dept; cout << "Enter grade: "; cin >> grade; cout << "Enter group: "; cin >> group; cout << "Enter position: "; cin >> pos; Member member(id, name, dept, grade, group, pos); team.addMember(member); cout << "Member added successfully." << endl; break; } case 2: { string id; cout << "Enter student ID to delete: "; cin >> id; team.deleteMember(id); cout << "Member deleted successfully." << endl; break; } case 3: { string id, group, position; cout << "Enter student ID to modify: "; cin >> id; cout << "Enter new group: "; cin >> group; cout << "Enter new position: "; cin >> position; team.modifyMember(id, group, position); cout << "Member modified successfully." << endl; break; } case 4: team.displayMembers(); break; case 5: team.saveToFile(); break; case 0: cout << "Exiting program." << endl; break; default: cout << "Invalid choice. Please try again." << endl; break; } } while (choice != 0); return 0; } 这段代码错误该怎么改
这段代码有一些语法和逻辑上的错误。下面是修改后的代码:
```cpp
#include <iostream>
#include <string>
#include "Member.h" // 假设Member类的定义在Member.h文件中
#include "Team.h" // 假设Team类的定义在Team.h文件中
int main() {
int choice;
Team team;
do {
cout << "1.增加人员信息" << endl;
cout << "2.删除人员信息" << endl;
cout << "3.修改人员信息" << endl;
cout << "4.查找人员信息" << endl;
cout << "5.保存人员信息" << endl;
cout << "6.读取人员信息" << endl;
cout << "0.退出系统" << endl;
cout << "请输入你的choice: ";
cin >> choice;
switch (choice) {
case 1: {
string id, name, dept, grade, group, pos;
cout << "Enter student ID: ";
cin >> id;
cout << "Enter name: ";
cin >> name;
cout << "Enter department: ";
cin >> dept;
cout << "Enter grade: ";
cin >> grade;
cout << "Enter group: ";
cin >> group;
cout << "Enter position: ";
cin >> pos;
Member member(id, name, dept, grade, group, pos);
team.addMember(member);
cout << "Member added successfully." << endl;
break;
}
case 2: {
string id;
cout << "Enter student ID to delete: ";
cin >> id;
team.deleteMember(id);
cout << "Member deleted successfully." << endl;
break;
}
case 3: {
string id, group, position;
cout << "Enter student ID to modify: ";
cin >> id;
cout << "Enter new group: ";
cin >> group;
cout << "Enter new position: ";
cin >> position;
team.modifyMember(id, group, position);
cout << "Member modified successfully." << endl;
break;
}
case 4:
team.displayMembers();
break;
case 5:
team.saveToFile();
break;
case 6:
team.readFromFile();
break;
case 0:
cout << "Exiting program." << endl;
break;
default:
cout << "Invalid choice. Please try again." << endl;
break;
}
} while (choice != 0);
return 0;
}
```
在这个修改后的代码中,主要做了以下几个修改:
1. 添加了头文件 `Member.h` 和 `Team.h`,假设 `Member` 和 `Team` 类的定义分别在这两个头文件中。
2. 修正了 `switch` 语句的嵌套错误,移除了多余的 `switch` 关键字。
3. 在 `case 6` 中添加了调用 `team.readFromFile()` 的代码,用于读取人员信息。
4. 修正了 `do-while` 循环的位置,使得用户输入的选项能够正确地被处理。
请根据具体情况进行适当的调整,并确保相关的类和函数的定义和实现已经正确完成。