```c++ #include <iostream> #include <string> #include <vector> using namespace std; struct Person { int id; string name; int age; char gender; }; vector<Person> persons = { {1, "Tom", 20, 'M'}, {2, "Lucy", 25, 'F'}, {3, "Bob", 30, 'M'}, }; printPerson(Person p) { cout << p.id << "\t" << p.name << "\t" << p.age << "\t" << p.gender << endl; } void queryByName(string name) { bool found = false; for (auto& p : persons) { if (p.name == name) { printPerson(p); found = true; } } if (!found) { cout << "No person with that name." << endl; } } int main() { cout << "ID\tName\tAge\tGender" << endl; for (auto& p : persons) { printPerson(p); } string name; cout << "Enter a name to query: "; cin >> name; queryByName(name); return 0; }这段代码有问题么

是的，这段代码有两个问题。

第一个问题是，在printPerson函数的定义中缺少返回类型。应该在函数定义前加上返回类型，例如void。

第二个问题是，在printPerson函数的调用中缺少参数。应该在函数名后加上括号并传入一个Person类型的参数，例如printPerson(p)。

以下是修正后的代码：

#include <iostream>
#include <string>
#include <vector>

using namespace std;

struct Person {
    int id;
    string name;
    int age;
    char gender;
};

vector<Person> persons = {
    {1, "Tom", 20, 'M'},
    {2, "Lucy", 25, 'F'},
    {3, "Bob", 30, 'M'},
};

void printPerson(Person p) {
    cout << p.id << "\t" << p.name << "\t" << p.age << "\t" << p.gender << endl;
}

void queryByName(string name) {
    bool found = false;
    for (auto& p : persons) {
        if (p.name == name) {
            printPerson(p);
            found = true;
        }
    }
    if (!found) {
        cout << "No person with that name." << endl;
    }
}

int main() {
    cout << "ID\tName\tAge\tGender" << endl;
    for (auto& p : persons) {
        printPerson(p);
    }
    string name;
    cout << "Enter a name to query: ";
    cin >> name;
    queryByName(name);
    return 0;
}