关于c ++：找出指针和结构

figure out pointers and structs

我一直在想如何处理指针和结构。我写了以下代码。

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#include <iostream>

using namespace std;

struct Person
{
char name[20]; //Question 2
int id;
};

const int max_num_of_childs=10;

struct Family
{
Person dad;
Person mom;
int num_of_childs;
Person* child[max_num_of_childs];
};

void add_child (Family& f)
{
char answer;
do
{
if (f.num_of_childs==max_num_of_childs)
{
cout <<"no more children" <<endl;
return;
}

cout <<"more child? Y/N" <<endl;
cin >> answer;
if (answer == 'Y')
{
f.child[f.num_of_childs] = new Person;
cout <<"enter name and id" << endl;
cin >> f.child[f.num_of_childs]->name;
cin >> f.child[f.num_of_childs]->id;
f.num_of_childs++;
}
}
while (answer=='Y');

return;
}

void add (Family& f)
{
cout <<"insert dad name & id" << endl;
cin >> f.dad.name >> f.dad.id;

cout <<"
insert mom name & id" << endl;
cin >> f.mom.name >> f.mom.id;

add_child (f);
}

void print_child (const Family f) //Question 1
{
for (int i=0; i<f.num_of_childs; i++)
cout <<"#" << i+1 <<"child name:" << f.child[f.num_of_childs]->name <<"child id:" << f.child[f.num_of_childs]->id << endl;
}

void print (const Family f)
{
cout <<"dad name:" << f.dad.name <<"\tdad id:" << f.dad.id << endl;
cout <<"mom name:" << f.mom.name <<"\tmom id:" << f.mom.id << endl;
print_child (f);
}

int main()
{
Family f;
f.num_of_childs=0;
add(f);
print(f);

return 0;
}

为什么print_child()的输出乱七八糟？

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dad name: AAAA dad id: 11
mom name: BBBB mom id: 22
1child name: ? U?∞ u u u h?├evhchild id: 6846053
2child name: ? U?∞ u u u h?├evhchild id: 6846053

号

如何定义长度不受限制的字符数组？(使用字符串还需要定义的长度)。