C ++ char数组传递给函数

Question

Hey guys, I need help with this one. I'm writing a really basic program that will generate a character array firstName[amount][size]. using this it will then pass it to the function addPerson and that will modify the value.

Here's my current code

void deletePerson(int &, int, char[], char[], char[], char[]);
int main()
{
char firstNames[100][25], lastNames[100][25], email[100][50], phone[100][16];
else if (userChoice == 'D')
    {
        deletePerson(count, amount, &firstNames,&lastNames,&email,&phone);
    }
}
void deletePerson(int count, int amount, firstNames&, lastNames&,email&,phone&);
{
//blahblahblah
}

I know that it's wrong and pardon my newbieness. I had it working to a point where it only had on error but then i decided to change everything. Anyway, I hope you get the point of what i'm trying to say. Basically i Need to pass the array and have it modified inside the function. How might i go about that?

Thanks!

edit: Ok so i can't use global variables either, that'd be too easy.

I edited the code to get rid of the &. it gives me

error LNK2019: unresolved external symbol "void __cdecl deletePerson(int &,int,char (* const)[25],char (* const)[25],char (* const)[50],char (* const)[16])" (?deletePerson@@YAXAAHHQAY0BJ@D1QAY0DC@DQAY0BA@D@Z) referenced in function _main

my new code looks like

void deletePerson(int &, int, char[][25], char[][25], char[][50], char[][16]);
int main()
{
char firstNames[100][25], lastNames[100][25], email[100][50], phone[100][16];
else if (userChoice == 'D')
        {
            deletePerson(count, amount, firstNames,lastNames,email,phone);
        }
}
void deletePerson(int count, int amount, char firstNames[100][25], char lastNames[100][25],char email[100][50],char phone[100][16])
{
    int position; //the place where the person is in the array
    position = searchName(count, amount, lastNames);
    if (position != -1)
    {
    }


}

Answer 1

I think you should really avoid using char arrays and char pointers. Use std::vector and std::string instead, they will save you a lot of trouble. std::vector<std::string> is probably all you need. Or even better, you should bundle firstName, lastName, email and phone together in a structure.

struct Person
{
    std::string firstName;
    std::string lastName;
    std::string email;
    std::string phone;
}

void deletePerson(std::vector<Person>& persons)
{
    int position = searchName(lastNames); // you could replace this with std::find
    if (position != -1)
    {
    }
}

Answer 2

Try this:

It uses the template argument deduction and references to simplify things. It works in case you change the dimensions of your arrays for whatever reason without changing the function (and possibly the logic).

template<class T, int N1, int N2, int N3, int N4, int N5, int N6, int N7, int N8>
void deletePerson(int &, int, T(&r1)[N1][N2], T(&r2)[N3][N4], T(&r3)[N5][N6], T(&r4)[N7][N8]){} 

int main() 
{ 
   char firstNames[100][25], lastNames[100][25], email[100][50], phone[100][16]; 
   int count = 100;
   deletePerson(count, 20, firstNames, lastNames, email, phone); 
}