I need to write a program

Question

Task: Write a program that uses a pointer to a character string in a function to determine the number of characters in a string using structures.

The compiler throws an error:

error: invalid conversion from 'char' to 'const char*' [-fpermissive]
    8 |     cout << strlen(a);
      |                    ^
      |                    |
      |                    char

This is my code:

#include <iostream>
#include <cstring>

using namespace std;

void func(char a)
{
    cout << strlen(a);

}

int main()
{
    struct student
    {
        char name[64];
    };
    student student1;
    cin >> student1.name;
    char* ptr = &student1.name[64];
    func(*ptr);
    return 0;
}

Answer 1

There are several invalid constructions in the program.

You have at least to write instead

void func( const char *a )
          ^^^^^^^^^^^^^^

and

char* ptr = student1.name;
func(ptr);

And instead of

cin >> student1.name;

it is better to use

cin.get( student1.name, sizeof( student1.name ) );

Also it seems you are not allowed to use the standard C function strlen and must write an equivalent function yourself.