Error converting parameter in C++
<p>Header file</p>

<pre><code>#include &lt;iostream&gt;
#include &lt;cstring&gt;

const unsigned MaxLength = 11;

class Phone {
public:

    Phone(const char *phone) {
    setPhone(phone);
    }

    void        setPhone(const char Phone[ ]);
    const char* getPhone();

private:
    char phone[MaxLength+1];
};
</code></pre>

<p>Cpp file</p>

<pre><code>#include "Phone.h"
#include &lt;iostream&gt;
#include &lt;ctype.h&gt;
#include &lt;cstring&gt;
#include &lt;cstdlib&gt; 

using namespace std; 
bool checkNum(const char* num);

void Phone::setPhone(const char Phone[ ]) {
    strncpy(phone, Phone, MaxLength);
    phone[MaxLength] = '\0';
}

const char* Phone::getPhone() {
    return phone;
}


int main() {
    Phone i1("12345678901");

    cout &lt;&lt; i1.getPhone() &lt;&lt; endl;
    if (checkNum(i1.getPhone())) 
        cout &lt;&lt; "Correct" &lt;&lt; endl;
    else 
        cout &lt;&lt; "Invalid Wrong" &lt;&lt; endl;

}

bool checkNum(const char* num) {
    bool flag = true;
        if (atoi(num[0]) == 0)
            flag = false;
    return flag;
}
</code></pre>

<p>When I tried to compile, I get this error:</p>

<blockquote>
  <p>error C2664: 'atoi' : cannot convert
  parameter 1 from 'const char' to
  'const char *' 1>        Conversion
  from integral type to pointer type
  requires reinterpret_cast, C-style
  cast or function-style cast</p>
</blockquote>

<p>I am trying to read the first element of the array as an int so I can compare it using the atoi function. I am having a parameter mismatch but I can't find where it is. Any idea what's wrong?</p>
