error C2065: undeclared identifier

**decxan** · 02-14-2011

Hi,

I'm having trouble with some code. I'm trying to reverse a string stored in a char array but I keep on getting the following errors:

1>z:\visual studio 2008\projects\c++lab4test2\c++lab4test2\c++lab4tes t2.cpp(50) : error C2065: 'reverse' : undeclared identifier
1>z:\visual studio 2008\projects\c++lab4test2\c++lab4test2\c++lab4tes t2.cpp(50) : error C2065: 'howMany' : undeclared identifier

Code:

#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;

using std::cout;
using std::endl;

const int max_len = 300;
class mystring

{
public:
void reverseWord(char str [], char reverse [], int howMany);
int length();
void print();
friend mystring operator+ (const mystring& a, const mystring& b);
private:
char s[max_len];
int len;
};

// Member functions of the mystring class
void mystring::reverseWord(char str [], char reverse [], int howMany)
{

for (int i = howMany -1,j=0; i>=0; i--,j++)
reverse[j] = str[i];
len = strlen(s);
}
int mystring::length()
{
return (len);
}

void mystring::print()
{
cout << s << "\nLength: " << len << "\n";
}
// Prototype of a general function (not a
// member of the mystring class)
void print(char* str);

// The program’s main function

int main()
{
char str[] = "My name is Charles Babbage.";
mystring one;
one.reverseWord(str, reverse, howMany);
print(str);
one.print();
}

I kow the problem is on this line:

one.reverseWord(str, reverse, howMany);

But if I remove reverse and howMany the I get this error:

error C2660: 'mystring::reverseWord' : function does not take 1 arguments

Apologies about the code being a mess, still struggling with the language.

**codeprada** · 02-14-2011

next time please take out the unnecessary code before posting. also you should read up on classes and passing pointers, passing variables by value and by reference. comes in very handy for code like this

There you go

Code:

#include <iostream>
#include <string>
#include <string.h> //Code::Blocks seems to need it -__-

using namespace std;

const int max_len = 300;
class mystring

{
public:
    char * reverseWord(char * str);
    int length(char * str);
    void print();
    friend mystring operator+ (const mystring& a, const mystring& b);
private:
    char s[max_len];
    int len;
};

// Member functions of the mystring class
char * mystring::reverseWord(char * str)
{
    len = this->length(str);
    char * reverse = new char[len];
    for (int i = len - 1,j=0; i >= 0; i--,j++)
        reverse[j] = str[i];
    reverse[len] = '\0';
    return reverse;
}

int mystring::length(char * str)
{
    int len = 0;
    while (*(str++))
        len++;
    return len;
}

void mystring::print()
{
    cout << s << "\nLength: " << len << "\n";
}
// Prototype of a general function (not a
// member of the mystring class)
//void print(char* str);

// The program’s main function

int main()
{
    char str[] = "My name is Charles Babbage.", *reverse;
    mystring one;
    reverse = one.reverseWord(&str[0]);
    cout << reverse << endl;
    //one.reverseWord(str, reverse, howMany);
    //print(str);
    //one.print();
}

**decxan** · 02-14-2011

Will do, theres definately a lot of stuff I need to read up on! Thanks codeprada

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