Your problem is not to convert int to char if I'm correct. You only need to check the input with

int isdigit(int character);

link (http://www.acm.uiuc.edu/webmonkeys/book/c_guide/2.2.html)

You made a little mistake with your link. No big deal just test it and U will understand :)

This is not enoughf information. Post your code.

Change the constructor to

rectangle()
{
length = 1;
width = 1;
} //constructor sets length and width defaults to 1

or

Hm never seen that (probably becouse I'm not c++ programmer). But the book never lies. Make a test just leave the construtor and what will the copiler tell U

Yuo should run throught tutorial. You should know the diffrence from set and get. For example

float getLength(float)
{
float Len;
cout << "Enter the length: ";
cin...

And the question is?

Did you tried cin.ignore after cin.get(ifname, 150); ?

Why don't you use the compiler to check the code. Do you have question?
check.cpp: In function `bool checker(int)':
check.cpp:19: warning: control reaches end of non-void function
Thats after my...

I don't think that someone will provide you the source code. Try at google. I bet that you will find something

#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;
void decToBin(int number, int base);
int main()
{
cout<<"Enter a string: ";
string name;
...

be carefull, the size of buffer is 2 bytes and U assigned 3 bytes so this is a bug.

On google I found many links (typed KNOPPIX). Use google and find links wich are interesanting to you. For example maybe this link is interesanting
http://www.shockfamily.net/cedric/knoppix/ ...

Use some editor to create example x.cpp.
Then try to compile with g++ -o x x.cpp (without additional library) and run it with ./x command. Type this lines in console. If error occures then use...