URGENT Need to pass up my assingment in 1 hour

[MulStudent]

#include <stdlib.h>
#include <iostream>

using namespace std;

void cmTOinch (){
float a,b;
cout << "Please enter how many cm.\n";
cin >> a;
system("cls");
b= a*.39;
cout <<"\n\n"<< a<<" centemeter(s) would be equal to "<<b<<" inche(s).\n\n";
system("PAUSE");
}

void inchTOcm (){
float a,b;
cout << "Please enter how many inches.\n";
cin >> a;
system("cls");
b= a*2.54;
cout <<"\n\n"<< a<<" inche(s) would be equal to "<<b<<" centemeter(s).\n\n";
system("PAUSE");
}


int main () {

int cmORinch, Restart;
float cm, in;

do {
system("cls");
cout << "What operation do you want to execute? \n Press 1 to convert cm to inch.\n Press 2 to convert inch to cm. \n";
cin >> cmORinch;

system("cls");
if (cmORinch == 1){
cmTOinch ();
}
if (cmORinch == 2){
inchTOcm ();
}
else{
system("cls");
cout << "Please press 1 or 2 "<<cmORinch<<endl;
system("PAUSE");
}

system("cls");
cout << "Press 1 to restart.\nOtherwise press any button to quit.";
cin >> Restart;}
while (Restart==1);



return EXIT_SUCCESS;

}


those are my source code but i need to use these function :

readData - reads the input in inch and return the value to main()
convert - converts the input inch into centimeter and return it to main()
display - prints out the centimeter value

can someone help me please

[Repeater]

Fetching data from keyboard:

int fetchDataFromKeyboard()
{
  int x;
  cin >> x;
  return x;
}

Seriously, this is not difficult and a simple search would have found that. Put some effort in. Copying code from http://www.dreamincode.net/forums/topic/35332-cm-to-inch-converter/ and then coming here to ask someone else to do the rest for you is basically doing nothing yourself. The time you wasted asking could have been used to learn.