!!help!!!!!

i need to know how i would have an array of letters/numbers, and when i read it, if it finds a letter, changer it to a number, heres what i have... the ****** is where i need help.

#include <iostream.h>
#include<apvector.h>

char number[25];
char NewNumber[25];
int main()
{
int i;
cout<<"Enter the phone number ==>: ";
cin.getline(number,80);

for(i=0;i<26;i++)

*********find if letter, make it a number i.e. a,b,c, = 2**********
cout<<number[i];


cout<<"\nThe original number is : "<<number<<"\n";

return 0;
}

thanks

Something like this would work:

I am hand writing this without checking it

PHP Code:

---

for(i=0;i<26;i++)
{
switch(number[i])
{
  case 'a':
  case 'b':
  case 'c':
     number[i] = '2';
     break;

  case 'd':
  case 'e':
  case 'f:
     number[i] = '3';
     break;
//.......I think you can take it from here
}
} 


---

more memory, but less code and faster execution would be a lookup table (see the code below)

Then you can index into the field with the uppercase letter - 'A' or the lowercase letter - 'a':

Before I list my code, here are some errors of yours:
char number[25];
cin.getline(number,80);
You have a buffer that can hold a max of 24 characters (size - 1), and then you specify a max of characters read of 80. That cries for an overflow.

for(i=0;i<26;i++)
Valid indices in an array of size n are 0 to n-1. You travel from 0 to n. Another access violation.

Another thing: always wrap your code in [ code] [/code ] tags and indent it when posting here. Makes it more readable and some people won't answer your question if you don't.
Here's my code (not complete):

Code:

---

#include <iostream>  // !!!
#include <vector> // !!!
#include <cctype> // for the is* and to* macros
using namespace std;

// the lookup table
char numOfChar[] =
  { '2', '2', '2', '3', '3', '3', '4', '4', '4', '5', '5', '5', '6', '6', '6',
    '7', '7', '7', '7', '8', '8', '8', '9', '9', '9', '9' };
// ...
for(char* p = number; *p, p++)
{
  if(!isdigit(*p))
  {
    if(isalpha(*p))
    {
      *p = numOfChar[(toupper(*p) - 'A')];
    }
    else
      cerr << "Invalid character in number" << endl;
  }
}
// ...

---