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Following are some C++ code which could be used as methods inside a class or as functions and procedures at a structure design program.

int MyLibrary::GetRandomNo()
/*This method create a random no in range of 1 to 10000(change this no to get the random no in that range) and return it.*/
{
  int randomNo;

  srand(time(0));
  randomNo = 1+ rand() % 10000;
  return randomNo;
}



int MyLibrary::StringToInteger(string Key)
/* this method converts a string to an integer. It assumed the integer is in range of 1 to 10000. */
{
  int Len;
  bool KeyOk = true;
  int num;
  int mulby;
  int intKey=0;

  Len = Key.length(); // to get string length
  for(int i=0; i < Len; ++i)
  {
    /*if any characters in the string is not a digit the whole string is not an integer. */
    if(isdigit(Key[i]) == false )
      KeyOk = false; //the string is not an integer
  }
  if(KeyOk == true) // if the string is an integer
  {
    for(int j=0; j < Len; ++j) // change key from string to integer
    {
      num = GetInt(Key[j]); // get the equivalent integer number for each individual character
      mulby = GetFactor(Len - j); // get the number to be multiply by
      intKey = intKey + (num * mulby); // in process to integer number
    }
  }
  return intKey; // return the completed integer number
}



int MyLibrary::GetInt(char ch)
// this method converts a character number to an integer.
{
  return (int(ch) - int('0'));
}



int MyLibrary::GetFactor(int Factor)
/* this method return a number for multiplication. Factor is the position of a number in its integer number. */
{
  int num;

  /* Factor can not be more than 5, because GetRandomNo() method creates a random number in the range of 1 to 10000.*/

  switch (Factor)
  {
    case 5: num = 10000; // if a digit in string has the poistion of 5
    break;
    case 4: num = 1000; // if a digit in string has the poistion of 4
    break;
    case 3: num = 100; // if a digit in string has the poistion of 3
    break;
    case 2: num = 10; // if a digit in string has the poistion of 2
    break;
    case 1: num = 1; // if a digit in string has the poistion of 1
    break;
  }
  return num;
}



 
 
 

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