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C-/C++-Quelltext

bool isDigitNN(char* pChar);
bool isDigit(char* pChar);
bool isNumber(char* pLine);

bool isDigitNN(char* pChar)
{
    switch(*pChar)
    {
         case '1':
         case '2':
         // ... 
         case '9':
             return true;
         default:
             false;
    }
}

bool isDigit(char* pChar)
{
    return ('0' == pChar) || isDigitNN(pChar);
}


bool isNumber(char* pLine)
{
            bool    bProcessing     = true;
            char*   pCurrentChar    = pCode;
            std::cout << pCurrentChar << std::endl;
            if(isDigitNN(pCurrentChar))
                while(bProcessing)
                {
                    pCurrentChar = pCurrentChar++;
                    std::cout << pCurrentChar << std::endl;
                    if('\0' == pCurrentChar)
                        return true;
                    else if(isDigit(pCurrentChar))
                        continue;
                    else
                        return false;
                }
}