카타 8급 Hex to Decimal

1 C

int hex_to_dec(const char *syntaxhighlight) {
  return strtol(syntaxhighlight, 0, 16);
}

int hex_to_dec(const char *syntaxhighlight) {
  int len = strlen(syntaxhighlight);
  int res = 0;
  for(int i=0; i<len; i++) {
    res *= 16;
    if( isdigit(syntaxhighlight[i]) ) res += syntaxhighlight[i]-48;
    else res += syntaxhighlight[i]-87;
  }
  return res;
}

2 C++

int hexToDec(const std::string& hexString)
{
  return stoi(hexString, nullptr, 16);
}

int hexToDec(std::string hexString)
{
  return (int)strtol(hexString.c_str(), 0, 16);
}

int hexToDec(std::string hexString)
{
  int n;
  std::stringstream(hexString) >> std::hex >> n;
  return n;
}

int hexToDec(std::string hex)
{
  int decValue;
  sscanf(hex.c_str(), "%x", &decValue); 
  return decValue;
}

int hexToDec(std::string hexString)
{
    int len = hexString.length(); 
    int base = 1; 
    int ret = 0; 
    int sign = 1;
    for (int i=len-1; i>=0; i--) {    
        char c = hexString.at(i);
        if( c == '-' ) {
          sign = -1;
          break;
        }
        if (c>='0' && c<='9') ret += (c-48)*base; 
        else if (c>='A' && c<='F') ret += (c-55)*base; 
        else if (c>='a' && c<='f') ret += (c-87)*base; 
        base *= 16; 
    }
    return sign * ret;
}

3 같이 보기

• 함수 hex2dec()