Hex number to base 10

How do I convert the hex to a decimal base 0 to 9.

void Display_Result(void)
{

      LCD_Char_Position(0,6);
      LCD_Char_PrintInt8(HYT221_Read_Buff[0] & 0x3f);         //Mask HYT humidity the highest two status bits
      LCD_Char_PrintInt8(HYT221_Read_Buff[1]);
      LCD_Char_PrintNumber(unit8,HYT221_Read_Buff);
      temp = astio(temp, HYT221_Read_Buff[1], 16);
      LCD_Char_PrintString("      ");
      LCD_Char_Position(1,6);
      LCD_Char_PrintInt8(HYT221_Read_Buff[2]);
      LCD_Char_PrintInt8(HYT221_Read_Buff[3] & 0xfc);       //Mask HYT temperature the lowest two status bits
      LCD_Char_PrintString("      ");
}

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