The user enters the decimal integer and specifies the target numeral system base. The calculator then converts the integer to the target numeral system, which can be binary, octal, hexadecimal, or any other base up to 36. For bases greater than 10, capital English alphabet letters are used, i.e. A - 10, B - 11, and so on, up to Z - 35. The resulting conversion is displayed as a string of digits or digits and letters, representing the converted integer in the specified numeral system.
For example, if the user enters the decimal integer 255 and selects the target numeral system base 16, the calculator will convert the number to the hexadecimal system, which is commonly used in computer programming. The resulting output will be "FF", which is the hexadecimal representation of the decimal number 255.