Introduction
This code is used to do integer calculation. There are several help functions. such as convert_digits, is_greater,is_equal. In addition there are also some calculation functions, such as plus_digits, minus_digits, shift_left_digits, multiplies_digit, multiplies_digits, divides_digits, shift_right_digits.
Details
For the help functions: (1)convert_digits: this code is used to change digit to digits. For example, from 123 to 1,2,3 (2)is_greater: this code is used to test which digits is longer than others. (3)is_equal: this code is used to test two digits are equal to each other or not.
For the calculation functions (1)plus_digits: this code is used to do addition. (2)minus_digits: this code is used to do minus calculation. (3)shift_left_digits: this code is used to do digits shift left. (4)multiplies_digit: this code is used to do multiplication about digit. such as 123*12 (5)multiplies_digits: this code is used to do multiplication about digits. such as 1,2,3*1,2 (6)divides_digits:this code is used to do divide calculation. (7)shift_right_digits:this code is used to do digits shift right. (8)operator,==,<=,>=,!= etc.