g Converting Roman Numerals to Decimals We implement the aforementioned five rules to change a Roman string to an integer. We can see the similarity between changing a binary string to a Roman string. We use two validations. First, we check that the Roman string uses only the seven characters that are allowed. Second, if the resulting decimal value is larger than 3888, we terminate the program with a message that the number is invalid: Design the Algorithm We create two variables, pre and cur, to keep track of the values of the previous character and the current character. If pre is smaller than the cur, we should have subtracted the corresponding value in the previous iteration instead of adding. This means that now we need to subtract twice the value pre from the decimal value. Before printing the value, we make sure that it is less than 3889. If not, we terminate the program. Write the code of Converting a Roman literal to a decimal integer