The program first checks for the validity of the roman number entered by the user using two consecutive if conditions as discussed in the rule above. While function is used to access every digit in the Roman number that is stored in the character array romanNumber. In the above program, we have included string.h library to use standard string library function strlen that is used to determine the length of the roman number. converting roman number into equivalent decimal value Printf("\nEquivalent decimal number: %d\n", num) Num = num + (convert(romanNumber) - convert(romanNumber)) If(convert(romanNumber) = convert(romanNumber)) //true is first roman number is greater or equal to second if condition for checking validity of roman number Int convert(char) //function prototype of conversion functionĬhar romanNumber //array for storing roman number C program to convert roman number to decimal number //C program to convert roman numbers into decimal Now, let’s write C code to convert the roman number into the decimal number using above rules. You will need to have sound knowledge of following articles for proper understanding. Writing the smaller number to the left of the larger number in the Roman system represents subtraction. If roman numbers are in decreasing order from left to right it represents an addition of the numbers. Repeating a roman numeral up to three times represents the addition of the number whereas, V, L, and D cannot be repeated. Roman numbers are represented by the following characters: I, V, X, L, C, D, Mīefore writing the code, you should understand how roman number work and their rules: In this example, you will in depth about C program to convert roman number into decimal number with proper explanation.Ĭ program to convert roman number into its equivalent decimal number
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