How to write a program ,in C,which inputs two numbers specified in Roman numerals and outputs the sum of these two numbers in Roman numerals,no matter with capitals or not?
im interested in Using arrays to store the input numbers (character sequences) and utilizing functions to do error checking and array-processing

example
input:CCCXi+CxXViIi
output:CDXXXIX


input: DCCXiv+DccciV
output:MDXVIII


input:MLxvII+Mmiii
output:MMMLXX

Code:
•	I =1			i =1
•	V = 5			v =5
•	X = 10		x =10
•	L = 50		l =50
•	C = 100		c = 100
•	D = 500		d = 500
•	M = 1000		m = 1000