solution manually

Problem: Develop a solution to change Roman numerals into their decimal equivalents. Consider all possibilities of Roman numerals - no letters, only one letter, two letters, and so forth. Assume that the Roman numerals are in correct order. One Roman numeral character is entered at a time. The Roman numeral is entered from left to right. Roman numeral equivalents are as follows: I=1V=5X=10L=50C=100D=500M=1000 Examples of input numbers are IV, XIX, MMCDXL, and CCLV. The solution must be presented using Straight, Positive, Negative and Switch and Case logic structure whit it respective flowchart and pseudocodes