Question

Make the roman project the startup project. Create a function letterToInt with the following interface:

int      letterToInt( char letter )

This function should accept a character value as a parameter. This variable represents one symbol in a roman numeral. Your function should return the integer equivalent (e.g., if you pass the function an 'X', it would return the number 10). The function should return -1 if the letter passed to it is not a valid letter in a roman numeral.

Additional Requirements:

• Use a switch statement in your function.
• Your function should contain only one return statement.

Write a main() function to test your function.

The valid roman numerals and their meanings are:

I - 1

V - 5

X - 10

L - 50

C - 100

M - 1000

NOTE: This function does not need to handle a complete roman number such XIV; it only handles one digit Roman Numerals.

Answer 1

#include<iostream>
using namespace std;
int letterToInt( char letter ){
   int res=-1;
   switch(letter){
       case 'I':res=1;break;
       case 'V':res=5;break;
       case 'X':res=10;break;
       case 'L':res=50;break;
       case 'C':res=100;break;
       case 'M':res=1000;break;
   }
   return res;
}
int main(){
   cout<<letterToInt('M')<<endl;
   cout<<letterToInt('C')<<endl;
   cout<<letterToInt('X')<<endl;
  
}

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