Sum Issue

[Serge1005]

Hello I am working on a roman number to decimal program. My code works a bit for example when I type MIII my output is 1003, but then I type MX I get 10. Any reason why this happening?

 #include<iostream>
#include<string>

using namespace std;



int main() {

    string roman;
	int sum;
    int decimal = 0;

	
    cout << "Please enter a Roman Numeral to convert: ";

     cin >> roman;
	 
	 for (int i=0; i<roman.length(); i++)
		 {
			 switch (roman[i])
			 {
			 case 'M':
			  
				 decimal = 1000;
				 break;
			 case 'D':
				 decimal = 500;
				 sum = decimal;
				 break;
			 case 'L':
				 decimal  = 50;
				 break;
			 case 'X':
				 decimal = 10;
				 break;
			 case 'V':
				 decimal = 5;
				 break;
			 case 'I':
				 decimal ++;
				
				 break;
			 }
			
		 }
	  cout << decimal << endl;
	
}

[E0p9LyTq]

In all of your cases except for the 'I' case you are assigning a new value to decimal, you should be adding the value:

#include<iostream>
#include<string>

using namespace std;

int main()
{
   cout << "Please enter a Roman Numeral to convert: ";
   string roman;
   cin >> roman;

   int decimal = 0;

   for (unsigned int i = 0; i < roman.length(); i++)
   {
      switch (roman[i])
      {
      case 'M':
         decimal += 1000;
         break;

      case 'D':
         decimal += 500;
         break;

      case 'C':
         decimal += 100;
         break;

      case 'L':
         decimal  += 50;
         break;

      case 'X':
         decimal += 10;
         break;

      case 'V':
         decimal += 5;
         break;

      case 'I':
         decimal++;
         break;
      }
   }
   cout << decimal << endl;
}

Please enter a Roman Numeral to convert: MXVI
1016

[Serge1005]

You are a Life Saver! Thank Thank You so Much