Conversion of Roman Numeral to Decimal Number.

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 As I have explain in my Previous Blog that what is Roman Numeral, what is Decimal Number. So in this blog I am not going to explain these stuff in this blog. If you have not read my previous blog then Click Me to read it then only you will able to understand this blog.









Programming:-


#include<stdio.h>
#include<string.h>
int decimal(char c)
{
int count;
switch(c)
{
case 'I' :
count = 1;
break;
case 'V' :
count = 5;
break;
case 'X': 
  count = 10; 
break;
         case 'L': 
  count = 50; 
break;
         case 'C': 
  count = 100; 
break;
         case 'D': 
  count = 500; 
break;
         case 'M': 
  count = 1000; 
break;
         case '\0': 
  count = 0; 
  break;
         default: 
  count = -1;
break; 
}
return count;
}
int main()
{
char roman[1000];
int num = 0,i = 0;
printf("Enter the Roman Numeral");
scanf("%s",roman);
while(roman[i])
{
if(decimal(roman[i]) < 0)
{
printf("Invalid Roman Numeral");
}
if(strlen(roman) -i > 2)
{
if(decimal(roman[i]) < decimal(roman[i+2]))
{
printf("Invalid Roman Numeral");
}
}
if(decimal(roman[i]) >= decimal(roman[i+1]))
{
num = num + decimal(roman[i]);
}
else
{
num = num + decimal(roman[i+1]) - decimal(roman[i]);
}
i++;
}
printf("%d is the Decimal value",num);
return 0;
}

Output:- 



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