C program to convert Roman number to Decimal number - My CS Tutorial

C program code to convert roman numeral into decimal number.
In this tutorial we will learn how to write a c program code that convert roman number to decimal number.
In this program we will enter a Roman number then it converts into Decimal number.

Program Description:

This program is a c program that convert Roman number to Decimal number.It takes input Roman number and convert it into Deciaml number.

We will use capital letters for Roman number.

C program code

#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
int a[100],len,x,y,z;
char rom[100];
printf("\n Enter the Roman Numeral for conveting to decimal:\n ");
scanf("%s",rom);
len=strlen(rom);
for(x=0; x<len; x++)
    {
     if(rom[x]=='I')
     a[x]=1;
     else if(rom[x]=='V')
     a[x]=5;
     else if(rom[x]=='X')
     a[x]=10;
     else if(rom[x]=='L')
     a[x]=50;
     else if(rom[x]=='C')
     a[x]=100;
     else if(rom[x]=='D')
     a[x]=500;
     else if(rom[x]=='M')
     a[x]=1000;
     else
     {
     printf("\n Invalid Value.");
     exit(0);
     }
 }
     z=a[len-1];
     for(x=len-1; x>0; x--)
    {
     if(a[x]>a[x-1])
     z=z-a[x-1];
     else if(a[x]==a[x-1] || a[x]<a[x-1])
     z=z+a[x-1];
     }
     printf("\n Its Decimal Equivalent is:\n ");
     printf("%d\n",z);
   
     return 0;
 }

OUTPUT:

In this output we can see that it converts Roman number into Decimal number.
If we will enter the roman number as XXVII.
Then its convert this Roman number into Decimal number as 27.

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Created by-- HARSH CHAUHAN