Oct 12, 2011

C Program to convert a Roman numeral to its decimal equivalent.

C Program to convert a Roman numeral to its decimal equivalent. Roman numbers are the oldest number system used in ancient Rome. They use the combination of letters from Latin alphabet to represent the system. We used the if-else and for statements to solve this problem. Read more about C Programming Language .
/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                                  Happy Coding
***********************************************************/



#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>

void main()
{

 int *a,len,i,j,k;
 char *rom;

 clrscr();

 printf("Enter the Roman Numeral:");
 scanf("%s",rom);

 len=strlen(rom);

 for(i=0;i<len;i++)
 {
  if(rom[i]=='I')
   a[i]=1;
  else if(rom[i]=='V')
   a[i]=5;
  else if(rom[i]=='X')
   a[i]=10;
  else if(rom[i]=='L')
   a[i]=50;
  else if(rom[i]=='C')
   a[i]=100;
  else if(rom[i]=='D')
   a[i]=500;
  else if(rom[i]=='M')
   a[i]=1000;
  else
  {
   printf("\nInvalid Value");
   getch();
   exit(0);
  }
 }
 k=a[len-1];
 for(i=len-1;i>0;i--)
 {
  if(a[i]>a[i-1])
   k=k-a[i-1];
  else if(a[i]==a[i-1] || a[i]<a[i-1])
   k=k+a[i-1];
 }
 printf("\nIts Decimal Equivalent is:");
 printf("%d",k);
 getch();
}
Read more Similar C Programs
Learn C Programming

Number System

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it


(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!


List of C Programs