Convert Roman Numeral to Decimal


/* Write a C program to convert a Roman numeral to its decimal equivalent. */
#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();
}

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