Program 97:Convert Roman to Decimal

Program 97:

#include<stdio.h> 
#include<string.h> 
#include<stdlib.h> 
int main() 
{ 
int a[100],len,i,j,k; 
char rom[100];
printf("Enter the Roman Numeral:\n"); 
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"); 
     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("Its Decimal Equivalent is:"); 
     printf("%d\n",k); 
     return 0;
 }

Explanation:

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Output: