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PROGRAMMING FOR PROBLEM SOLVING LAB : Program 14

Write a C program to convert a Roman numeral ranging from I to L to its decimal equivalent. 

#include <stdio.h> 

#include <conio.h> 

#include <string.h> 

#include <stdlib.h> 

void main()

{

char rom[30];

int a[30], l, i, k, dec; 

clrscr();

printf("Enter the roman number\n"); 

scanf("%s", &rom);

l =strlen(rom); 

for(i = 0; i < l; i++)

{

switch (rom[i])

{

case 'I': a[i] = 1; 

break;

 case 'V': a[i] = 5; 

 break;

case 'X': a[i] = 10; 

break;

case 'L': a[i] = 50; 

break;

case 'C': a[i] = 100; 

break;

case 'D': dec = dec + 500; 

break;

case 'M': a[i] = 1000; 

break;

default : printf("Invalid choice"); 

break;

}

}

k = a[l - 1];

for(i = l - 1; i > 0; i--)

{

if(a[i] > a[i - 1])

{

k = k - a[i - 1];

}

if(a[i] <= a[i - 1])

{

k = k + a[i - 1];

}

}

printf("decimal equivalent is %d", k); 

getch();

}



OUTPUT:

Enter the roman number
XV
decimal equivalent is 15

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