# Decimal to roman numeral converter in node js

Js program for Decimal to roman numeral converter. Here more solutions.

``````//  Node Js program for
//  Conversion from Decimal to roman number
class Perform
{
// Display roman value of n
show(n)
{
switch (n) {
// Test Cases
case 1:
this.ans += "I";
break;
case 4:
this.ans += "IV";
break;
case 5:
this.ans += "V";
break;
case 9:
this.ans += "IX";
break;
case 10:
this.ans += "X";
break;
case 40:
this.ans += "XL";
break;
case 50:
this.ans += "L";
break;
case 90:
this.ans += "XC";
break;
case 100:
this.ans += "C";
break;
case 400:
this.ans += "CD";
break;
case 500:
this.ans += "D";
break;
case 900:
this.ans += "DM";
break;
case 1000:
this.ans += "M";
break;
}
}
select(number, collection, size)
{
var n = 1;
var i = 0;
for (
i = 0; i < size; ++i)
{
if (number >= collection[i])
{
n = collection[i];
}
else
{
break;
}
}
this.show(n);
// Reduce the value of number
return number - n;
}
roman(number)
{
if (number <= 0)
{
// When is not a natural number
return;
}
this.ans = "";
var num = number;
// Base case collection
var collection = [1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900, 1000];
// Get the size of collection
var size = collection.length;

while (number > 0)
{
number = this.select(number, collection, size);
}
console.log(" " + num + " : " +this.ans);
}
}
function main()
{
// Test Case
}
// Start program execution
main();``````

Output

`````` 10 : X
18 : XVIII
189 : CLXXXIX
604 : DCIV
982 : DMLXXXII
3000 : MMM``````

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