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Code Conversion

# Decimal to roman numeral converter in c

C program for Decimal to roman numeral converter. Here mentioned other language solution.

``````// Include header file
#include <stdio.h>
#include <stdlib.h>
//  C program for
//  Conversion from Decimal to roman number

// Display roman value of n
void  result (int n)
{
switch (n)
{
// Test Cases
case 1:
printf("I");
break;
case 4:
printf("IV");
break;
case 5:
printf("V");
break;
case 9:
printf("IX");
break;
case 10:
printf("X");
break;
case 40:
printf("XL");
break;
case 50:
printf("L");
break;
case 90:
printf("XC");
break;
case 100:
printf("C");
break;
case 400:
printf("CD");
break;
case 500:
printf("D");
break;
case 900:
printf("DM");
break;
case 1000:
printf("M");
break;
}
}
long selecting(long number, int collection[], int size)
{
int n = 1;
int i = 0;
for (i = 0; i < size; i++)
{
if (number >= collection[i])
{
n = collection[i];
}
else
{
break;
}
}
result(n);
// Reduce the value of number
return number - n;
}
void  romanNo (long number)
{
if (number <= 0)
{
// When is not a natural number
return;
}
// Base case collection
int collection[] =
{1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900, 1000};
// Get the size of collection
int size = sizeof(collection)/sizeof(collection[0]);
printf(" %ld : " , number );
while(number > 0)
{
number = selecting(number, collection, size);
}
printf("\n");
}

int main()
{
// Test Case
romanNo(10);
romanNo(18);
romanNo(189);
romanNo(604);
romanNo(982);
romanNo(3000);
return 0;
}``````

Output

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

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