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);
    }
    // Add new line
    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