C Programming - convert number to any base

Just to continue with my programming practice I decided to write a function which takes a number and a base and converts that number to that base.

Here's the function:

//takes a number and a base to work to. It converts (just prints) this number to said base

//base has to be greater then 1

void printInBase(int number, int base) {

    

    assert(base > 1);

    

//find out how many units is needed to make the number

//int numberOfUnits = 1;

int units = base;

while (units <= number) {

//numberOfUnits ++;

units = units * base;

}

    //make an array which will be printed out in the end

    //int numberArray [numberOfUnits];

//work out which how many of each unit

    //int i = 0;

    

int result = number;

while (units > 1) {

units = units / base;

printf("%d", result / units);

result = result % units;

        //i++;

}

 

//prints out array

    //for (int c = 0; c <= numberOfUnits ; c++) {

    //    printf("%d", numberArray[c]);

    //}

}

 Output:

Type a starting number: 1

Type an end number: 30

Type a base to count in: 7

1 = 1

2 = 2

3 = 3

4 = 4

5 = 5

6 = 6

7 = 10

8 = 11

9 = 12

10 = 13

11 = 14

12 = 15

13 = 16

14 = 20

15 = 21

16 = 22

17 = 23

18 = 24

19 = 25

20 = 26

21 = 30

22 = 31

23 = 32

24 = 33

25 = 34

26 = 35

27 = 36

28 = 40

29 = 41

30 = 42

The function fails at counting base 1, but it hurts my brain too much to think about it! Also, to count in a base larger then 10, it's best to put a comma between digits. e.g:

Type a starting number: 1

Type an end number: 30

Type a base to count in: 15

1 = 1,

2 = 2,

3 = 3,

4 = 4,

5 = 5,

6 = 6,

7 = 7,

8 = 8,

9 = 9,

10 = 10,

11 = 11,

12 = 12,

13 = 13,

14 = 14,

15 = 1,0,

16 = 1,1,

17 = 1,2,

18 = 1,3,

19 = 1,4,

20 = 1,5,

21 = 1,6,

22 = 1,7,

23 = 1,8,

24 = 1,9,

25 = 1,10,

26 = 1,11,

27 = 1,12,

28 = 1,13,

29 = 1,14,

30 = 2,0,

This way you can distinguish between the 10's and 20's etc. Might be worth putting this in the function. But also, I could make it convert to hexadecimal? Might require more brain hurt.