c - Converting a number to string with multiple arguments -

i want convert number x of base n string , store in str. str has max size of max. in program don't want use library functions. if reach maximum size of array, function should return false , array contents should undefined.

the prototype of function looks this:

bool num2str(int x, char *str, unsigned n, unsigned max); 

how go making work? i'm having trouble understanding algorithm behind it.

i need check value of n, did that:

bool num2str(int x, char *str, unsigned n, unsigned max) {     assert(n >= 2 && n <= 36);     return true; } 

but that's do. please help.

let's take number in base 10: 123456. let's repeatedly apply module , integer division using number , base 10:

123456 mod 10 = 6 123456 div 10 = 12345  12345 mod 10 = 5 12345 div 10 = 1234 

as can see, module base extracts last digit, while integer division base shifts number on digit right. can same base. hope hint enough.