How to convert integer to char without C library?

Question

In a c programming exercise I am asked to convert an int to char without using the C library.

Any idea how to go about it?

edit: what I mean by int is the built

Answer 1

If you really want a string:

#include 

char *tochar(int i, char *p)
{
    if (i / 10 == 0) {
        // No more digits.
        *p++ = i + '0';
        *p = '\0';
        return p;
    }

    p = tochar(i / 10, p);
    *p++ = i % 10 + '0';
    *p = '\0';
    return p;
}

int main()
{
    int i = 123456;
    char buffer[100];
    tochar(i, buffer);
    printf("i = %s\n", buffer);
}