print float overly simple

#include <stdio.h>
#include <stdint.h>

void print_float_value(uint64_t v, size_t i, bool prev_p) {
    if(i >= 4 && v <= 0) {
        return;
    } else {
        bool p = prev_p | (v % 10 != 0);
        print_float_value(v / 10, i + 1, p);
        if(i >= 3 || p) {
            if(i == 2) {
                putchar('.');
            }
            putchar('0' + v % 10);
        }
    }
}

// Note: This does not work for doubles larger then "uint64_t max / 1000"
void print_float(double v) {
    if(v < 0) {
        putchar('-');
        v = -v;
    }
    print_float_value(v * 1000 + 0.5, 0, false);
}

int main() {
    print_float(-9.1235); putchar('\n');
    print_float(0); putchar('\n');
    print_float(5561134); putchar('\n');
    print_float(20.05); putchar('\n');
    print_float(700.0); putchar('\n');
    return 0;
}