Float with fixed amount of digits after colon

ffixed.h

#ifndef FFIXED_H
#define FFIXED_H

#endif // FFIXED_H

namespace number {
    struct ffixed {

        friend ffixed operator-(const ffixed &This, const ffixed &other);

        friend ffixed operator+(const ffixed &This, const ffixed &other);

        friend ffixed operator*(const ffixed &This, const ffixed &other);

        friend ffixed operator/(const ffixed &This, const ffixed &other);

        ffixed &operator=(const ffixed &r);

        ffixed &operator=(double d);

        ffixed() {}

        ffixed(double d);

        operator double() const;

    private:
        int nominator;
        enum {
            denominator = 1 << 10
        };
    };

}

float_fixed.c

#include <stdlib.h>
#include <stdio.h>
#include <iostream>

#include "ffixed.h"

namespace number {

    ffixed &ffixed::operator=(double d) {
        this->nominator = d / this->denominator;
        return *this;
    }

    ffixed &ffixed::operator=(const ffixed &r) {
        this->nominator = r.nominator;
        return *this;
    }

    ffixed::ffixed(double d) {
        this->nominator = d * this->denominator;
    }

    ffixed::operator double() const {
        return (double) this->nominator / this->denominator;
    }

    ffixed operator+(const ffixed &This, const ffixed &other) {
        ffixed res;
        res.nominator = This.nominator + other.nominator;
        return res;
    }

    ffixed operator-(const ffixed &This, const ffixed &other) {
        ffixed res;
        res.nominator = This.nominator - other.nominator;
        return res;
    }

    ffixed operator*(const ffixed &This, const ffixed &other) {
        ffixed res;
        res.nominator = (int) This.nominator * other.nominator / ffixed::denominator;
        return res;
    }

    ffixed operator/(const ffixed &This, const ffixed &other) {
        ffixed res;
        res.nominator = This.nominator * ffixed::denominator / other.nominator;
        return res;
    }
}

namespace c {

    extern "C" void init() {
        number::ffixed a = 0.14, b = 0.33;

        ::printf("ADD: %f\n", (double) (a + b));
        ::printf("SUB: %f\n", (double) (a - b));
        ::printf("MUL: %f\n", (double) (a * b));
        ::printf("DIV: %f\n", (double) (a / b));
    }

}

int main() {

    c::init();

    return 0;
}