How to output fraction instead of decimal number?

Question

In C++, When I calculate 2/3, it will output decimal values, how can I just get the original format (i.e.g 2/3) instead of 0.66666667

Thanks

Answer 1

This is impossible in general: floating point numbers are not precise and do not retain sufficient information to fully reconstruct a fraction.

You could, however, write a function that heuristically finds an "optimal" approximation, whereby fractions with small numerators and denominators are preferred, as are fractions that have almost the same value as the floating point number.

If you're in full control of the code, Oli's idea is better: don't throw away the information in the first place.