That's a huge stretch. Integer arithmetic is perfectly portable. Defined operations have bit-exact defined results, reproducible on any platform.

In contrast, the result of basic floating point operations is not. You may live in a world were you use a single cpu type, and a single OS, and a single compiler, in which case, it might appear to you as defined. But anyone involved in some portability across multiple systems know how improbable it is to rely on floating point for anything exact. Actually, don't. ever.

For anything which requires exact results, use integer instead.