Is there a reverse to Modulus in C

Question

It's been over thirty years since my high-school algebra so pardon my ignorance due to senility. Is there a inverse to modulus in C language. Such that one could solve the reverse of a previous statement called.

Quite simply :

x = y % 128

How do I solve for y, using C code, if x is known.

Any help would be greatly appreciated.

I’m voting to close this question because this is fundamentally a math question, not a programming question. — Karl Knechtel, Sep 05 '20 at 23:12
It's a semantic not logic question granted but a programming question none the less. — Whales, Sep 05 '20 at 23:19
"Is there a inverse to modulus in C language." --> C lacks a proper modulus for `int`, let alone an inverse one. See [What's the difference between “mod” and “remainder”?](https://stackoverflow.com/q/13683563/2410359). — chux - Reinstate Monica, Sep 06 '20 at 09:05
@Karl Knechtel I voting to re-open as there are important differences and limitations between the mathematical Modulus and C's remainder operator `%`. — chux - Reinstate Monica, Sep 06 '20 at 09:09

score 2 · Answer 1 · answered Sep 05 '20 at 23:08

2

Mathematically, y can be solved in such format

x + 128*k

where k is any integer

answered Sep 05 '20 at 23:08

ThomasIsCoding

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ok thanks for the input I see the dilema with modulus. – Whales Sep 05 '20 at 23:20
1

In C, `%` is the _remainder, not _modulus_. No difference when `y` and 128 are positive. `x + 128*k` work OK when `x,k >= 0`, but falls apart otherwise. – chux - Reinstate Monica Sep 06 '20 at 09:02

Is there a reverse to Modulus in C

1 Answers1