Modulo with a negative integer in C++ [duplicate]

Question

Why does -26 % 10 output -6 in C++ ?

How to get the standard modulo, that would output 4 ?

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Note: this question is probably a duplicate of this one, or many others, but I haven't found one formulated in a short way, understandable in an eye blink. And as I personnaly like finding short questions / short answers (for simple issues), I thought it may interest other people. I'll delete this notice later.

Answer 1

One needs to do

(-26 % 10 + 10) % 10

to get 4.

For future reference :

int mod(int a, int b) { return (a % b + b) % b; }