What's the difference between “mod” and “remainder”?

Question

My friend said that there are differences between \"mod\" and \"remainder\".

If so, what are those differences in C and C++? Does \'%\' mean either \"mod\" or \"rem\

Answer 1

In mathematics the result of the modulo operation is the remainder of the Euclidean division. However, other conventions are possible. Computers and calculators have various ways of storing and representing numbers; thus their definition of the modulo operation depends on the programming language and/or the underlying hardware.

 7 modulo  3 -->  1  
 7 modulo -3 --> -2 
-7 modulo  3 -->  2  
-7 modulo -3 --> -1