The difference between __c and modulo in C language

The difference between the remainder in C and the modulus of taking

Have not noticed this problem before, check a bit today, feel too cumbersome, now simple and clear summary

For integer number A,b, the method of modulo operation or remainder operation is:

1. Find the integer quotient: c = A/b;

2. Computational model or remainder: R = a-c*b.

The modulus operation and the remainder operation are different in the first step: the remainder operation is rounded in the 0 direction when the value of C is taken, while the modulo operation rounds in the negative infinity direction when calculating the value of C.

The so-called round to the 0 direction, that is, the decimal point as the boundary, the decimal part directly removed. such as (INT) -1.324=-1 (also called truncation method);

Rounding in the negative infinity direction means that the end result is smaller than the real value. such as (int) -1.324=-2; (int here is cast data type)

Note that C refers to the business;