What does % mean in Java?

In Java, "%" means remainder. It is a binary operator. The syntax is "operand 1 % operand 2". The return value is the remainder of the division operation. The operand of "%" is usually a positive integer, but it can also be a negative number, or even a floating point number; if a negative number is involved in this operation, the result depends on whether the previous number is positive or negative.

The operating environment of this tutorial: windows7 system, java8 version, DELL G3 computer.

% in Java means taking remainder.

The remainder operator is %, which is a binary operator. Its operand is usually a positive integer or a negative number or even a floating point number. If a negative number participates in this operation, the result will be positive or negative. Whether the previous number is positive or negative.

For integers, Java’s remainder operation rules are as follows

a%b=a-(a/b)*b 
5%3=5-(5/3)*3=2 
5%-3=5-(5/-3)*-3=2 
-5%3=-5-(-5/3)*3=-2 
-5%-3=-5-(-5/-3)*-3=-2

If there are floating point numbers in the operand, the rule used is

a%b=a- (b*q), hereq=int(a/b)

5.2%3.1=5.2-1*3.1=2.1 
5.2%-3.1=5.2-(-1)*(-3.1)=2.1 
-5.2%3.1=-5.1-(-1)*3.1=-2.1 
-5.2%-3.1=-5.1-(-1)*(-3.1)=-2.1

Extended knowledge:

java basic knowledge Operator about %: Any integer modulo 2 is either 0 or 1. How to understand?

An arbitrary number, divided by 10, the remainder is 0~9.

An arbitrary number, divided by N, the remainder is 0~N-1.

An arbitrary number, divided by 2, the remainder is 0~1.

And M % N means what is the remainder after dividing M by N?

So the result of M % 2 must be 0 or 1.

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