How to find remainder in golang

Golang is an open source programming language ideal for building applications that are reliable, efficient, secure, and easy to maintain. This article will provide an in-depth introduction to the principles and usage of remainder (modulo) operations in Golang.

1. The definition and principle of the remainder operation

In mathematics, the remainder operation refers to finding the remainder after dividing a non-negative integer by another positive integer. The remainder operator in Golang is "%", which returns the remainder of the division of two numbers. For example, the expression "5 % 2" will return "1" because the remainder of 5 divided by 2 is 1.

In Golang, the remainder operation works by dividing the dividend by the divisor to obtain the quotient and remainder, and the returned result is the remainder. If the dividend is less than the divisor, the remainder operation returns the value of the dividend. If the divisor is 0, Golang will throw a runtime panic (error).

2. The purpose of remainder operation

The remainder operation has many uses in programming. Here are a few of them:

(1) Judgment Parity

When a number is divided by 2 and the remainder is 0, it is an even number; when the remainder is 1, it is an odd number. Therefore, the parity of a number can be determined through the remainder operation.

(2) Calculate periodic events

In the program that implements periodic events, the remainder operation can be used to calculate the time interval of periodic events. For example, if you want to execute an event every 100 milliseconds, you can use a counter in the program and add 100 milliseconds each time. When the counter value is greater than or equal to 1000 milliseconds, execute the event and reset the counter to zero.

(3) Implement circular queue

The circular queue is a ring-shaped data structure, usually used to store buffers of data. In a circular queue, the position pointed by the tail pointer of the queue is circular, so a remainder operation is needed to calculate the position where the new element should be inserted.

(4) Encryption algorithm

In some encryption algorithms, the remainder operation can be used to calculate the value of the hash function. For example, the built-in hash functions of Pascal and Ruby languages ​​use remainder operations.

3. Notes

When using the remainder operation, you need to pay special attention to the following issues:

(1) For negative numbers, Golang’s The results of remainder operations may be inconsistent with other languages. For example, in Python, -1 % 3 results in 2, while in Golang, -1 % 3 results in -1. Therefore, special care needs to be taken when using the remainder operation.

(2) When dealing with floating point numbers, the remainder operation may produce unexpected results. For example, the result of 1.1 % 0.1 may be inconsistent on different compilers due to precision limitations of floating point arithmetic.

(3) When using the remainder operation, you need to pay attention to avoid the situation where the divisor is 0, otherwise the program will throw a runtime error.

4. Summary

The remainder operation is widely used in programming. It is a simple and effective calculation method. In Golang, the remainder operator is "%", which can be used to implement a variety of functions, including determining parity, calculating periodic events, implementing circular queues and encryption algorithms, etc. When using the remainder operation, special attention needs to be paid to negative numbers, floating point numbers, and the case where the divisor is 0.

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