The difference between ++i and i++

WBOY
Release: 2016-07-29 08:33:17
Original
1700 people have browsed it

1. Usage of ++i (take a=++i, i=2 as an example)
First add 1 to the i value (that is, i=i+1), and then assign it to variable a (that is, a=i ),
Then the final a value is equal to 3 and the i value is equal to 3.
So a=++i is equivalent to i=i+1, a=i
2, the usage of i++ (take a=i++, i=2 as an example)
First assign the i value to the variable a (that is, a= i ), then add 1 to the i value (that is, i=i+1),
Then the final a value is equal to 2 and the i value is equal to 3.
So a=i++ is equivalent to a=i, i=i+1
3, ++i and i++
a=++i is equivalent to i++, a=i
a=i++ is equivalent to a=i, i++
4 , ++i and i++ are equivalent to i=i+1
when used alone. If assigned to a new variable, ++i first adds 1 to the i value, and i++ first assigns i to the new variable.

The above has introduced the difference between ++i and i++, including some aspects. I hope it will be helpful to friends who are interested in PHP tutorials.

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!