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Thread: Difference between ++i and i++

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    Default Difference between ++i and i++

    Hi,

    I'm new to Java and I wanted to understand what is the difference between ++i and i++? I know at times they function the same way and at times they function differently.

    1) What are those cases? Like if i say:

    int i = 5;
    int x = i++;
    vs

    int i = 5;
    int x = ++i

    2)What about cases when it is not just the assignment to a variable. In cases where you're using it immediately?

    int i = 5;
    int j = 7;
    int x = i++ * --j;
    or
    int i = 5;
    int j = 7;
    int x = ++i * j++;

    What is the difference?

    Thanks!


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    Default Re: Difference between ++i and i++

    Postfix and prefix are the search terms: https://www.google.com/search?q=java+postfix+vs+prefix

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    Default Re: Difference between ++i and i++

    When you do a prefix like ++i the value of i is increment before returning and if you do a postfix like i++ then value is incremented after returning.

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    Default Re: Difference between ++i and i++

    Like if u do a=++i then first i will save its value to a then only add 1 to itself. whereas a=i++ means first i adds 1 to itself then only save the value to a.

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    Default Re: Difference between ++i and i++

    Quote Originally Posted by viper_pranish View Post
    Like if u do a=++i then first i will save its value to a then only add 1 to itself. whereas a=i++ means first i adds 1 to itself then only save the value to a.
    Did you verify your understanding with code?

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