The meaning of i plus plus and plus plus i in java

i and i have different meanings in Java: i (post-increment) will increment i after the expression is completed. i (prefix increment) will increment i before the expression is executed.

The meaning of i and i in Java

The Java programming language provides two increment operators: i and i . Although they both increase the value of variable i, they work in slightly different ways.

i (post-increment)

i operator increments variable i by 1, but it does so after the expression is evaluated. Therefore, when an expression contains i, the value of i remains unchanged until the expression is evaluated.

For example:

<code class="java">int i = 10;
int result = i++ + 1;</code>

In the above example, the value of result is 11 because i increases the value of i (10 -> 11), but until The expression is incremented after the result has been evaluated.

i (prefix increment)

The i operator is like i , but it increments the variable i by 1 before the expression is evaluated. Therefore, when an expression contains i, the value of i is incremented before the expression is evaluated.

For example:

<code class="java">int i = 10;
int result = ++i + 1;</code>

In the above example, the value of result is 12 because i is incremented before the expression is evaluated (10 -> ; 11), then i increases the value of i again (11 -> 12).

Choose which operator to use

In most cases, i and i can be used interchangeably. However, in some specific cases, using specific operators may be more appropriate. For example, if you want the value of i to be updated after the expression is executed, you should use i (post-increment). If you want the value of i to be updated before the expression is executed, you should use i (prefix increment).

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