The difference between i++ and ++i in c++

The difference between i and i in C lies in the order of reading and incrementing the variable value: i: read the original value of i first, and then increment its value. i: First increment the value of i, and then read the incremented value.

The difference between i and i in C

In the C programming language, i and i are both suffix increments Operator used to increase the value of variable i by 1. However, there is a subtle but important difference between the two:

i :

• first performs a value read operation on i and then increments it value.
• Therefore, the value of the i expression is the original value of i, not the incremented value.

i:

• First increment the value of i, and then read the incremented value.
• Therefore, the value of the i expression is the incremented value of i.

Example:

<code class="cpp">int i = 5;
int j = i++; // j = 5, i = 6
int k = ++i; // k = 7, i = 7</code>

In the above example, j increments the value of i from 5 to 6, but the expression j itself still has the value 5. On the other hand, i increments the value of i from 6 to 7, and the expression itself also has the value 7.

Usage scenarios:

• i: Use when you need to get the original value of a variable, such as in a loop counter.
• i: Use when you need to get the incremented value of a variable, such as in incremental assignment.

To summarize, i and i are both postfix increment operators, but they differ in the order in which they read and increment variable values.

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