The difference between a++ and ++a in c language

The difference between a and a in C language lies in the order of execution: a is used first and then increments, a is first incremented and then used.

The difference between a and a in C language

In C language, a and a are both postfix operators, used to increment the variable a. However, there are subtle differences in their execution order.

a

• a The expression uses the current value of a before incrementing it 1.
• is equivalent to a = a 1;

## a

• a The expression increases the value of a by 1 before being used on it.
Equivalent to
• a = 1;

Difference

• Execution order: a Use it first, then increment it; a Use it first, then use it.
• Returned value: a Returns the old value before the auto-increment operation; a Returns the new value after the auto-increment operation.

Example

<code class="c">int main() {
    int a = 5;

    a++; // a = 5, a 变成 6
    ++a; // a = 6, a 变成 7

    return 0;
}</code>

Note:

These two operators can only be used Modified lvalue (that is, a variable that can be assigned a value).
• In most cases,
• a and a are used interchangeably. However, in special cases, the order of execution may be critical.

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