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

In C language, the difference between the auto-increment operators a and a is: a (prefixed auto-increment): first increments the variable, and then returns the updated value. a (post-increment): Return the original value of the variable first, and then increment the variable.

The difference between a and a in C language

In C language, a and a is the increment operator, used to increment a single variable. But they have different behaviors:

a (prefixed auto-increment):

• First increment the variable a by one.
• Then assign the updated value to variable a.
• In an expression, return the updated value.

a (post-increment):

• First store the current value of variable a in a temporary register.
• Then add one to variable a.
• In an expression, returns the original value of a (that is, the value before adding one).

Example:

<code class="c">int a = 5;

int result1 = ++a; // result1 为 6，a 为 6
int result2 = a++; // result2 为 5，a 为 6</code>

Summary:

• Prefix auto-increment ( ) Increment the variable before the value is used.
• Post-increment ( ) The variable is incremented after the value is used.

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