What do x and x- mean in C language?

Increment () and decrement (--) operators in C language: The increment operator increases the variable value by 1 and has prefix (x) and suffix (x) forms. The decrement operator decreases the value of a variable by 1 and also has prefix (--x) and suffix (x--) forms. The prefix form performs increment/decrement before using the variable, and the suffix form performs increment/decrement after using the variable.

The meaning of x and x-- in C language

In C language, x and x-- are increment and decrement operators.

Auto-increment operator (x)

The auto-increment operator will increase the value of the variable by 1. It has two forms:

• Prefix form ( x): Increments the value of a variable before using it.
• Suffix form (x ): Increase the value of a variable after it is used.

Decrement operator (x--)

The decrement operator will decrease the value of the variable by 1. It also has two forms:

• Prefix form (--x): Reduces the value of a variable before using it.
• Suffix form (x--): Reduce the value of a variable only after it is used.

Difference

The difference between the prefix form and the suffix form lies in the way variables are used:

• The prefix form goes first Auto-increment/auto-decrement, then use variables.
• The suffix form uses variables first, and then performs increment/decrement.

The following examples demonstrate the use of these operators:

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

printf("x before increment: %d\n", x);  // 5
++x;
printf("x after prefix increment: %d\n", x);  // 6
x++;
printf("x after postfix increment: %d\n", x);  // 7

int y = 10;

printf("y before decrement: %d\n", y);  // 10
--y;
printf("y after prefix decrement: %d\n", y);  // 9
y--;
printf("y after postfix decrement: %d\n", y);  // 8</code>

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