What does minus equal mean in c language

The minus-equal (-=) operator in C subtracts a value from a variable and stores it back into the variable. The usage method is: variable -= expression;. Common scenarios include decrementing variables, subtracting values ​​from accumulators, and adjusting counters.

The meaning of minus equal to (-=) in C language

Minus equal to (-=) is a compound Assignment operator, which subtracts a value from a variable and stores it back into the variable.

Operation syntax

<code class="c">变量 -= 表达式;</code>

Example

<code class="c">int x = 10;
x -= 5; // 等价于 x = x - 5;</code>

After performing this operation, the value of x becomes 5.

Usage scenarios

The minus and equal operator is usually used to update variable values, for example:

• Decrease a variable: x -= 1; Equivalent to x = x - 1;
• Subtract a value from an accumulator variable: total -= amount;
• Adjust a counter variable: counter -= 2;

Notes

The minus and equal operator is An assignment operator that changes the value of its left operand. Therefore, make sure the variable is properly initialized before using it.

The above is the detailed content of What does minus equal mean in c language. For more information, please follow other related articles on the PHP Chinese website!