What does a-=b mean in c++

In C, a-=b is equivalent to a = a - b. Subtract b from the current value of a and then reassign it to a. The advantage is that it is simple and suitable for integer types.

The meaning of a-=b in C

In C, a-=b is equivalent to a = a - b, which is a compound assignment operator. It subtracts the value of b from the current value of variable a and reassigns the result to a.

Usage Example

The following is an example using a-=b:

<code class="cpp">int a = 10;
int b = 5;

a -= b; // 等价于 a = a - b</code>

After executing this code, the variable# The value of ##a becomes 5.

Advantages

The main advantage of a-=b is simplicity. It allows you to perform two operations (subtraction and assignment) using fewer lines of code. This improves code readability and simplicity.

Note

• a-=b The operator only applies to integer types, not floating point types.
If
• a and b are both pointer types, this operator will subtract the address pointed to by b from the address pointed to by a Number of bytes between addresses.

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