What does =- mean in C language?

The =- operator in C language is a compound assignment operator, used to subtract a specified amount from the variable value and reassign the result to the variable. The syntax is variable -= expression, which calculates the value of expression, subtracts it from the current value of the variable, and then reassigns the subtraction result to the variable. This operator makes code cleaner and more readable.

Detailed explanation of =-operator in C language

Concept:# The

##=- operator is a compound assignment operator. Its function is to subtract a specified amount from the value of the variable and reassign the result to the variable.

Syntax:

variable -= expression;

Operation:

Calculate the value of
1. expression.
Subtract the value of
2. expression from the current value of variable.
Reassign the subtraction result to
3. variable.

Example:

int x = 10;
x -= 5; // x现在等于5

Advantages:

Use

=-operator ratio Using the = and - operators alone is more concise and readable. It reduces the number of lines of code, thereby improving code maintainability.

Note:

• =-operator can only be used for numeric types (for example int, float, double).
• expression must be compatible with the type of variable.
Assignment operators have lower precedence than arithmetic operators, so parentheses need to be used carefully to ensure correct evaluation order.

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