Analysis of the meaning and usage of += operator in C language

= operator is used to add the value of the left operand to the value of the right operand and assign the result to the left operand. It is suitable for numeric types and the left operand must be writable.

The meaning and usage of = operator in C language

Meaning

The = operator is a compound assignment operator, which means adding the value of the left operand to the value of the right operand, and then assigning the result to the left operand.

Syntax

variable += expression;

Where:

• variable is the left operand, which must be a writable variable .
• expression is the right operand, which can be a constant, variable or expression.

Practical case

The following example increases the value of variable x by 5:

int x = 10;
x += 5; // 等价于 x = x + 5;

After the operation, ## The value of #x becomes 15.

Note

= operator only applies to numeric types.
• The left operand must be writable.
• The right operand cannot be the left operand itself.

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