The difference between = and == in c++

The difference between = and == in C: = is the assignment operator, used for variable assignment; == is the equality comparison operator, used to compare whether the operands are equal.

The difference between = and == in C

In C, = and == are two different operators used for different purposes.

Equal sign =

= is the assignment operator, used to assign a value to a variable or object. It stores the value on the right side of the operator in the position to the left of the operator. For example:

<code class="cpp">int a = 10; // 将 10 赋值给变量 a</code>

equal sign==

== is the equality comparison operator, used to compare whether the values ​​of two operands are equal. . It returns a boolean value true (equal) or false (not equal). For example:

<code class="cpp">bool equal = (a == 5); // 比较 a 和 5 是否相等</code>

Key Difference The key difference between

= and == is:

• = Assign a value, == Compare two values ​​for equality.
• = always returns the value on the right, while == returns a boolean value.
• = can be used with any data type, while == can only be used with data types that have an equality operator overload.

When to use

Use = and == according to different purposes:

• When you need to assign a value to a variable or object, use =.
• When you need to compare whether two values ​​are equal, use ==.
• When you need to check whether a certain condition is true, you can use == as a conditional expression.

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