The difference between == and = in c++

In C, the == operator is used to compare expressions for equality and return a Boolean value (true or false); the = operator is used for assignment, assigning the value of an expression to a variable and returning the assigned value. variable.

The difference between == and = in C

In the C programming language, the double equal sign (== ) and single equal sign (=) operators have different meanings and uses.

== Operator

Function: Used to compare whether the values ​​​​of two expressions are equal.

Syntax:

<code class="cpp">expression1 == expression2</code>

Return value:

• If the values ​​​​of the two expressions are equal, return true .
• If the values ​​of the two expressions are not equal, return false.

Example:

<code class="cpp">int a = 5;
int b = 10;
bool result = (a == b); // result 将为 false</code>

= Operator

Function: is used for assignment .

Syntax:

<code class="cpp">variable = expression</code>

Return value:

• Assigns the value of an expression to a variable.
• Return the assigned variable.

Example:

<code class="cpp">int a;
a = 5; // a 的值现在为 5</code>

Key Difference

• == operator is used for comparison while = operator is used for assignment. The
• == operator returns a boolean value, while the = operator returns a variable to which a value has been assigned.
• == operator cannot modify the operand, while = operator can modify the operand on the left.

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