What is the difference between = and == in C language?

In C language, = is the assignment operator, used to change the value of a variable; == is the equality comparison operator, used to compare the values ​​of two expressions and return a Boolean value.

The difference between = and == in C language

In C language, = and == are two Different operators with different functions.

= (assignment operator)

• Assigns the value of the expression to the variable on the left.
• Change the value of the variable on the left.

== (Equality comparison operator)

• Compares the values ​​of two expressions.

• Returns a Boolean value:

  • true: if the expressions are equal
  • false: if the expressions are not equal

Example:

<code class="c">int x = 10;
int y = 10;

x = y; // 将 y 的值（10）赋值给 x
int result = (x == y); // 比较 x 和 y 的值，返回 true</code>

Key Difference:

• Type: = Yes Assignment operator, while == is a comparison operator.
• Return value: = does not return any value, while == returns a Boolean value.
• Usage: = is used to set the value of a variable, while == is used to compare expressions.

So, in C language, = is used for assignment and == is used for equality comparison.

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