The difference between equal and equal in c language

In C language, "equal" (=) is used for assignment, and "equal" (==) is used for comparison. Equal (=) operator: Assigns the value on the right side to the variable on the left. Equality (==) operator: Compares two values ​​for equality and returns a Boolean value (true/false). Notes on usage: "Equal" must be used for assignment and "Equal" must be used for comparison, otherwise an error will occur.

The difference between "equal to" and "equal to equal" in C language

In C language, "equal to "(=) and "equal to" (==) are two different operators with different meanings and usage.

Equal (=) operator

The equal operator assigns a value to a variable. The value on the right side of the operator is copied to the variable on the left side of the operator. For example:

<code class="c">int x;
x = 5;</code>

In this code, the equals operator assigns the value 5 to the variable x, so the value of x is now 5.

Equal to equal (==) operator

The equal to or equal to operator is used to compare whether two values ​​are equal. It returns a Boolean value (0 for false, non-0 for true) indicating whether the two values ​​are equal. For example:

<code class="c">if (x == 5) {
  // x 为 5，执行此代码块
} else {
  // x 不为 5，执行此代码块
}</code>

In this code, the equals operator compares whether the variable x is equal to 5. If they are equal, the if statement block is executed; if they are not equal, the else statement block is executed.

DIFFERENCE

The main difference between the equals and equals operators is their purpose:

• Equals (= ) operator is used for assignment.
• Equal equals (==) operator is used for comparison.

Usage Notes

• When assigning values, you must use the equal operator (=), but not the equal operator (== ).
• When comparing values, you must use the equals operator (==), but not the equals operator (=).
• Otherwise, errors or unexpected behavior may result.

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