What does != mean in c++

!= operator is used to compare whether two operands are equal. Syntax: result = operand 1 != operand 2; return Boolean value: if the operands are not equal, return true; if they are equal, return false. It only works with data of the same type, e.g. comparing an integer to a string will produce an error.

!= meaning in C

!= operator

!= is a comparison operator in C, which is used to compare whether two operands are not equal.

Syntax

<code class="cpp">结果 = 操作数1 != 操作数2;</code>

Return value

!= operator returns a Boolean value:

• If the operands are not equal, return true.
• If the operands are equal, return false.

Example

<code class="cpp">int num1 = 10;
int num2 = 20;

bool result = (num1 != num2);  // 结果为 true，因为 num1 和 num2 不相等

int num3 = 10;

bool result2 = (num1 != num3);  // 结果为 false，因为 num1 和 num3 相等</code>

Note

!= operator can only compare operands of the same type. For example, integers cannot be compared to strings.

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