What does == mean in c++

In C, the == operator represents an equality comparison: it is used to compare the values ​​​​of two operands and returns a Boolean value. If the operands are equal, it is true, if they are not equal, it is false. It can be used to compare different types. Operands, including primitive types, objects, pointers, and references compare the values ​​of the operands, not their identities

In C = Meaning of =

In the C programming language, == is an equality comparison operator. It is used to compare the values ​​of two operands and returns a Boolean value:

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

== Operator can be used to compare operands of different types, including:

• Basic types (such as int, float, double)
• Class and structure objects
• Pointers
• References

Here are some examples of using the == operator:

<code class="cpp">int a = 10;
int b = 20;

bool result = (a == b); // 返回 false，因为 a 和 b 不相等</code>

<code class="cpp">struct Point {
    int x;
    int y;
};

Point p1 = {1, 2};
Point p2 = {1, 2};

bool result = (p1 == p2); // 返回 true，因为 p1 和 p2 的 x 和 y 成员相等</code>

<code class="cpp">char* str1 = "Hello";
char* str2 = "Hello";

bool result = (str1 == str2); // 返回 true，因为 str1 和 str2 指向相同的字符串常量</code>

Note Things to note:

• == operators compare the values ​​of their operands, not their identities.
• If you want to compare the identities of two objects (whether they point to the same memory location), use the == operator.

The above is the detailed content of What does == mean in c++. For more information, please follow other related articles on the PHP Chinese website!