What does == mean in c++

The == operator in C is used to compare whether the values ​​of the operands are equal and return a Boolean value. true means equal and false means not equal. It can compare data of different types, but only compares values ​​and not types. For custom objects, you need to overload the == operator. In addition, C provides other comparison operators, including !=, <, >, <=, >= for comparing operands of different types.

The meaning of == in C

The == operator in C is a comparison operator used to Compares the values ​​of two operands for equality. It returns a Boolean value that is true for equality and false for inequality.

Specific usage

== operator can compare various data types, including basic data types (such as int, float), strings and custom objects. For example:

<code class="cpp">int a = 10;
float b = 10.0f;
std::string c = "Hello";

bool result1 = (a == 10); // true
bool result2 = (b == 10.0f); // true
bool result3 = (c == "Hello"); // true</code>

Notes

• == The operator only compares the values ​​of the operands, not the types. For example:

<code class="cpp">int a = 10;
float b = 10.0f;

bool result = (a == b); // true</code>

• For custom objects, you need to overload the == operator to specify how to compare the values ​​of the objects.

Comparison with other comparison operators

In addition to ==, C also provides other comparison operators:

• !=: Not equal to

• : Greater than

• <: Less than

• =: Greater than or equal to

• <=: less than or equal to

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