Equality operators: == and !=

Syntax

expression == expression
expression != expression

Remarks

The equal-to operator (==) returns true if both operands have the same value; otherwise false.
The not-equal-to operator (!=) returns true if the operands don't have the same value; otherwise false.

In C and C++, not_eq can be used as alternative to !=. For more information, see not-eq.

Example

#include <iostream>

int main()
{
    int x = 1, y = 1, z = 2;
    
    if (x == y)
    {
        std::cout << "Equal\n";
    }
    
    if (x != z)
    {
        std::cout << "Not equal\n";
    }
}

Equal
Not equal

See also

not-eq
Operator overloading
Expressions with binary operators
C++ built-in operators, precedence; and associativity
C relational and equality operators