and or not in java, python 3, c++ and javascript

 In Java, you can use the && operator for "and", || for "or", and ! for "not" in an if statement with an else if clause and an else clause as follows:

if (x > 0 && y > 0) { 
    System.out.println("x and y are both positive");
} else if (x > 0 || y > 0) { 
    System.out.println("x is positive or y is positive (or both), but not both"); 
} else { 
    System.out.println("x and y are not positive"); 
}

In Python 3, you can use the and operator for "and", or for "or", and not for "not" in an if statement with an elif clause and an else clause as follows:

if x > 0 and y > 0: 
    print('x and y are both positive') 
elif x > 0 or y > 0: 
    print('x is positive or y is positive (or both), but not both')
else: 
    print('x and y are not positive')

In C++, you can use the && operator for "and", || for "or", and ! for "not" in an if statement with an else if clause and an else clause as follows:

if (x > 0 && y > 0) { 
    std::cout << "x and y are both positive" << std::endl; 
} else if (x > 0 || y > 0) { 
    std::cout << "x is positive or y is positive (or both), but not both" << std::endl; 
} else { 
    std::cout << "x and y are not positive" << std::endl; 
}

In JavaScript, you can use the && operator for "and", || for "or", and ! for "not" in an if statement with an else if clause and an else clause as follows:

if (x > 0 && y > 0) { 
    console.log('x and y are both positive'); 
} else if (x > 0 || y > 0) { 
    console.log('x is positive or y is positive (or both), but not both'); 
} else { 
    console.log('x and y are not positive'); 
}

Note that the xor operator (exclusive or) is not a standard operator in Java, Python 3, C++, or JavaScript. To perform an exclusive or operation, you can use the ^ operator in all of these languages, and then negate the result if you want a "not xor" operation.