Q.What is the use of logical operator?

Relational and logical operators are used to test conditions, and their result is always either true (1) or false (0). Together they let a program make decisions.

Relational operators compare two operands:

• < less than, > greater than, <= less than or equal, >= greater than or equal, == equal to, and != not equal to.

A crucial distinction is between = and ==: the single = is the assignment operator (it stores a value in a variable), while the double == is the relational equality operator (it tests whether two values are equal). Confusing the two is a classic beginner mistake.

Logical operators combine or invert conditions:

• && logical AND - true only if both conditions are true.
• || logical OR - true if at least one condition is true.
• ! logical NOT - reverses a condition (true becomes false). …