C++ Primer Plus

The Logical AND Operator: &&

The logical AND operator, written &&, also combines two expressions into one. The resulting expression has the value true only if both of the original expressions are true. Here are some examples:

5 == 5 && 4 == 4   // true because both expressions are true5 == 3 && 4 == 4   // false because first expression is false5 > 3 && 5 > 10    // false because second expression is false5 > 8 && 5 < 10    // false because first expression is false5 < 8 && 5 > 2     // true because both expressions are true5 > 8 && 5 < 2     // false because both expressions are false

Because the && has a lower precedence than the relational operators, you don’t need to use parentheses in these expressions. Like the || operator, the && operator ...