## Boolean Expressions

This chapter introduces relational and logical operators. It also discusses the use of these operators to write Boolean expressions.

### 5. AND Operator

Answer:How much flour do you have? 6
How much sugar do you have? 4
Enough for cookies!When execution gets to the if statement, it finds thatflour >= 4    is true, because 6 >= 4. Andsugar >= 2 is true, because 4 >= 2 Both sides are true, so AND gives true.

# AND Operator The and operator requires that both sides are true:

this side must be true && this side must be true

If both sides are true, the entire expression is true. If either side (or both) are false, the entire expression is false. && is a logical operator because it combines two true/false values into a single true/false value.

Here is what && does:

• true  && true  = true
• false && true  = false
• true  && false = false
• false && false = false

Use and when every requirement must be met.

Question 5:Look at the boolean expression:flour >= 4 && sugar >= 2 What will the expression give us if flour is 2 and sugar is 0?