Can you bake cookies with 9 cups of flour and 1 cup of sugar?

A good answer might be:

No. You need 4 cups of flour and 2 cups of sugar. Now you have more than enough flour, but not enough sugar, so you can't follow the recipe.

Review of Relational Operators

In order to bake cookies two things must be true:

You must have 4 or more cups of flour
You must have 2 or more cups of sugar

If one of these requirements is false, then you do not have enough ingredients. A program that follows this logic is given below. (I hope I don't need to remind you to copy it into NotePad and to play with it.)

// Cookie Ingredients Checker
//
import java.io.*;
class CookieChecker
{
  public static void main (String[] args) throws IOException
  { 
    BufferedReader stdin = 
        new BufferedReader ( new InputStreamReader( System.in ) );
 
    String inData;
    int    sugar, flour; 

    // get the number of cups of flour
    System.out.println("How much flour do you have?");
    inData   = stdin.readLine();
    flour    = Integer.parseInt( inData ); 

    // get the number of cups of sugar
    System.out.println("How much sugar do you have?");
    inData   = stdin.readLine();
    sugar    = Integer.parseInt( inData ); 

    // check that there are enough of both ingredients
    if ( flour >= 4 && sugar >= 2 )
      System.out.println("Enough for cookies!" );
    else
      System.out.println("sorry...." );

  }
}

The symbol in Java that means "and" is "&&" (ampersand ampersand). The if statement is asking a question with two parts:

if ( flour >= 4 && sugar >= 2 )
    ----------     ----------
    flour part      sugar part

Each one of these parts is a relational expression. A relational expression is a type of boolean expression that uses a relational operator to compute a true or false value. The entire expression between parentheses is also a boolean expression. It is OK (and common) for a boolean expression to be composed of smaller boolean expressions. This is just like in English where there are "compound sentences" composed of smaller sentences.

QUESTION 3:

Say that you enter 9 for flour and 1 for sugar. What value (true or false) does each of the parts give you?

               
flour >= 4  ________________

sugar >= 2  ________________

Click Here after you have answered the question