CS 131 Chapter 4 Exercises

1.

age < 21

age << " is under 21.";

2. Since the two conditions are mutually exclusive, you can use an if/else.

if (age >=65)
  cout << "You may retire.";
else
  cout << "Keep working.";

3. The semicolon after the first line stops the "if" statement and the "else" will cause an error.


5.


Maybe

YES

7.
a. no
b. leap
c. no
d. no

8.
(age <16) && (height > 76)

if (!(age <16) && (height > 76))
...

9.
unoSorry. I'm just starting Spanish.

duoSorry. I'm just starting Spanish.

tres

Sorry. I'm just starting Spanish.

Corrections: 

if (num==1)
  cout << "uno";
else if (num==1)
  cout << "uno";
else if (num==1)
  cout << "uno";
else "Sorry. I'm just starting Spanish."


10. 
a. THe one on the left compiles.

bi. 
Pay= $300

bii 
Bouns --
Pay = $ 550


14.
if (age >=18)
{
   cout << "Adult ";
   if (sex =='F')
	   cout << "female";
   else
       cout << "male.";
}
else
{
   cout << "Juvenile ";
   if (sex =='F')
	   cout << "female";
   else
       cout << "male.";
}17.

   int age;
   cout << "Enter your age: ";
   cin >> age;
    if ((13 <= age) && (age < 20))
	cout << "teenager\n";
   else 
	cout << "not a teenager\n";


19.
   cout << "Smallest: ";
   if (exam1 > exam2) 
      if (exam2 > exam3)
	 cout << exam3;
      else cout << exam2;
   else
      if (exam1 >> exam3)
	  cout << exam2;
      else cout << exam1;

   cout << "\nLargest: ";
   if (exam1 > exam2) 
     if (exam1 > exam3)
        cout << exam1;
     else cout << exam3;
   else
     if (exam2 > exam3)
        cout << exam2;
     else cout << exam3