AP Computer Science - Formatting Quiz

True/False (5 each):
____ 1. The printf method can be used to display a formatted output using format specifiers.
____ 2. System.out.printf(“%.2f” + 25.444); will print 25.44
____ 3. System.out.printf(“%.2f”, 25.444); will print 25.44
____ 4. System.out.printf(“%4d”, 30); will print 2 blank spaces before the number 30.
____ 5. You can use formatting with System.out.println(“”) statements.
____ 6. System.out.printf(“%2f%10s”, 2.2, “Hello”); will display: 2.20 Hello
____ 7. System.out.printf(“%.3f”, 25.5); will display 25.500
____ 8. If you want a number formatted in scientific notation you use %s.
____ 9. System.out.printf(“format”, item1, item2, … , itemN); will format N items.
____ 10. Strings can be inserted into the formatting method by concatenating with +’s.

Short Answer:

1. (10 points) Write a System.out.printf statement for the double a = 24.55555 and a string s = “Start” to display: (3 spaces)24.6 Start

2. (40 pts) Reference: Java Programming Textbook
   
   

   

Solutions

(1) True
(2) False; can't use the +, need a comma.
(3) True
(4) True
(5) False
(6) False; it will print 2.200000.
(7) True
(8) False; use %e.
(9) True
(10) False

(1) System.out.printf("%5.1f%6s", a, s);
(2)

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