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ANSWERS C Sc 227 Practice Test , Friday 26-Sep-2008
1. Write a checkmark to the right of any assertion if it would pass. Leave the line in the comment blank
assertEquals(2, j / k); // a. ______
assertEquals(1, j % k); // b. ______
assertEquals(-0.5, x + 1, 1e-12); // c. ______
assertEquals('U', s.charAt(1)); // d. ______
assertEquals(5, s.indexOf("Arizona")); // e. ______
assertEquals(0, s.indexOf("U of A")); // f. ______
assertTrue(s.compareTo("ASU") > 0); // g. ______
assertEquals(2.0, Math.sqrt(j), 1e-12); // h. ______
2a. Complete the unit test for method grade (fill in the blanks) so it executes every branch of code in the
assertEquals( "A", grade(90.0) ); // or some argument > 90.
assertEquals( "B", grade(80.0) ); // or some argument > 80.0 and < 90.0
assertEquals( "C", grade(70.0) );
assertEquals( "D", grade(60.0) );
assertEquals( "E", grade(50.0) );
2b.
public String grade(double percentage) {
String result;
if (percentage >= 90.0)
result = "A";
else if (percentage >= 80.0)
result = "B";
else if (percentage >= 70.0)
result = "C";
else if (percentage >= 60.0)
result = "D";
else
result = "E";
return result;
}
3. How many times will the following code print "Hello"? 0, Unknown, and Infinite are legitimate
int j = 1;
int n = 5;
while(j <= n) {
System.out.print("Hello");
n++;
} Infinite
int j = 1;
while(j <= 11) {
System.out.print("Hello");
j = j + 3;
} 4
int n = 0;
for(int j = 1; j < n; j++) {
System.out.print("Hello");
} Zero
// Tricky Question
for(int j = 1; j <= 11; j++);
System.out.print("Hello"); 1
4. Write a for loop that prints this sequence of integers: -10 –5 0 5 10 15, … , 5555
for (int j = -10; j <= 5555; j = j + 5)
System.out.print (j + " ");
