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Signature _____________________ Name ________________________
cs11f ____ Student ID ____________________
CSE 11
Midterm
Fall 2011
Page 1 ___________ (18 points)
Page 2 ___________ (18 points)
Page 3 ___________ (31 points)
Page 4 ___________ (13 points)
Page 5 ___________ (8 points)
Total ___________ (88 points = 84 base points + 4 points EC [5%])
(84 points = 100%)
This exam is to be taken by yourself with closed books, closed notes, no electronic devices.
You are allowed one side of an 8.5"x11" sheet of paper handwritten by you.
(Partial) Operator Precedence Table
Operators Associativity
! ++ -- (pre & post inc/dec) right to left
* / % left to right
+ - left to right
< <= > >= left to right
== != left to right
&& left to right
|| left to right
= right to left
1) What are the values of the indicated variables after the following code segments are executed?
What gets printed?
public class While { public static void main( String[] args ) { final int MAX = 9, MIN = 5; int i = 7, j = 8;
while ( i <= MAX ) { while ( j > MIN ) { ++j; System.out.println( i + " " + j ); j -= 4; } i++; j = i; }
System.out.println( i + " " + j ); } }
int x = 5, y = 3, z; boolean bool1 = !((x > 4) || (y <= 6)) == ((y <= 4) && !(x > 6));
if ( x++ >= 4 || --y >= 3 ) z = x++ + --y; else z = ++x + y--;
int a = 5, b = 3, c; boolean bool2 = !(b > 4) && (a <= 6) && (a <= 4) || (b > 6);
if ( a++ >= 4 && --b >= 3 ) c = a++ + --b; else c = ++a + b--;
bool1 =
x =
y =
z =
bool2 =
a =
b =
c =
Output
this.a = ________
Test3.b = ________
this.c = ________
c = ________
b = ________
a = ________
this.a = ________
Test3.b = ________
this.c = ________
x = ________
a = ________
b = ________ c = ________
result = ________
this.a = ________ Test3.b = ________
this.c = ________ x = ________
a = ________
b = ________ c = ________
Use the numbers below to identify various program parts.
1) static method 2) constructor
3) class definition (type) 4) instance method
5) local variable 6) static variable
7) instance variable 8) formal parameter
9) actual argument
_____ method1() on line 15 _____ b on line 18
_____ Test3() on line 11 _____ a on line 3
_____ b + c on line 27 _____ a on line 11
_____ main() on line 6 _____ ref on line 8
_____ Test3 on line 1 _____ b on line 4
3) What output is produced by the following program?
1 public class Test 2 { 3 private int a; 4 private static int b = 2; 5 private int c;
6 public static void main( String[] args ) 7 { 8 Test3 ref = new Test3( 3 );
9 ref.method1( ref.a ); 10 }
11 public Test3( int a ) 12 { 13 this.a = a; 14 }
15 public void method1( int x ) 16 { 17 int c = x--; 18 int b;
19 b = a + 2; 20 a = c + 3;
21 System.out.println( "this.a = " + this.a ); 22 System.out.println( "Test3.b = " + Test3.b ); 23 System.out.println( "this.c = " + this.c ); 24 System.out.println( "c = " + c ); 25 System.out.println( "b = " + b ); 26 System.out.println( "a = " + a ); 27 System.out.println( "result = " + method2( b + c ) ); 28 System.out.println( "this.a = " + this.a ); 29 System.out.println( "Test3.b = " + Test3.b ); 30 System.out.println( "this.c = " + this.c ); 31 System.out.println( "x = " + x ); 32 System.out.println( "a = " + a ); 33 System.out.println( "b = " + b ); 34 System.out.println( "c = " + c ); 35 }
36 private int method2( int x ) 37 { 38 int b = x; 39 int c = this.c + Test3.b;
40 x = a = b + c;
41 System.out.println( "this.a = " + this.a ); 42 System.out.println( "Test3.b = " + Test3.b ); 43 System.out.println( "this.c = " + this.c ); 44 System.out.println( "x = " + x ); 45 System.out.println( "a = " + a ); 46 System.out.println( "b = " + b ); 47 System.out.println( "c = " + c );
48 Test3.b = b + 2; 49 this.c = a + c;
50 return x + 5; 51 } 52 }
What is the output of this recursive method if it is invoked as ref.mystery( 10 );? Draw Stack Frames to
help you answer this question.
int mystery( int a ) { int b = a - 2;
if ( b >= 7 ) { System.out.println( a + " " + b ); a = b - mystery( b + 1 ); } else { System.out.println( "Stop" ); b = a + 2; }
System.out.println( a + " " + b ); return a + b; }
Output
What gets printed if the value of the actual
argument passed to this method is 0? ________
public void f5( int x ) { int y = 0;
if ( x <= 1 ) y = 3; if ( x <= 2 ) y = 5; if ( x == 3 || x >= 4 ) y = 7; else y = 9;
System.out.println( y ); }
What gets printed if the value of the actual
argument passed to this method is 0? ________
public void f5( int x ) { int y = 0;
if ( x <= 1 ) y = 3; else if ( x <= 2 ) y = 5; else if ( x == 3 || x >= 4 ) y = 7; else y = 9;
System.out.println( y ); }
Scratch Paper
