Question 46
class GFM12 {
static int x; // 1
public static void main(String[] args) { // 2
int y; // 3
System.out.println("x="+x); // 4
System.out.println("y="+y); // 5
}}What is the result of attempting to compile and run the program?
a. Compile-time error at line 1.
b. Compile-time error at line 2.
c. Compile-time error at line 3.
d. Compile-time error at line 4.
e. Compile-time error at line 5.
f. Run-time error
g. None of the above
Question 47
class GFM13 {
static byte a; static short b; static char c;
static int d; static long e; static String s;
public static void main(String[] args) {
System.out.println(a+b+c+d+e+s);
}}What is the result of attempting to compile and run the program?
a. Prints: 00000null
b. Prints: 00000
c. Prints: 0null
d. Prints: 0
e. Prints: null
f. Compile-time error
g. Run-time error
h. None of the above
Question 48
class GFM14 {
static byte a; static short b; static char c;
static int d; static long e; static String s;
public static void main(String[] args) {
System.out.println(a+","+b+","+(int)c+","+d+","+e+","+s);
}}What is the result of attempting to compile and run the program?
a. Prints: 0,0,0,0,0,null
b. Prints: 0,0,0,0,0,
c. Prints: 0,0, ,0,0,
d. Compile-time error
e. Run-time error
f. None of the above
Question 49
class GFM15 {
static int a; static float b; static double c;
static boolean d; static String s;
public static void main(String[] args) {
System.out.println(a+","+b+","+c+","+d+","+s);
}}What is the result of attempting to compile and run the program?
a. Prints: 0,0,0,false,null
b. Prints: 0,0,0,false,
c. Prints: 0,0.0,0.0,false,null
d. Prints: 0,0.0,0.0,false,
e. Prints: 0,0.0,0.0,true,null
f. Prints: 0,0.0,0.0,true,
g. Prints: 0,0,0,true,null
h. Prints: 0,0,0,true,
i. Compile-time error
j. Run-time error
k. None of the above
Question 50
class GFM16 {
static int m1 (int i1, int i2) {
int i3;
if (i1 > 0) {i3 = i1 + i2;}
return i3;
}
public static void main(String[] args) {
System.out.println(m1(1,2));
}}What is the result of attempting to compile and run the program?
a. Prints: 0
b. Prints: 1
c. Compile-time error
d. Run-time error
e. None of the above
Question 51
class GFM17 {
int x; // 1
public static void main(String[] args) { // 2
int y = 0; // 3
System.out.print(x+","); // 4
System.out.print(y); // 5
}}What is the result of attempting to compile and run the program?
a. Prints: 0,0
b. Compile-time error at line 1.
c. Compile-time error at line 1.
d. Compile-time error at line 2.
e. Compile-time error at line 3.
f. Compile-time error at line 4.
g. Compile-time error at line 5.
h. Run-time error
i. None of the above
Question 52
class JJF1 {
public static void main (String args[]) {
System.out.print(Byte.MIN_VALUE+",");
System.out.print(Byte.MAX_VALUE);
}}What is the result of attempting to compile and run the program?
a. Prints: 0,255
b. Prints: 0,256
c. Prints: -127,128
d. Prints: -128,127
e. Compile-time error
f. Run-time error
g. None of the above
Question 53
class JJF2 {
public static void main (String args[]) {
System.out.print(Short.MIN_VALUE+",");
System.out.print(Short.MAX_VALUE);
}}What is the result of attempting to compile and run the program?
a. Prints: -32767,32768
b. Prints: -32768,32767
c. Prints: 0,65535
d. Prints: 0,65536
e. Compile-time error
f. Run-time error
g. None of the above
Question 54
class JJF3 {
public static void main(String args[]) {
System.out.print(Integer.toBinaryString(Byte.MAX_VALUE)+",");
System.out.print(Integer.toOctalString(Byte.MAX_VALUE)+",");
System.out.print(Integer.toString(Byte.MAX_VALUE)+",");
System.out.print(Integer.toHexString(Byte.MAX_VALUE));
}}What is the result of attempting to compile and run the program?
a. Prints: 1111111,177,127,7f
b. Prints: 11111111,377,256,ff
c. Compile-time error
d. Run-time error
e. None of the above
Question 55
class JJF4 {
public static void main(String args[]) {
System.out.print(Long.toHexString(Byte.MAX_VALUE)+",");
System.out.print(Long.toHexString(Character.MAX_VALUE)+",");
System.out.print(Long.toHexString(Short.MAX_VALUE));
}}What is the result of attempting to compile and run the program?
a. Prints: f,ff,7f
b. Prints: f,ff,ff
c. Prints: 7f,ffff,7fff
d. Prints: ff,ffff,ffff
e. Prints: 7fff,ffffff,7fffff
f. Prints: ffff,ffffff,ffffff
g. Compile-time error
h. Run-time error
i. None of the above
Question 56
class JJF5 {
public static void main(String args[]) {
System.out.print(Integer.toHexString(Integer.MIN_VALUE)+",");
System.out.print(Integer.toHexString(Integer.MAX_VALUE));
}}What is the result of attempting to compile and run the program?
a. Prints: 0000,ffff
b. Prints: 00000000,ffffffff
c. Prints: 7fff,8000
d. Prints: 8000,7fff
e. Prints: 7fffffff,80000000
f. Prints: 80000000,7fffffff
g. Compile-time error
h. Run-time error
i. None of the above
Question 57
Which of the following represent the full range of type char?
a. '\u0000' to '\u7fff'
b. '\u0000' to '\uffff'
c. 0 to 32767
d. 0 to 65535
e. -32768 to 32767
f. -65536 to 65535
Question 58
Which of the following represent the full range of type char?
a. -0x8000 to 0x7fff
b. 0x0000 to 0xffff
c. -0100000 to 077777
d. 0 to 0177777
e. 0 to 32767
f. 0 to 65535
g. -32768 to 32767
Question 59
class JJF6 {
char c1 = 0xffff; // 1
char c2 = 0xfffff; // 2
byte b1 = 0xffff; // 3
byte b2 = 0x7f; // 4
byte b3 = 0xff; // 5
byte b4 = -0x80; // 6
}Compile-time errors are generated at which lines?
a. 1
b. 2
c. 3
d. 4
e. 5
f. 6
Question 60
class MCZ11 {
public static void main (String[] args) {
char a = '\c'; // 1
char b = '\r'; // 2
char c = '\"'; // 3
char d = '\b'; // 4
char e = '\''; // 5
}}A compile-time error is generated at which line?
a. 1
b. 2
c. 3
d. 4
e. 5
f. None of the above
|
46
|
e
|
Compile-time error at line 5.
|
The local variable y
has not been initialized so the attempt to access the variable results in a
compile-time error.
|
||||
|
47
|
c
|
Prints: 0null
|
The numeric sum of variables a, b, c, d
and e is zero. The zero is converted
to a String and concatenated with s.
|
||||
|
48
|
a
|
Prints: 0,0,0,0,0,null
|
The default value of type char
is the null character. When it is
cast to an int the value is
interpreted as zero.
|
||||
|
49
|
c
|
Prints: 0,0.0,0.0,false,null
|
Generally speaking, numeric type variables are initialized
to zero. Primitive boolean variables
are initialized to false. Reference
type variables are initialized to null.
|
||||
|
50
|
c
|
Compile-time error
|
Local variables are not initialized automatically, and
must be initialized explicitly before attempting to access the value. The
local variable i3 will not be initialized if i1 is less than or equal to
zero; so the result is a compile-time error.
|
||||
|
51
|
f
|
Compile-time error at line 4.
|
Anytime a field is accessed from within a static context
it is very important to verify that the field is also static. If the field is
instead an instance variable then the result is a Compile-time error.
|
||||
|
52
|
d
|
Prints: -128,127
|
A byte is an 8
bit signed value; so the minimum byte
value is -(27) and the
maximum value is (27 - 1).
|
||||
|
53
|
b
|
Prints: -32768,32767
|
A short is a 16
bit signed value; so the minimum short
value is -(215) and the
maximum value is (215 - 1).
|
||||
|
54
|
a
|
Prints: 1111111,177,127,7f
|
A byte is an 8 bit signed value. The left most bit is the
sign bit. The sign bit is set to zero for positive numbers and is set to one
for negative numbers. The most positive byte value is represented as a sign
bit that is set to zero and all of the other bits set to one. The Integer.toBinaryString
method does not print leading zeros; so only seven bits are printed. An eight
bit binary value is represented as three octal digits. The first of the three
digits represents the left most two bits of the binary value. In this case,
the left most two bits are zero and one. The second octal digit represents
the next three bits of the binary value. The last of the octal digits
represents the right most three bits of binary value. Note that the
Integer.toOctalString method does not print a leading zero as is required for
an octal literal value. An eight bit binary value is represented as two
hexadecimal digits. The left hex digit represents the left most four bits of
the binary value. The right hex digit represents the right most four bits of
the binary value.
|
||||
|
55
|
c
|
Prints: 7f,ffff,7fff
|
A byte is an 8
bit signed value. A char is a 16 bit
unsigned value. A short is a 16 bit
signed value. The left most bit of a signed value is the sign bit. The sign
bit is zero for positive numbers and one for negative numbers. The maximum byte value in hexadecimal format is 7f and in decimal format is 127. The minimum byte value in hexadecimal format is 80 and in decimal format is -128.
The byte value of decimal -1 is ff
in hexadecimal.
|
||||
|
56
|
f
|
Prints: 80000000,7fffffff
|
An int is a 32
bit signed value. The left most bit is the sign bit. The sign bit is zero for
positive numbers and one for negative numbers.
|
||||
|
57
|
b d
|
'\u0000' to '\uffff' 0 to 65535
|
A char is a 16
bit unsigned value; so none of the char
values are negative and the minimum value is zero. The maximum value is 216 - 1.
|
||||
|
58
|
b d
f
|
0x0000 to 0xffff 0 to 0177777 0 to 65535
|
A char is a 16
bit unsigned value; so none of the char
values are negative and the minimum value is zero. The maximum value is 216 - 1.
|
||||
|
59
|
b c
e
|
2 3 5
|
The maximum char
value is 0xffff. The maximum byte value is 127 = 0x7f. The hex
value 0xff is of type int, and the decimal value is 255. The maximum positive value of type byte is 127.
The value 255 is beyond the range of
type byte; so 255 can not be assigned to type byte without an explicit cast. The
assignment expression b3 = (byte)0xff
would assign the value -1 to
variable b3.
|
||||
|
60
|
a
|
1
|
The escape sequences are as follows: '\b' (backspace),
'\f' (formfeed), '\n' (newline), '\r' (carriage return), '\t' (horizontal
tab), '\\' (backslash), '\"' (double quote), '\'' (single quote). Yes,
you must memorize the escape sequences! Just remember "big farms need red
tractors".
|
||||
No comments:
Post a Comment