Java Basic Online Test – 1


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1. Which of these literals can be contained in float data type variable?
A.+1.7e+308
B.-1.7e+308
C.-3.4e+050
D.-3.4e+038

Correct Answer:C.(Range of float data type is -(3.4e38) To +(3.4e38))
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2. Which of the following are legal lines of Java code?
1.int w=(int)888.8;
2.byte x=(byte)100L;
3.longy= (byte)100;
4.byte z=(byte)1000L;

A.3 and 4
B.2 and 3
C.All statements are correct
D.1 and 2

Correct Answer:C.(Statements (1), (2), (3), and (4) are correct. (1) is correct because when a floating-point number (adouble in this case) is cast to an int, it simply loses the digits after the decimal. (2) and (4) are correct because along can be cast into a byte. lf the long is over 127, it loses its precision due to narrowing of the conversion. (3)actually works, even though a cast is not necessary, because a long can store a byte.)
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3. What is the range of short data type in java?
A.-2147483648 t0 2147483647
B.None of the mentioned
C.-128 to 127
D.-32768 to 32767

Correct Answer:D.(Short occupies 16 bits in memory, lts range is from -32768 to 32767.)
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4. What will be the output of the following Java statement?
class output {
public static void main(string args[])
{
double a, b,c;
a= 3.0/0;
b=0/4.0:
c=0/0.0;
System.out.println(a);
System.out.println(b);
System.out.println(c);
}
}

A.0.0
B.NaN
C.all of the mentioned
D.Infinity

Correct Answer:C.(For floating point literals, we have constant value to represent (1 0/0.0) infinity either positive ornegative and also have NaN (not a number for undefined like 0/0.0), but for the integral type, we don’t have anyconstant that’s why we get an arithmetic exception.)
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5. What will be the output of the followingjava code?
class average {
public static void main(string args[])
{
double num[]={5.5,10.1,11,12.8,56.9,2.5};
double result;
result =0:
for (int i= 0;i< 6; ++i)
result =result + num[i];
System.out.print(result/6);
}
}

A.16.46666666666666
B.16.34
C.16.46666666666667
D.16.566666644

Correct Answer:C.(None.
output:
$ javac average.java
$ java average
16.46666666666667.)
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6. What will be the output of the following Java code?
class area {
public static void main(String args[])
{
double r, pi, a;
r=9.8;
pi= 3.14;
a=pi*r*r;
System.out.println(a);
}
}

A.301.56560000*
B.301
C.301.5656
D.301.56

Correct Answer:C.(None.
output:
$ javac area.java
$ java area
301.5656)
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7. Which data type value is returned by all transcendental math functions?
A.float
B.double
C.int
D·long

Correct Answer:B.(Only double data type value is returned by all transcendental math functions. Transcendentalmath functions don’t return int or long. They return double instead of float as double has larger range.)
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8. What is the range of byte data type in java?
A.-32768 to 32767
B.-128 to 127
C.-2147483648 to 2147483647
D.None of the mentioned

Correct Answer:B.(Byte occupies 8 bits in memory. lts range is from -128 to 127)
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9. What will be the output of the following Java code?
class increment {
public static void main(string args[])
{
int g= 3;
System.out.print(++g* 8);
}
}

A.25
B.32
C.24
D.33

Correct Answer:B.(Operator ++ has more preference than *, thus g becomes 4 and when multiplied by 8 gives 32
output:
$ javac increment.java
$ java increment
32)
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10. An expression involving byte, int, and literal numbers is promoted to which of these?
A.byte
B.float
C.long
D.int

Correct Answer:B.( An expression involving bytes, ints, shorts, literal numbers, the entire expression is promoted toint before any calculation is done.)
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