Java Reference
In-Depth Information
public static void
main(String[] arg)
{
count = 1;
sum = count + PRIME;
x := 25.67;
newNum = count * ONE + 2;
sum + count = sum;
x = x + sum * COUNT;
System.out.println(" count = " + count + ", sum = "
+ sum + ", PRIME = " + Prime);
2
}
}
26.
What action must be taken, before a variable can be used in a program?
27.
Explain why the
class
String
need not be explicitly imported in a
program using an
import
statement.
28.
Write equivalent compound statements for the following, if possible.
a.
x = 2 * x;
b.
x = x + y - 2;
c.
sum = sum + num;
d.
z = z * x + 2 * z;
e.
y = y / (x + 5);
29.
Write the following compound statements as equivalent simple statements.
a.
x += 5 - z;
y *= 2 * x + 5 - z;
b.
w += 2 * z + 4;
c.
x -= z + y - t;
d.
sum += num;
e.
x /= y - 2;
f.
Suppose
a
,
b
, and
c
are
int
variables and
a = 5
and
b = 6
. What value is
assigned to each variable after each statement executes? If a variable is
undefined at a particular statement, report
UND
(undefined).
30.
a
b
c
a = (b++) + 3;
c = 2 * a + (++b);
b = 2 * (++c) - (a++);
Suppose
a
,
b
, and sum are
int
variables and
c
is a
double
variable. What
value is assigned to each variable after each statement executes? Suppose
a = 3
,
b = 5
, and
c = 14.1
.
31.
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