Variable Types
- What is the output of this program?
public class dynamic_initialize
{
public static void main(String args[])
{
double p, q;
p = 4.5;
q = 10.0;
double r = Math.sqrt(p * p + q * q);
System.out.println(r);
}
}
-
View Hint View Answer Discuss in Forum
NA
Correct Option: C
Variable c has been dynamically initialized to square root of a * a + b * b, during run time.
output: 10.965856099730654
- Which of these is incorrect string literal?
-
View Hint View Answer Discuss in Forum
NA
Correct Option: C
all string literals must begin and end in same line.
- What is the output of this program?
public class scope_var
{
public static void main(String args[])
{
int a;
a = 5;
{
int b = 6;
System.out.print(a + " " + b);
}
System.out.println(a + " " + b);
}
}
-
View Hint View Answer Discuss in Forum
NA
Correct Option: A
scope_var.java:11: error: cannot find symbol
System.out.println(a + " " + b);
^
symbol: variable b
location: class scope_var
1 error
- What is the output of this program?
public class arr_var
{
public static void main(String args[])
{
int array_var [] = new int[20];
for (int i = 0; i < 20; ++i) {
array_var[i] = i/2;
array_var[i]++;
System.out.print(array_var[i] + " ");
i++;
}
}
}
-
View Hint View Answer Discuss in Forum
NA
Correct Option: A
When an array is declared using new operator then all of its elements are initialized to 0 automatically. for loop body is executed 5 times as whenever controls comes in the loop i value is incremented twice, first by i++ in body of loop then by ++i in increment condition of for loop.
output: 1 2 3 4 5 6 7 8 9 10
- What is the output of this program?
public class output
{
public static void main(String args[])
{
int p[] = {5,6,7,8,9};
int q[] = p;
int sum = 0;
for (int j = 0; j < 4; ++j)
sum += (p[j] * q[j + 1]) + (p[j + 1] * q[j]);
System.out.println(sum);
}
}
-
View Hint View Answer Discuss in Forum
NA
Correct Option: A
400
