Flow Control(Java Program ) Questions and answers for exam Preparation

Question 1. Determine output:
public class Test{
public static void main(String args[]){
int i;
for(i = 1; i < 6; i++){
if(i > 3) continue ;
}
System.out.println(i);
}
}

Explanation:-

Answer: Option E. -> 6

Question 2. In java, ............ can only test for equality, where as .......... can evaluate any type of the Boolean expression.

switch, if
if, switch
if, break
continue, if

Explanation:-

Answer: Option A. -> switch, if

Question 3. Consider the following program written in Java.
class Test{
public static void main(String args[]){
int x=7;
if(x==2); // Note the semicolon
System.out.println("NumberSeven");
System.out.println("NotSeven");
}
}
What would the output of the program be?

Explanation:-

Answer: Option A. -> NumberSeven NotSeven

Question 4. What will be the output of the following program?
public class Test{
public static void main(String args[]){
int i = 0, j = 5 ;
for( ; (i < 3) && (j++ < 10) ; i++ ){
System.out.print(" " + i + " " + j );
}
System.out.print(" " + i + " " + j );
}
}

0 6 1 7 2 8 3 8
0 6 1 7 2 8 3 9
0 6 1 5 2 5 3 5
Compilation Error

Explanation:-

Answer: Option A. -> 0 6 1 7 2 8 3 8

Question 5. Determine output:
public class Test{
public static void main(String args[]){
int i, j;
for(i=1, j=0;i

Explanation:-

Answer: Option A. -> 10
In giving a program for loop will be break when i=10. Since after for only one statement execute ( j += i;) because brace is not mentioned and after that print statement will execute and print i=10

Question 6. What will be the output?
public class Test{
public static void main(String[] args){
int x=10, y=0;
if(x && y){
System.out.print("TRUE");
}
else{
System.out.print("FALSE");
}
}
}

FALSE
TRUE
Compilation Error
Runtime Error

Explanation:-

Answer: Option C. -> Compilation Error
bad operand types for binary operator '&&'
if(x && y)

Question 7. How many times will the following code print "Welcome to Examveda"?
int count = 0;
do {
System.out.println("Welcome to Examveda");
count++;
} while (count < 10);

Explanation:-

Answer: Option C. -> 10

Question 8. Choose the correct statement in context of the following program code.
public class Test{
public static void main(String[] args){
double sum = 0;
for(double d = 0; d < 10;){
d += 0.1;
sum += sum + d;
}
}
}

The program has a compile error because the adjustment is missing in the for loop.
The program has a compile error because the control variable in the for loop cannot be of the double type.
The program runs in an infinite loop because d
The program compiles and runs fine.

Explanation:-

Answer: Option D. -> The program compiles and runs fine.

Question 9. What is the printout of the following switch statement?
char ch = 'a';
switch (ch){
case 'a':
case 'A': System.out.print(ch); break;
case 'b':
case 'B': System.out.print(ch); break;
case 'c':
case 'C': System.out.print(ch); break;
case 'd':
case 'D': System.out.print(ch);
}

Explanation:-

Answer: Option C. -> a

Question 10. What will be the value of y after execution of switch statement?
public class Test{
public static void main(String[] args){
int x = 3, y = 4;
switch(x + 3){
case 6: y = 0;
case 7: y = 1;
default: y += 1;
}
}
}

Explanation:-

Answer: Option B. -> 2
Initially 'x' = 3 and y =4 when switch statement execute switch(x + 3) case 6 will be executed and initialize y = 0 and after that case 7 will be executed (because there is no break statement so it will execute all the case) and initialize y = 1 and after that default case execute which add 1 in y and y become 2.