Question

1. What is the output of the following code fragment? (All variables are of type int.)
limit = 8;
cout << 'H';
for (loopCount = 10; loopCount <= limit; loopCount++)
cout << 'E';
cout << "LP");

2. What is the output of the following code fragment if the input value is 4? (Be careful here.)
int num;
int alpha = 10;
cin >> num;
switch (num)
{
case 3 : alpha++;
case 4 : alpha = alpha + 2;
case 8 : alpha = alpha + 3;
default : alpha = alpha + 4;
}
cout << alpha << endl;

3. What is the output of the following code fragment? (All variables are of type int.)
n = 2;
for (loopCount = 1; loopCount <= 3; loopCount++)

while (n <= 4)

n = 2 * n;

cout << n << endl;

4. Which of the following is not an assertion?

a. a function postcondition

b. both a and b

c. a switch label

d. a function precondition

5. What is the output of the following code fragment? (loopCount is of type int.)
for (loopCount = 1; loopCount > 3; loopCount++)
cout << loopCount << ' ';
cout << "Done" << endl;

6. True or False? (), ++, and – represent three operators that have the highest grouped precedence and ==, +=, -=, ∗=, and / represent three operators that have the lowest grouped precedence?

7. True or False? The code segment
cout << "Do you wish to continue? ";
cin >> response;
while (response != 'Y' && response != 'N')
{
cout << "Do you wish to continue? ";
cin >> response;
}
is equivalent to the following code segment.
do
{
cout << "Do you wish to continue? ";
cin >> response;
} while (response != 'Y' && response != 'N');

8. True or False? The statement
switch (n)
{
case 8 : alpha++; break;
case 3 : beta++; break;
default: gamma++; break;
}
is equivalent to the following statement.
if (n == 8)
alpha++;
else if (n == 3)
beta++;
else
gamma++;

9. What is the value of sum after execution of the following For loop?
sum = 0;
for (count = 1; count <= 21; count++)
sum = sum + count;

10. True or False? The increment and decrement operators (++ and --) operate only on variables, not on constants or arbitrary expressions

Answer 1

1)Output: HLP

Explanation:

If for loop has no curly braces({ }), then the output will be HLP

2)Output: 19

Explanation:

if input (num) is 4, then switch with case 4 will be executed and alpha value will be 10(initial alpha value)+2=12.

Then since case 4 has no break point,control goes to next statement(case 8)

Now alpha = alpha + 3 = 12 + 3 = 15; Since case 8 has also now break point, default statement will also be executed.

Now alpha = alpha + 4= 15 + 4 = 19.

3)Output:

4

8

4)Answer: c)a switch label

5)Done

Explanation:

Because loopCount = 1 is not greater than 3. So loop will never executed.

6)True

7)True

8)True.

Explanation;

Both switch case and if-else statements are logically correct.

9)Answer:  231

Value of sum after execution of the For loop is 231.

10) True

Explanation:

int speed = 25;

speed++; // speed will be incremented by 1

but it does not work for constants. Example 25++ is compile time error.