Chapter 2

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Chapter 2

Flow of Control

This activity contains 10 questions.

What are the values of the variables x and y after executing the following code?

int x = 1, y = 0;
if (x = 0) {
   y = 1;
}
else {
   y = 2;
}

x = 0, y = 1x = 1, y = 1x = 1, y = 2x = 0, y = 2

Which of the following will output "Yes" if the integer variable num is either 2, 3, 4, or 5?

if ((2<=num) && (num<=5)) {
   cout << "Yes" << endl;
}

if ((2<=num) || (num<=5)) {
   cout << "Yes" << endl;
}

if (2 <= num <= 5) {
   cout << "Yes" << endl;
}

if ((2<=num) and (num<=5)) {
   cout << "Yes" << endl;
}

Due to C++'s short-circuit behavior, which of the following expressions will not result in a divide by zero error?

int a = 1, b = 2, c = 3, d = 0;
if ((b>c) && (c/d >0)) {
    cout << "Crash?" << endl;
}

int a = 1, b = 2, c = 3, d = 0;
if ((b<c) && (c/d >0)) {
    cout << "Crash?" << endl;
}

int a = 1, b = 2, c = 3, d = 0;
if ((a+3<c) || (c/d >0)) {
    cout << "Crash?" << endl;
}

int a = 1, b = 2, c = 3, d = 0;
if ((c/d>0) && (a+3<c)) {
    cout << "Crash?" << endl;
}

What value is stored in y after executing the following code? Note that the code has purposely not been indented, which would make the code easier to read.

int x = 0, y = 0;
x = 3;
y = 1;
if (x < 5)
if (x > 3)
y = 2;
else 
y = 3;

y = 1y = 0y = 2y = 3

Which of the following is incorrect regarding the behavior of the switch statements?

A variable may be placed after the "case", for example:

switch (x) {
   case y:  z=1; break;
   default:  z=2;
}

A break statement is needed for each case to keep code from continuing on and executing subsequent cases.Switch only works on variables of integral data types.Multiple case labels are possible, e.g.:

case 1:
case 2:
case 3:   z = 1;   break;

What value is stored in x and y after the following code is executed?

int x=1, y=2;

x = (x<y) ? y*2 : y*3;

x = 4, y = 2x = 4, y = 4x = 6, y = 6x = 6, y = 2

Which of the following loops is equivalent to the loop below?

y=0;
do
{
   y++;
   x++;
} while (x<10);

for (x=0, y=0; x<10; x++) {
  y++;
}

for (y=0; x<10; x++) {
  y++;
  x++;
}

y=0;
y++;
x++;
while (x<10)
{
  y++;
  x++;
}

y=0;
while (x<10)
{
  y++;
  x++;
}

Which of the following snippets of code will force the user to repeatedly input a number until the number entered is either 1 or 2?

x=0;
while ((x!=1) || (x!=2)) {
  cin >> x;
}

x=0;
while ((x!=1) && (x!=2)) {
  cin >> x;
}

x=0;
while ((x==1) && (x==2)) {
  cin >> x;
}

x=1;
while ((x==1) || (x==2)) {
  cin >> x;
}

Which snippet of code correctly adds the odd integers between 1 and 20? (including 1)

int counter, sum;
for (counter=1, sum=0; counter <= 20;)
{
  if ((counter % 2)==0) continue;		
  sum += counter;
  counter++; 
}

int counter, sum;
for (counter=0, sum=0; counter <= 20;)
{
  counter++;
  if ((counter % 2)==0) continue;		
  sum += counter;   
}

int counter, sum;
for (counter=0, sum=0; counter <= 20;)
{
  counter++;
  if ((counter % 2)==0) break;		
  sum += counter;   
}

int counter, sum;
for (counter=1, sum=0; counter <= 20;)
{
  if ((counter % 2)==0) break;		
  sum += counter;
  counter++; 
}

Which code snippet will output a triangle of stars, as shown below?
*

*
****

int i,j;
for (i=0; i<4; i++) {
  for (j=0; j<4; j++) {
   cout << '*';
 }
 cout << endl;
}

int i,j;
for (i=0; i<4; i++) {
  for (j=0; j<=i; j++) {
   cout << '*';
 }
 cout << endl;
}

int i,j;
for (i=0; i<4; i++) {
  for (j=0; j<i; j++) {
   cout << '*';
 }
 cout << endl;
}

int i,j;
for (i=0; i<=4; i++) {
  for (j=0; j<=4; j++) {
   cout << '*';
 }
 cout << endl;
}

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Chapter 2

What are the values of the variables x and y after executing the following code?
int x = 1, y = 0; if (x = 0) { y = 1; } else { y = 2; }

Which of the following will output "Yes" if the integer variable num is either 2, 3, 4, or 5?

Due to C++'s short-circuit behavior, which of the following expressions will not result in a divide by zero error?

What value is stored in y after executing the following code? Note that the code has purposely not been indented, which would make the code easier to read.
int x = 0, y = 0; x = 3; y = 1; if (x < 5) if (x > 3) y = 2; else y = 3;

Which of the following is incorrect regarding the behavior of the switch statements?

What value is stored in x and y after the following code is executed?
int x=1, y=2; x = (x<y) ? y2 : y3;

Which of the following loops is equivalent to the loop below?
y=0; do { y++; x++; } while (x<10);

Which of the following snippets of code will force the user to repeatedly input a number until the number entered is either 1 or 2?

Which snippet of code correctly adds the odd integers between 1 and 20? (including 1)

Which code snippet will output a triangle of stars, as shown below?
*

*
****

Chapter 2

What are the values of the variables x and y after executing the following code? int x = 1, y = 0; if (x = 0) { y = 1; } else { y = 2; }

Which of the following will output "Yes" if the integer variable num is either 2, 3, 4, or 5?

Due to C++'s short-circuit behavior, which of the following expressions will not result in a divide by zero error?

What value is stored in y after executing the following code? Note that the code has purposely not been indented, which would make the code easier to read. int x = 0, y = 0; x = 3; y = 1; if (x < 5) if (x > 3) y = 2; else y = 3;

Which of the following is incorrect regarding the behavior of the switch statements?

What value is stored in x and y after the following code is executed? int x=1, y=2; x = (x<y) ? y*2 : y*3;

Which of the following loops is equivalent to the loop below? y=0; do { y++; x++; } while (x<10);

Which of the following snippets of code will force the user to repeatedly input a number until the number entered is either 1 or 2?

Which snippet of code correctly adds the odd integers between 1 and 20? (including 1)

Which code snippet will output a triangle of stars, as shown below? * ** *** ****

What are the values of the variables x and y after executing the following code?
int x = 1, y = 0; if (x = 0) { y = 1; } else { y = 2; }

What value is stored in y after executing the following code? Note that the code has purposely not been indented, which would make the code easier to read.
int x = 0, y = 0; x = 3; y = 1; if (x < 5) if (x > 3) y = 2; else y = 3;

What value is stored in x and y after the following code is executed?
int x=1, y=2; x = (x<y) ? y2 : y3;

Which of the following loops is equivalent to the loop below?
y=0; do { y++; x++; } while (x<10);

Which code snippet will output a triangle of stars, as shown below?
*

*
****