CSC126_Chapter4_Part1

Discover the problem of the following line of codes:
for (int i = 1; i<=2; ++i)

• The loop condition i=<2 should be i<=2

• The semicolons should be changed to commas.

• The update statement ++i should be changed to i++

• There should be a semicolon at the end of the for statement.

Which of the following for loop causes an infinite loop?

• for (int i=0; i<10; i--)

  {

  cout << i;

  }

• for (int i=0; i<10; i+=2)

  {

  cout << i;

  }

• for (int i=10; i>0; i--)

  {

  cout << i;

  }

• for (int i=0; i>10; i+=2)

  {

  cout << i;

  }

What is the main purpose of a repetition structure?

• To store data in a specific order

• To execute a single instruction

• To repeat one or more instructions until a condition is met

• To control user input

Which of the following is NOT a basic type of repetition structure in C++?

• for loop

• while loop

• switch loop

• do…while loop

What is a Loop Control Variable (LCV)?

• A function to print output

• A variable that controls the flow of the program

• A component to read user input

• A syntax for conditional looping

Where is the LCV placed in a for loop statement?

• Inside the function block

• In the parameters of the for loop (initialization, condition, update)

• Outside the main function

• Only inside void functions

How many times will the following code print *?
for(int i=1; i<=3; i++) cout << "*";

• 2

• 3

• 4

• 0

What is the output of the following code?
for (int i=3; i>=1; i--) cout << i << " ";

• 1 2 3

• 3 2 1

• 1 3 2

• 2 1 3

Why does the following code produce only one `*`?
for(int i=1; i<=3; i++);

cout << "*";

• Invalid syntax

• Loop never ends

• Semicolon ends the loop, so cout is outside

• Comment not closed properly

What is the main purpose of the update statement in a for loop?

• To define the loop type

• To evaluate the condition

• To update the value of the control variable

• To print output