using c++

1. Read the source code, paying special attention to how each loop is controlled. Then complete the Expected Output column, writing down the output you think each cout statement will produce. Run the program and complete the observed output column.

#include

using namespace std;

8 int main()

9 {

10 int i, // Loop control variable

11 sum; // Accumulator

12

13 i = 1;

14 while (i < 10)

15 { cout << i << ' ';

16 i +=2;

17 }

18 cout << " After loop i = " << i

19 << endl << endl;

20

21 i = 5;

22 while (i > 0)

23 cout << i--<< ' ';

24 cout << " After loop i = " << i

25 << endl << endl;

return 0;

}

Expected Output and Observed Output

after loop i (line 18) _______ ________

after loop i (line 24) _______ ________

Counting and Looping

The program in lab8.cpp prints

"I love Computer Science!!" 10 times.

Once the program is compiling and running, modify it as follows:

Instead of using constant LIMIT, ask the user how many times the message should be printed. You will need to declare a variable (e.g.int numTimes) to store the user's response and use that variable to control the loop. (Remember that all caps is used only for constants!)

Number each line in the output, and add a message at the end of the loop that says how

many times the message was printed.

// ****************************************************************

//lab8.cpp

//

// Use a while loop to print many messages declaring your

// passion for computer science

// ****************************************************************

#include

using namespace std;

int main{

// *** Step 2: Create an int called numTimes

// *** Step 2: Get rid of this, prompt the user for numTimes instead const

int LIMIT = 10;

int count = 1;

// *** Step 2: Change this to check if count is <= numTimes

while(count <= LIMIT)

{

// *** Step 2: Change this line to output count before the phrase

cout<

;

// *** Step 1: Increment count (hint: use the ++ operator)

}

// *** Step 2: Output the "Printed this message..." line

}

}

Here's an example of how the program should look when it's all finished. Bold, bracketed text stands for user input.

How many times should I print? [3]

1 I love Computer Science!!

2 I love Computer Science!!

3 I love Computer Science!!

Printed this message 3 times.