devry comp122 week 3 homework

COMP122

Week 3 Homework

Complete the following problems.

1. What is the output from the following C++ code fragment?

int count = 1;

int y = 100;

while(count < 100)

{

y = y – 1;

count++;

}

cout << “y = ” << y << ” and count = ” << count << endl;

2. What is the output from the following C++ code fragment?

int num = 1;

while(num < 10)

{

cout << num << ” “;

num += 2;

}

cout << endl;

3. What is the output from the following C++ code fragment if the following values are the inputs to cin?

38 35 71 14 -10

int sum, num;

cin >> sum;

for(int j = 1; j <= 3; j++)

{

cin >> num;

sum += num;

}

cout << “Sum = ” << sum << endl;

4.What is the output from the following C++ code fragment if the following values are the inputs to cin?

38 35 71 14 -1

int sum, num;

sum = 0;

cin >> num;

while(num != -1)

{

sum += num;

cin >> num;

}

cout << “Sum = ” << sum << endl;

5. Write a do – while loop to get 20 numbers from the user and sum them together. Output the sum after the loop. Declare any variables you need.

6.What is the output from the following C++ code fragment if the following values are the inputs to cin?

58 23 75 176 145 -999

int num;

cin >> num;

while(num != -999)

{

cout << num % 25 << ” “;

cin >> num;

}

cout << endl;

7.What is the output from the following C++ code fragment?

int count = 10;

while(count– > 0)

{

cout << count << ” “;

}

cout << endl;

8.What is the output from the following C++ code fragment?

int count = 1;

do

{

cout << count * (count – 1) << ” “;

}while(++count <=5);

cout << endl;

9. Given the following C++ code fragment, answer the questions that follow.

int s = 0;

for(int i = 0; i < 5; i++)

{

s = 2 * s + i;

}

a. What is the final value of s?

b. If the expression i++ was replaced with i += 2 what would be the final value of s?

c. If a semi-colon is added following the right parenthesis of the for statement, what would be the final value of s?

10. Write a for statement to add all the multiples of three between 1 and 100. (ie. 3, 6, 9, … 99).

11. How many times will the loop bodies execute in the following loops?

a. int x = 5, y = 50;

do

{

x += 10;

}while(x < y);

b. int x = 25, y = 5;

while(x >= y)

{

x -= 5;

}

c. int y = 0;

for(int x = 5; x < 100; x += 5)

{

y++;

}

d. int x = 10, y = 1000;

while(x <= y);

{

x *= 10;

}

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