devry comp122 all weeks homework

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COMP122Week 2 Homework

Complete the following problems.

1. Suppose you are given the following variable declarations:

int x, y;

char ch;

What values (if any) are assigned to x, y, and ch after each of these statements execute?

Assume that the input to each statement is the same: 5 28 36

a. cin >> x >> y >> ch;

b. cin >> ch >> x >> y;

c. cin >> x >> ch >> y;

d. cin >> x >> y;

cin.get(ch);

2. Suppose you are given the following variable declarations:

int x, y;

char ch;

What values (if any) are assigned to x, y, and ch after each of these statements execute?

Assume that the input to each set of statements is as follows:

13 28 D

14 E 98

A B 56

a. cin >> x >> y;

cin.ignore(50, ‘\n’);

cin >> ch;

b. cin >> x;

cin.ignore(50, ‘\n’);

cin >> y;

cin.ignore(50, ‘\n’);

cin.get(ch);

3. Suppose you are given the following variable declarations:

int x, y;

double z;

char ch;

Assume you have the following input statement:

cin >> x >> y >> ch >> z;

What values (if any) are stored in x, y, z, and ch if the input is:

a. 35 62. 78

b. 86 32A 92.6

c. 12 .45A 32

4. Write a C++ statement that uses the manipulator ‘setfill’ to output a line containing 35 asterisk characters.

5. What is the output from the following statements?

a. if ( 60 <= 12 * 5)

cout << “Hello”;

cout << ” There”;

b. if (‘a’ > ‘b’ || 66 > static_cast<int>(‘A’))

cout << “#*#” << endl;

c. if (7 <= 7)

cout << 6 – 9 * 2 / 6 << endl;

d. if (7 < 8)

{

cout << “2 4 6 8” << endl;

cout << “1 3 5 7” << endl;

}

e. if (5 < 3)

cout << “*”;

else if (7 == 8)

cout << “&”;

else

cout << “$”;

6. Suppose that you have the following variable declarations:

int x = 10;

int y = 15;

int z = 20;

Determine whether the following expressions are true or false.

a. !(x < 10)

b. x <= 5 || y > 15

c. (x != 5) && (y == z)

d. x <= z && (x + y >= z)

7. What is the output of the following code fragment?

int x = 100;

int y = 200;

if (x > 100 && y <= 200)

cout << x << ” ” << y << ” ” << x + y << endl;

else

cout << x << ” ” << y << ” ” << 2 * x – y << endl;

8. Given a char variable called gender, write C++ statements to output “Male” if gender contains upper or lower case M, “Female” if it contains upper or lower case F, or “Invalid Gender” if it contains anything else. Use if / else if statements.

9. Given a char variable called gender, write C++ statements to out “Male” if gender contains upper or lower case M, “Female” if it contains upper or lower case F, or “Invalid Gender” if it contains anything else. Use a switch statement.

10. What is the value of the beta variable after the following code executes?

int beta = 3;

switch(beta)

{

case 3:

beta += 3;

case 1:

beta++;

break;

case 5:

beta += 5;

case 4:

beta += 4;

}

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;

}

<pstyle=”color: rgb(0,=”” 0,=”” 0);=”” font-size:=”” 12px;”=””>COMP122Week 5 Homework

Complete the following problems.

1. Determine the value of the following expressions.

a. toupper(‘b’)

b. tolower(‘C’);

c. pow(3.0,3.0);

d. sqrt(81.0);

e. fabs(-1.23);

f. floor(22.46);

g. ceil(33.3);

2. Using the functions in the cmath library, write the following mathematical formulas as C++ expressions.

a. 3.0^2.4

b. (x – y)^1/2Note: the ½ power is the square root

c. |y – 42.3|

d.( -b + (b² – 4ac)^1/2) / 2a

3. Consider the following functions:

int func1(int x)

{

int r, s;

r = 2 * x;

if (r > 10)
{

s = x / 2;

}

else
{

s = x / 3;
}

return s – 2;

}

int func2(int a, int b)

{

int r, s;

s = 0;

for(r = a; r < b; r++)

{

s++;

}

return s;

}

What is the output from the following program fragments?

int a, b;

a. a = 10;
cout << func1(a) << endl;

b. a = 5; b = 12;

cout << func2(a, b) << endl;
c. a = 8;

b = func1(a);

cout << a << ” ” << b << ” ” << func2(a, b) << endl;

4. Write a C++ function that has an input of a char value and returns true if the character is lower case or false otherwise.

5. Write a C++ function that has three inputs which are integers. The function returns true if the first number raised to the power of the second number equals the third number.

6. What is a function prototype? When is it needed?

7. What is the difference between an actual parameter and a formal parameter?

8. Explain the difference between pass by value parameters and pass by reference parameters.

9. Explain the difference between function parameters, local variables, and global variables regarding the parts of a program that can access these values.

10. What does void signify when used as the return type of a function?

11. What is the output of the following program fragment:

void find(int a, int& b, int& c)
{
int temp;

c = a + b;

temp = a;

a = b;

b = 2 * temp;

}

int main()

{

int x, y, z;

x = 15;

y = 25;

z = 30;

find(x, y, z);

cout << x << ” ” << y << ” ” << z << endl;

find(y, x, z);

cout << x << ” ” << y << ” ” << z << endl;

find(z, y, x);

cout << x << ” ” << y << ” ” << z << endl;

}

12. Write a C++ function which initializes its three reference parameters. The function should take an int, double, and string parameter and initialize them to 0 and the empty string (“”).

COMP122

Week 6 Homework

Complete the following problems.

1. Write C++ statements to do the following:

a. Declare an array alpha of 15 components of type int.

b. Output the value of the 10^th component of the alpha array.

c. Set the value of the 5^th component of the alpha array to 35.

d. Set the value of the 9^th component of the alpha array to the sum of the 6^th and 13^thcomponents of the alpha array.

e. Set the value of the 4^th component of the alpha array to three times the value of the 8^th component minus 57.

f. Output alpha so that five components appear on each line.

2. What is stored in the list array after the following code executes?

int list[5];

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

{

list[j] = 2 * j + 5;

if (j % 2 == 0)
{

list[j] = list[j] – 3;
}

}

3. What does array index out of bounds mean? What can happen if this occurs in your program?

4. Write C++ statements to define and initialize the following arrays using appropriate data types:

a. An array of heights has 6 components which have the following values: 5.5, 5.8, 6.3, 6.6, 4.9, 5.9.

b. An array of weights has 4 components which have the values: 140, 165, 190, 207.

c. An array of symbols which contains the following characters: ‘$’, ‘%’, ‘@’, ‘!’, ‘|’, ‘&’.

d. An array of the seasons which contains “Spring”, “Summer”, “Fall”, “Winter”.

5. Given the following declaration, what is stored in the 8^th element of the array?

int list[10] = {1, 2, 3, 4, 5};

6. When an array is passed as an actual parameter to a function, what is really being passed in to the function? Why are arrays passed this way?

7. Write a for loop to initialize the following array (int data[10]) with the values 10, 9, 8… 1.

8. Given an array of 10 doubles named data, write a loop that loads the array with user input.

9. Given an array of 100 doubles named data, write a loop that creates the sum of all the array elements.

10. Write a loop that finds the smallest element in an integer array called data containing 100 elements.

COMP122

Week 7 Homework

Part 1: Complete the following problems.

1. Answer the questions that follow given these lines of code.

string str1, str2;

cin >> str1 >> str2;

if(str1 == str2)

{

cout << str1 << ” == ” << str2 << endl;

}

else if (str1 > str2)

{

cout << str1 << ” > ” << str2 << endl;

}

else

{

cout << str1 << ” < ” str2 << endl;

}

a. What do these lines output if the input is “diamond diamond”?

b. What do these lines output if the input is “diamond gold”?

c. What do these lines output if the input is “silver gold”?

2. What is the output of the following program fragment?

string s1 = “Ball Park”;

string s2 = “Going to”;

string s3 = “the”;

string str;

cout << s2 << ” ” << s3 << ” ” << s1 << endl;

cout << s1.length() << endl;

cout << s1.find(‘P’) << endl;

cout << s1.substr(0, 4) << endl;

str = “abcdefghijk”;

cout << str << endl;

cout << str.length() << endl;

str[0] = ‘A’;

str[3] = ‘D’;

cout << str << endl;

3. What is output from each of the following statements? Assume each statement is independent of all the others.

string str = “Now is the time for the party!”;

a. cout << str.size() << endl;

b. cout << str.substr(7, 8) << endl;

c. cout << str.insert(11, “best “) << endl;

d. str.erase(16, 14);

str.insert(16, “to study for the exam!”);

cout << str << endl;

Part 2: Complete the following problems.

4. Given the following declaration: char str[16];

mark the following statements as valid or invalid and if invalid, explain why.

a. strcpy(str, “Hello there”);

b. strlen(str);

c. str = “Jacksonville”;

d. cin >> str;

e. cout << str;

f. if ( str >= “Nice guy”)

cout << str;

g. str[6] = ‘t’;

5. Given the following declarations:

char s1[15];

char s2[15] = “Good Day!”;

Write C++ statements to do the following. Note: No loops allowed!

a. Copy s2 to s1.

b. Check if s1 and s2 contain the same string and output a message if they are equal.

c. If s1 is less than s2, output s1. Otherwise output s2.

d. Store the string “Sunny Day” into s1.

e. Store the length of s2 into an int variable named length.

6. Given the following declarations:

char name[21] = “Bob”;

char yourName[21] = “Joe”;

char studentName[31] = “Joe Bob”;

Mark each of the following as valid or invalid. If invalid, explain why.

a. cin >> name;

b. cout << studentName;

c. yourName[0] = ‘\0’;

d. yourName = studentName;

e. if (yourName == name)

studentName = name;

f. int x = strcmp(yourName, studentName);

g. strcpy(studentName, name);

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