C++ Answers

2.

Assume that each of the following statements applies to the same program.

a.

Write a statement that opens file

oldmast.dat

for

input; use an ifstream object called

inOldMaster.

b.

Write a statement that opens file

trans.dat

for reading

and writing data to it; use fstream object

transFile

that can read data from the file trans.dat

as well as write data to it.

c.

Write a statement that writes a record to the transfile. The record to store consist of an integer data

accountNumber

, and a floating point data

dollarAmount

Find the error(s) and show how to correct it(them) in each of the following.

a.

File

pets.dat

that stores its id, name, age and owner

of the pet is referred to by ofstream object

petfile

.

petfile>>pet_id>>pet_name>>pet_age>>pet_owner;

b.

The following statement should create an ifstream object

salesfile

that refers to the file

weeklysales.dat

that contains data about the id the

salesperson, total sales generated, and the

week number, read the data from the file and display it on the console output.

ifstream salesfile(“weeklysales.dat”);

int id,wk;

float sales;

salesfile>>id>>wk>>sales;

while (!salesfile.eof()){

cout<<id<<”\t”<<sales<<”\t”<<wk<<”\n”;

salesfile<<id<<wk<<sales;

}

Write a program with three functions that calculates the final purchase price after various promotions and sales tax are applied. All functions will use Pass by Reference to manipulate the total purchase price. The functions are described below:

Function #1 = Take 20% off the price

Function #2 = Take an addition $10 off ONLY if the current total is at least $50 (after function #1)

Function #3 = Apply 7% sales tax to the total after function #2

Output:

Enter the total price of your purchases:   [user types: 100]

The final price of your purchase including all promotions and tax is: $74.90

Write a program with three functions that all use the same global constant. The global constant is the name of a video game: "Fun With Math 2". Each of the functions should output a message that contains this global constant. There is one intro message, one game-exit message, and one game completion message. 

Output:

Welcome to Fun With Math 2

This program aims to improve your math skills via interactive games.

Thank you for playing Fun With Math 2

Remember to practice daily!

You have successfully completed all of the activities in Fun With Math 2

Be sure to look out for the 3rd edition of this game (Coming in Summer 2049)!

Create a rectangle class having length and width as parameter. Write getter/setter for

each parameter. Write default constructor that should initialize the default value to the

length and width.. Write member functions to calculate area and another function to

calculate perimeter in class. Write a function to print the information regarding rectangle

which include length, width, area and parameter.

Formula to calculate area = 0.5 * length * width

Formula to calculate perimeter=2 * length+ 2 * width

A code is required to print all possible arrangement of combination of an array(of 'k' elements), i.e. the permutation of the result of combination.

Let's say the array has the following elements (k=4):

"alpha", "beta", "gamma", "delta".

Then, we choose r=3

The expected result is as follows:

alpha beta gamma

alpha gamma beta

beta alpha gamma

beta gamma alpha

gamma alpha beta

gamma beta alpha

alpha beta delta

alpha delta beta

beta alpha delta

beta delta alpha

delta alpha beta

delta beta alpha

alpha delta gamma

alpha gamma delta

delta alpha gamma

delta gamma alpha

gamma alpha delta

gamma delta alpha

beta delta gamma

beta gamma delta

delta beta gamma

delta gamma beta

gamma beta delta

gamma delta beta

From the above result above, all unique PERMUTATION of the COMBINATION of r=3 from the array of k=4 elements is completed.

This is confirmed since 4C3 x 3! = 24 lines of results

Write a program to find length of string by using pointers

Make a function which take a array which store 10 students cgpa. Find the the highest cgpa of student in the array.

Make a function which take an integer array and return sum of all even values.

(Note: Make array of 10 size in the main function)

write a program in c++ to get two numbers and the operators from user:

1 if the operator is + then display sum the sum of two numbers,