Quiz 7 Answer Key

Assignment 21.1: More Barnyard Animals (10 pts)

• In the previous version of this assignment (20.3 from last night's homework) we wrote a program to read in numbers from a file and save them in 5 separate integer variables.
• Now, we will alter the above assignment so that it uses arrays.
• From the previous version of your program, remove the 5 integer variables that you declared at the top of main, and instead, declare an integer array of length 5.

• Now, alter your 5 fin statements to store values in the array instead -- each number at one index of the array
  
• Next, at the top of main, declare a string array named animals, with a corresponding constant variable named SIZE2, assigned the value of 5.
  

• Store the following values in the string array -- one at each index:

• Submit your animals.cpp program to Canvas when you are finished
  

Assignment 21.2: Number of Numbers (10 pts)

• For this assignment you will be working with arrays.
• Open a new C++ file called nums.cpp
  
• Prompt a user to enter in the size of the array (the number of numbers).
• Next, using a for loop, prompt the user to enter that many numbers, and store each one in your array until your array is at full capacity.
• Using the same, or a second, for loop, sum the numbers and report their sum to the user.
• Also, multiply the numbers together and report their product to the user.
• The sum and the product should be printed to one decimal value only.
  
• Your program should work identically to the sample output below:

Enter the number of numbers: 4
Enter 4 numbers:

Number 1: 3.2
Number 2: 6.7
Number 3: 2.9
Number 4: 4.6

The sum of the numbers is: 17.4
And the product is: 286.0

• Another run of the program might give the following output:

Enter the number of numbers: 8
Enter 8 numbers:

Number 1: 2.1
Number 2: -5.6
Number 3: 9.0
Number 4: 8.7
Number 5: -2.2
Number 6: 8.2
Number 7: 9.5
Number 8: 1.4

The sum of the numbers is: 31.1
And the product is: 220931.3

• Upload nums.cpp to Canvas when you are finished.

• Assume you work for a company that tracks customer information, including name, gender and phone numbers
  
• Your company has a file called customers.txt which contains the following information:

• Your task is to read in the data from the above file using a loop, format the data, and write it into a new file called contacts.txt
• When you are finished, contacts.txt should contain the following information:

• In other words, whenever the customers.txt file contains an M below the customer name, the contacts.txt file should have the word Mr. before the name.
• And, whenever the customers.txt file contains an F below the customer name, the contacts.txt file should have the word Ms. before the name.
  
• Finally, whenever the file contains an O below the customer name, the contacts.txt file should have the word Mx. before the name.
  
• In addition, the unformatted phone numbers in customers.txt must be formatted as XXX-XXX-XXXX inside of contacts.txt.
• To format the phone numbers, you must write a function with the following signature:

• Additionally, you must use a while loop to read in the customer information.
• Copy and paste the starter code into a new C++ file called contacts.cpp

#include <iostream>
//add two more libraries here for file I/O
using namespace std;

void formatPhone(string& phone);
//Takes an unformatted 10-digit phone number as a string
//Formats the string in the format XXX-XXX-XXXX

int main() {
    string name, gender, phone;
   
    //declare your input file stream variable here
    //open the customer.txt file
    //check for failure
   
    //decare your output file stream variable here
    //open contacts.txt file
    //check for failure
   
    while () { //Will you need fin >> or getline() inside the while loop test to read in the name?
        fin >> gender;
        //one more line here to read in the phone number
        //if, else if and else statements here
       
        //function call to formatPhone here to alter the phone number

        //call fin.ignore() or fin >> ws to avoid problem when fin before a getline

    }
   
    //close your input and output file streams
   
    return 0;
   
}

• When your code is providing the correct output in the contacts.txt file, upload your contacts.cpp file to Canvas