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Exercise 1. The American Equities investment company offers a wide range of investment opportunities ranging from mutual funds to bonds. Investors can check the val- ue of their portfolio from the American Equities’ web page. Information about personal portfolios is protected via encryption and can only be accessed using a password. The American Equities company requires that a password consist of 8 characters, 5 of which must be letters and the other 3 digits. The letters and dig- its can be arranged in any order. For example, rt56AA7q 123actyN 1Lo0Dwa9 myNUM741 are all valid passwords. However, the following are all invalid: the476NEw It contains more than 8 characters (also more than 5 letters) be68moon It contains less than 3 digits. $retrn99 It contains only 2 digits and has an invalid character (‘$’) American Equities needs a program for their web page that determines whether or not an entered password is valid. The program american_equities.cpp *”code pasted below”* from the Lab 10 folder performs this task. Exercise 1: Fill in the code in bold and then run the program several times with both valid and invalid passwords. Read through the program and make sure you understand the logic of the code. Exercise 2: Alter the program so that a valid password consists of 10 charac- ters, 6 of which must be digits and the other 4 letters. Exercise 3: Adjust your program from Exercise 2 so that only lower case letters are allowed for valid passwords. american_equities.cpp: This program tests a password for the American Equities web page to see if the format is correct Place Your Name Here include include include using namespace std; function prototypes bool testPassWord(char[]); int countLetters(char*); int countDigits(char*); int main() { char passWord[20]; cout << "Enter a password consisting of exactly 5 " << "letters and 3 digits:" << endl; cin.getline(passWord,20); if (testPassWord(passWord)) cout << "Please wait - your password is being verified" << endl; else { cout << "Invalid password. Please enter a password " << "with exactly 5 letters and 3 digits" << endl; cout << "For example, my37RuN9 is valid" << endl; } FILL IN THE CODE THAT WILL CALL countLetters and countDigits and will print to the screen both the number of letters and digits contained in the password. return 0; } testPassWord task: determines if the word contained in the character array passed to it, contains exactly 5 letters and 3 digits. data in: a word contained in a character array data returned: true if the word contains 5 letters & 3 digits, false otherwise bool testPassWord(char custPass[]) { int numLetters, numDigits, length; length = strlen(custPass); numLetters = countLetters(custPass); numDigits = countDigits(custPass); if (numLetters == 5 && numDigits == 3 && length == 8 ) return true; else return false; } the next 2 functions are from Sample Program 10.5 countLetters task: counts the number of letters (both capital and lower case in the string data in: a string data returned: the number of letters in the string int countLetters(char *strPtr) { int occurs = 0; while(*strPtr != '\0') { if (isalpha(*strPtr)) occurs++; strPtr++; } return occurs; } countDigits task: counts the number of digitts in the string data in: a string data returned: the number of digits in the string int countDigits(char *strPtr) this function counts the number of digits { int occurs = 0; while(*strPtr != '\0') { if (isdigit(*strPtr)) isdigit determines if the character is a digit occurs++; strPtr++; } return occurs; } Exercise 2. Bring in case_convert.cpp "code is below" from the Lab 10 folder. Note that this is Sample Program 10.2. Exercise 1: Run the program several times with various inputs. Exercise 2: Notice the following do-while loop which appears near the end of the program: do { } while(toupper(choice) != 'Y' && toupper(choice) != 'N'); How would the execution of the program be different if we removed this loop? Try removing the loop but leave the following lines in the program: cout << "Would you like to find the average for another month?"; cout << endl << "Enter Y or N" << endl; cin >> choice; Record what happens when you run the new version of the program using comments in the .cpp file. Exercise 3: Alter program case_convert.cpp so that it performs the same task but uses tolower rather than toupper. case_convert.cpp: This program shows how the toupper and tolower functions can be applied in a C++ program include include include using namespace std; int main() { int week, total, dollars; float average; char choice; cout << showpoint << fixed << setprecision(2);

Exercise 1.

The American Equities investment company offers a wide range of investment opportunities ranging from mutual funds to bonds. Investors can check the val- ue of their portfolio from the American Equities’ web page. Information about personal portfolios is protected via encryption and can only be accessed using a password. The American Equities company requires that a password consist of 8 characters, 5 of which must be letters and the other 3 digits. The letters and dig- its can be arranged in any order. For example,

rt56AA7q 123actyN 1Lo0Dwa9 myNUM741

are all valid passwords. However, the following are all invalid:

the476NEw It contains more than 8 characters (also more than 5 letters) be68moon It contains less than 3 digits. $retrn99 It contains only 2 digits and has an invalid character (‘$’)

American Equities needs a program for their web page that determines whether or not an entered password is valid. The program american_equities.cpp *”code pasted below”* from the Lab 10 folder performs this task.

Exercise 1: Fill in the code in bold and then run the program several times with both valid and invalid passwords. Read through the program and make sure you understand the logic of the code. Exercise 2: Alter the program so that a valid password consists of 10 charac- ters, 6 of which must be digits and the other 4 letters.

Exercise 3: Adjust your program from Exercise 2 so that only lower case letters are allowed for valid passwords.

american_equities.cpp:

This program tests a password for the American Equities web page to see if the format is correct

Place Your Name Here

  1. include <iostream>
  2. include <cctype>
  3. include <cstring>

using namespace std;

function prototypes

bool testPassWord(char[]); int countLetters(char*); int countDigits(char*);

int main() { char passWord[20];

cout << “Enter a password consisting of exactly 5 ” << “letters and 3 digits:” << endl; cin.getline(passWord,20);

if (testPassWord(passWord)) cout << “Please wait – your password is being verified” << endl; else { cout << “Invalid password. Please enter a password ” << “with exactly 5 letters and 3 digits” << endl; cout << “For example, my37RuN9 is valid” << endl; }

FILL IN THE CODE THAT WILL CALL countLetters and countDigits and will print to the screen both the number of letters and digits contained in the password.

return 0; }

testPassWord task: determines if the word contained in the character array passed to it, contains exactly 5 letters and 3 digits. data in: a word contained in a character array data returned: true if the word contains 5 letters & 3 digits, false otherwise bool testPassWord(char custPass[]) { int numLetters, numDigits, length;

length = strlen(custPass); numLetters = countLetters(custPass); numDigits = countDigits(custPass); if (numLetters == 5 && numDigits == 3 && length == 8 ) return true; else return false; }

the next 2 functions are from Sample Program 10.5 countLetters task: counts the number of letters (both capital and lower case in the string data in: a string data returned: the number of letters in the string int countLetters(char *strPtr) { int occurs = 0;

while(*strPtr != ‘\0’)

{ if (isalpha(*strPtr)) occurs++; strPtr++; }

return occurs; }

countDigits task: counts the number of digitts in the string data in: a string data returned: the number of digits in the string int countDigits(char *strPtr) this function counts the number of digits { int occurs = 0;

while(*strPtr != ‘\0’) { if (isdigit(*strPtr)) isdigit determines if the character is a digit occurs++; strPtr++; }

return occurs; }

Exercise 2.

Bring in case_convert.cpp “code is below” from the Lab 10 folder. Note that this is Sample Program 10.2.

Exercise 1: Run the program several times with various inputs. Exercise 2: Notice the following do-while loop which appears near the end of the program:

do {

} while(toupper(choice) != ‘Y’ && toupper(choice) != ‘N’);

How would the execution of the program be different if we removed this loop? Try removing the loop but leave the following lines in the program:

cout << “Would you like to find the average for another month?”; cout << endl << “Enter Y or N” << endl; cin >> choice;

Record what happens when you run the new version of the program using comments in the .cpp file.

Exercise 3: Alter program case_convert.cpp so that it performs the same task but uses tolower rather than toupper.

case_convert.cpp:

This program shows how the toupper and tolower functions can be applied in a C++ program

  1. include <iostream>
  2. include <cctype>
  3. include <iomanip> using namespace std;

int main() { int week, total, dollars; float average; char choice;

cout << showpoint << fixed << setprecision(2);

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