CIS170C Week 5 Lab Instructions

Lab 5 of 7: Strings and Pointers

Lab Overview—Scenario/Summary

You will code, build, and execute a program requiring strings and pointers.

You are developing a software package that requires users to enter their own passwords. The passwords must meet the software criteria.

• The password should be at least six characters long.
• The password should contain at least one uppercase and one lowercase letter.
• The password should have at least one digit.

Learning outcomes:

1. Be able to explain the need for strings.
2. Be able to explain the way memory is allocated for arrays in a program.
3. Be able to explain the fact that arrays are objects in C++.
4. Be able to write a program that implements strings.

Deliverales

Section Deliverable Points
Lab 5 Step 5: Program Listing and Output 30
All Steps Total 30

Lab Steps

Preparation:

If you are using the Citrix remote lab, follow the login instructions located on the lab area in Course Home.

Locate the Visual Studio icon and launch the application.
 
Step 1: Requirements
You are developing a software package that requires users to enter their own passwords. Loop until the passwords meet the software criteria.

• The password should be at least six characters long.
• The password should contain at least one uppercase and one lowercase letter.
• The password should have at least one digit.

The program should have an isValid function that will test if the password is valid. Use the following code to declare a password variable with a global constant int SIZE=80;
char password[SIZE];

Next, use a while(true) to continue looping until the user enters a valid password. Read in the password and call the isValid program. You can use the isupper(), islower(), and isdigit() functions. For example,
if (isdigit(*password))
//if this is true, you know the password has at least one digit.

Output from Program:

Password requirements:
– The password should be at least six characters long.
– The password should contain at least one uppercase
– and one lowercase letter.
– The password should have at least one digit.

Enter a password: aaaaaaa
The password was invalid.

Password requirements:
– The password should be at least six characters long.
– The password should contain at least one uppercase
– and one lowercase letter.
– The password should have at least one digit.

Enter a password: aBcdEfg
The password was invalid.

Password requirements:
– The password should be at least six characters long.
– The password should contain at least one uppercase
– and one lowercase letter.
– The password should have at least one digit.

Enter a password: abc123D
The password is valid.

Step 2: Processing Logic
Using the pseudocode below, write the code that will meet the requirements.

Declare constants SIZE and MIN
Function prototype for isValid
Main Function

Declare the password as a character array.
While true
Display the password requirements
Get password from user
Call the isValid function
Display results of isValid function

isValid function
Declare Boolean variables
Use strlen command to determine the length of the password and if it is greater than MIN, set bool value to true
Loop
Test if password has a lowercase letter
Test if password has an upperecase letter
Test if password has a digit
Go to next character (ie *password++;)
End loop
If all boolean values are true, return 1, else return 0

Step 3: Create a New Project
Create a new project and name it LAB5. Write your code using the Processing Logic in Step 2. Make sure you save your program.

Step 4: Compile and Execute
a) Compile your program. Eliminate all syntax errors.

b) Build your program and verify the results of the program. Make corrections to the program logic if necessary until the results of the program execution are what you expect.

Step 5: Print Screenshots and Program

1. Capture a screen print of your output. (Do a PRINT SCREEN, and paste into an MS Word document.)
2. Copy your code and paste it into the same MS Word document that contains the screen print of your output.
3. Save the Word document as Lab05A_LastName_FirstInitial.
END OF LAB