CMIS 102 Hands-On Lab **Week 7**

**Overview**

This hands-on lab allows you to follow and experiment with the critical steps of developing a program including the program description, analysis, test plan, design, and implementation with C code. The example provided uses sequential, repetition, selection statements and two user-defined function.

Program Description

This program will provide options for a user to calculate the square or cube of a positive Integer input by a user. The program will prompt the user to enter an Integer and then prompt the user if they want to calculate the square of the cube of the number. Based on the inputs of the user, the program will output the square of the cube of the positive integer. The program will then print the Integer and square or cube of the integer based on the user’s original choice. The program will continue to prompt the user for Integers and their calculation choice until the user enters a negative integer. The square and cube calculations should be calculated using a function.

Analysis

I will use sequential, selection, and repetition programming statements and functions for the cube and square calculations.

I will define three Integer numbers: IntValue, MenuSelect, Results to store the Integer value input by the user, the Menu selection (1 for Square, 2 for Cube) of the user, and the results of the Square or Cube functions.

The Square function will take one Integer as input and return one Integer as the output. The calculation within the Square function is: Results = IntValue * IntValue

For example, if 10 was entered as the IntValue. Results = 10*10 = 100

The Cube function will take one Integer as input and return one Integer as the output. The calculation within the Cube function is: Results = IntValue * IntValue*IntValue

For example, if 10 was entered as the IntValue. Results = 10*10*10 = 1000

A repetition loop can be used to loop through iterations until a negative is entered: while(intValue > 0) (

… End For

Test Plan

To verify this program is working properly the input values could be used for testing:

Test Case

Input

Expected Output

1

IntValue=10 MenuSelect=1

Square of 10 is 100

2

IntValue=10 MenuSelect=2

Cube of 10 is 1000

3

intValue=-1 MenuSelect=N/A

Program exits

Pseudocode

// This program will provide options for a user to calculate the square

// or cube of a positive Integer input by a user.

// Start Main program Main

// Declare variables

Declare intValue, menuSelect,Results as Integer

// Set intValue to positive value to start loop Set intVal = 1;

// Loop While input is a positive number While intValue > 0

Print “Enter a positive Integer:” Input intValue

// Only perform menu and function calls is integer is positive If intValue > 0 Then

Print “Enter 1 to calculate Square, 2 to Calculate Cube ” Input menuSelect

If menuSelect == 1 Then

// Call the Square Function Set Results = Square(intValue) Print intValue,Results

Else If menuSelect == 2 Then

// Call the Cube function set Results = Cube(intValue) Print intValue,Results

Else

Print “Invalid menu item, only 1 or 2 is accepted” End If

End If END While

// End of Main program End Program

// Square Function

Function Square(value) as Integer Set Square = value*value

End Function

// Cube Function

Function Cube(value) as Integer Set Cube = value*value*value

End Function

C Code

The following is the C Code that will compile in execute in the online compilers.

// C code

// This program will provide options for a user to calculate the square

// or cube of a positive Integer input by a user.

// Developer: Faculty CMIS102

// Date: Jan 31, XXXX

#include int main ()

{

/* variable definition: */

int intValue, menuSelect,Results; intValue = 1;

// While a positive number while (intValue > 0)

{

printf (“Enter a positive Integer\n: “); scanf(“%d”, &intValue);

if (intValue > 0)

{

printf (“Enter 1 to calculate Square, 2 to Calculate Cube \n: “); scanf(“%d”, &menuSelect);

if (menuSelect == 1)

{

// Call the Square Function

Results = Square(intValue);

printf(“Square of %d is %d\n”,intValue,Results);

}

else if (menuSelect == 2)

{

// Call the Cube function Results = Cube(intValue);

printf(“Cube of %d is %d\n”,intValue,Results);

}

else

printf(“Invalid menu item, only 1 or 2 is accepted\n”);

}

}

return 0;

}

/* function returning the Square of a number */ int Square(int value)

{

return value*value;

}

/* function returning the Cube of a number */ int Cube(int value)

{

return value*value*value;

}

Setting up the code and the input parameters in ideone.com:

Note the Input values for this run were: 10

1

10

2

-99

You can change these values to any valid integer values to match your test cases.

Results from running the programming at ideone.com:

Learning Exercises for you to complete

1. Using the Square and Cube functions as models, Create an application that includes a function named “Shrink” that would take an Integer and return the Integer divided by 2? (Hint: your returned value should probably be a double type.) Support your experimentation with screen captures of executing the new code.

2. Prepare a new test table with at least 3 distinct test cases listing input and expected output for the code you created after step 1.

3. What would happen if you removed the following code from our design? If intValue > 0

Support your argument with screen captures of executing the new code.

4. Modify the original code and add an additional function of your choice. The function should be unique and something you created for this assignment. Support your experimentation with screen captures of executing the new code. Prepare a test table with at least 3 distinct test cases listing input and expected output for your unique function.

Grading guidelines

** **

**Submission**

**Points**

Successfully demonstrates execution of this lab with online compiler. Includes a screen capture.

2

Modifies the code to create an application that includes a function named “Shrink” that would take an Integer and return the Integer divided by 2 Support your experimentation with screen captures of executing the new code.

2

Provides a new test table with at least 3 distinct test cases listing input and expected output for the code you created after step 1.

1

Describes what would happen if you removed the “if intValue

= 0“ line was removed. Support your argument with screen captures of executing the new code.

1

Modifies the original code and adds an additional unique function of your choice. Supports your experimentation with screen captures of executing the new code. Prepares a test table with at least 3 distinct test cases listing input and expected output for your unique function

3

Document is well-organized, and contains minimal spelling and grammatical errors.

1

**Total**

**10**