Programming with Visual C++: Concepts and Projects Chapter 3B: Integral Data (Tutorial)

Programming with Visual C++: Concepts and Projects

Chapter 3B: Integral Data (Tutorial)

Tutorial: Binary Conversion Program

• Problem Analysis– Construct a program that allows the user to enter

a character and see its decimal (base-10) and binary (base-2) representations

– For example, if the user entered the letter ‘A’• Its binary representation 01000001 is displayed• Its decimal representation 65 is displayed

Programming with Visual C++: Concepts and Projects 2

Problem Analysis


Problem Analysis (continued)

• The ASCII code of the letter is a base-10 integer – no explicit conversion required!

• To calculate the binary representation:– Start with largest binary place value (128)– Determine how many whole times the place value

goes into the integer in question (using integer division)

– Display result– Capture remainder (using mod)










Design

• Interface sketch requires numerous textboxes– Data entry (txtChar)– Data output• Eight textboxes for the binary digits• One textbox (txtDec) for the decimal version

• Control table• Data table• Algorithm for the button (btnConvert)


Design (continued)


Design (continued)


Design (continued)


• Variables required– The character entered by the user in txtChar– The integer corresponding to that character (used

to produce the binary representation)

Design (continued)


• The starting point for this solution is a high-level algorithm

• Step 3 needs much more development

Design (continued)


• Low-level algorithm for Step 3

Design (continued)


Development

• Create the interface– Create, resize and position multiple textboxes– Set MaxLength property to 1 for txtChar– Set horizontal spacing– Add labels– Change ForeColor and BackColor– Assign names to match interface design– Add a textbox for instructions (txtInstruct)


Development (continued)


• Create interface with textBox1 and label1

• Set textBox1 properties– Change the size to 42, 62– Change the Font to Microsoft Sans Serif 16Change

the MaxLength property of textBox1 to 1 so that the user can only enter 1 character into it







• Create 8 more textboxes– Select them all using the Ctrl key– Change the sizes to 42, 62– Change the Font to Microsoft Sans Serif 16– Decrease the horizontal spacing– Change BackColor color to Black and ForeColor to

LimeGreen











• Rename all textBoxes– txtChar– txt128, txt64, txt32, txt16, txt8, txt4, txt2, txt1

• Add additional controls and set properties




• Code Form1_Load() event handler– Put 0’s in all binary digit textBoxes– Put “ “ in txtChar– Put instructions in txtInstruct







• Code btnConvert_Click()– Assign first character in txtChar to variable



• Code btnConvert_Click()– Assign character to an integer variable

– Display the base-10 integer



• Code btnConvert_Click()– Display groups of 128

– Calculate remainder



• Code btnConvert_Click()– Display other place values




Testing

• Demonstrate that your program works with:– A-Z characters– a-z characters– 0-9 numerals– Punctuation marks and special characters

• Use the ASCII table in Appendix B to verify correctness


Testing (continued)


On Your Own

• Demonstrate your understanding– Create a diagram like Figure 3-28 to show how

your program works with various decimal numbers

– Replace ToString() with Convert::ToString()

– Use shorthand operators• /=• %=


Programming with Visual C++: Concepts and Projects Chapter 3B: Integral Data (Tutorial)

Documents

visual c

binary base

decimal base

largest binary place

txtcharthe integer

explicit conversion

projectsdesigninterface

backcolorassign names