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Programming Lecture #3 CS 101 Autumn 2006 Tariq Jadoon
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In Lecture #2 Variables and Assignment statements New Controls –Label –CommandButton –Textbox
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Variables & Assignment Statements A variable is a named storage space –Naming variables follows certain simple rules: [See page 19 Chapter 2 of Visual Basic Schaum’s outline] Assignment statements assign values to variables: Variable = Expression An assignment statement is NOT an equation
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1 4 Variables & Assignment Statements X = 1 X = 4 Y = X XY 4
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Processor Variables & Assignment Statements 4 X = 1 X = 4 Y = X X = Y + 2 XY 4 4 + 2 =6 6
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Today Swapping Variables Debugging Tools –Immediate Window –Single Stepping –Watch Conditional Statements
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10 Swapping the Contents of Two Variables X = 10 Y = 20 XY 20
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10 Swapping the Contents of Two Variables X = 10 Y = 20 X = Y XY 20
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10 Swapping the Contents of Two Variables X = 10 Y = 20 Y = X XY 10 20
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Swapping the Contents of Two Variables X = 10 Y = 20 Temp = Y Y = X X Y 10 20 Temp 20 10
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Swapping the Contents of Two Variables X = 10 Y = 20 Temp = Y Y = X X = Temp X Y 10 Temp 20
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Debugging Using the Immediate Window as a scratchpad Placing Breakpoints Single stepping (F8) Placing Watches
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Conditional Code VB has a number of block structures for conditional code: IF condition THEN action IF condition THEN action1 action2... END IF
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Conditional Code (contd.) IF condition THEN action1 … ELSE action2 … END IF
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