Letting the Program Do the Math Arithmetic Operators in Java

Reader Data Matrix ECC200 in Java Letting the Program Do the Math Arithmetic Operators

CHAPTER 5 Letting the Program Do the Math Arithmetic Operators
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9 Using the Properties window, change the Name property of the button on the left to btnCalculate and its Text property to Calculate Similarly, change the Name property of the button on the right to btnClear and its Text property to Clear 10 Create an event procedure stub for the Click event of btnCalculate and write the following code (to be explained in the following section, The Algorithm ) inside the event procedure:
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Private Sub btnCalculate_Click(ByVal sender As Object, _ ByVal e As SystemEventArgs) Handles btnCalculateClick Dim intLeftover As Integer intLeftover = IntegerParse(txtPenniesText) lblDollarsText = (intLeftover \ 100)ToString intLeftover = intLeftover Mod 100 lblQuartersText = (intLeftover \ 25)ToString intLeftover = intLeftover Mod 25 lblDimesText = (intLeftover \ 10)ToString intLeftover = intLeftover Mod 10 lblNickelsText = (intLeftover \ 5)ToString intLeftover = intLeftover Mod 5 lblPenniesText = intLeftoverToString End Sub
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11 Create an event procedure stub for the Click event of btnClear and write the following code inside the event procedure:
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Private Sub btnClear_Click(ByVal sender As Object, _ ByVal e As SystemEventArgs) Handles btnClearClick txtPenniesText = "" lblDollarsText = "" lblQuartersText = "" lblDimesText = "" lblNickelsText = "" lblPenniesText = "" End Sub
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This code simply resets the Text properties of the TextBox and the Label controls on the right to blank, as they were when the application rst started The result is shown in Figure 5-3
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Visual Basic 2005 Demysti ed
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Figure 5-3
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Form at run time after the Clear button has been clicked
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The Algorithm
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As you learned in 1, the purpose of Visual Basic 2005, and indeed programming languages generally, is to enable you, as the programmer, to give instructions to the computer to carry out Before you can formulate those instructions in code, you first need to be able to articulate those instructions in English or whatever other language you think in To write the Change Machine project, you need to come up with a step-by-step logical procedure to convert the pile of pennies into neater stacks of dollars, quarters, dimes, nickels, and pennies A step-by-step logical procedure for solving a problem is called an algorithm, pronounced Al Gore rhythm One algorithm for converting the pile of pennies into dollars, quarters, dimes, nickels, and pennies is to first determine how many stacks of one hundred pennies you can make from the pile Each stack of one hundred pennies would then represent one dollar You then would work with the number of pennies left over to determine the number of quarters, dimes, nickels, and, finally, pennies For example, assume there are 392 pennies in the pile You might use the following steps to determine the number of dollars, quarters, dimes, nickels, and pennies in 392 pennies: There are 100 pennies in a dollar You can make three stacks of 100 pennies from 392 pennies That means there are three dollars, with 92 pennies left over, from which you will determine the number of quarters, dimes, nickels, and pennies
CHAPTER 5 Letting the Program Do the Math Arithmetic Operators
There are 25 pennies in a quarter You can make three stacks of 25 pennies from 92 pennies That means there are three quarters, with 17 pennies left over, from which you will determine the number of dimes, nickels, and pennies There are ten pennies in a dime You can make one stack of ten pennies from 17 pennies That means there is one dime, with seven pennies left over, from which you will determine the number of nickels and pennies There are five pennies in a nickel You can make one stack of five pennies from seven pennies That means there is one nickel, with two pennies left over, which is the number of pennies Let s now convert this algorithm from English to code The first step is to store the number of pennies entered by the user in the TextBox control txtPennies into the Integer variable intLeftover The following code does this, first using the Parse method of the Integer class (discussed in the earlier section The Parse and ToString Methods ) to convert the string representation of an integer (the Text property of txtPennies) to the actual integer value before that value is assigned to the Integer variable (intLeftover):
intLeftover = IntegerParse(txtPenniesText)
When you divide the number of pennies (stored in intLeftover) by 100 (the number of pennies in a dollar), the quotient is the number of dollars in the pennies, and the remainder is the number of pennies left over Integer division provides you with the quotient but no remainder, and the Mod operator provides you with the remainder:
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