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Radio waves are measured in watts A radio signal transmitted at 50 megawatts travels twice the distance a 25-megawatt radio signal travels A radio signal gradually loses power the farther it travels away from the transmitter Radio engineers extend the range of transmission by using a repeater A repeater (Figure 2-7) is both a radio receiver and radio transmitter, also known as a transceiver A repeater receives a radio signal and then retransmits the signal, thereby increasing the distance the signal travels Retransmission introduces new energy to power the signal for longer distances

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nfsetMaximumFractionDigits(2); } /* User pressed Enter on a text field or pressed Compute Display the result if all fields are completed */ public void actionPerformed(ActionEvent ae) { double result = 00; String String String String amountStr periodStr rateStr = compStr = = amountTextgetText(); = periodTextgetText(); rateTextgetText(); compTextgetText();

of information Labels tell users what information to enter into each field Different field types are used to request different types of information Always make certain to clearly label each field A jump menu allows users to access multiple links from a single menu

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try { if(amountStrlength() != 0 && periodStrlength() != 0 && rateStrlength() != 0 && compStrlength() != 0) { principal = DoubleparseDouble(amountStr); numYears = DoubleparseDouble(periodStr); rateOfRet = DoubleparseDouble(rateStr) / 100; compPerYear = IntegerparseInt(compStr); result = compute(); futvalTextsetText(nfformat(result)); } showStatus(""); // erase any previous error message } catch (NumberFormatException exc) { showStatus("Invalid Data"); futvalTextsetText(""); } } // Compute the future value double compute() { double b, e; b = (1 + rateOfRet/compPerYear); e = compPerYear * numYears; return principal * Mathpow(b, e); } }

Figure 2-6

Sometimes you will want to know how large an initial investment is required to achieve some future value For example, if you are saving for your child s college education and you know that you will need $75,000 in five years, how much money do you need to invest at 7 percent to reach that goal The InitInv applet developed here can answer that question

On a separate piece of paper, sketch the graphic shown for each question below Complete the graphic and answer the questions Be ready to explain and discuss your answers

Part IV:

Figure 2-7

FIGURE 32-3

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Reading Without Distractions When you look through this chapter, you will see illustrations, tables, features, and questions Determine which are most important to the content you are reading Which can wait until later Share your list with your classmates Are their listed items the same as yours Come up with a reading strategy Determine the elements that need to be included the first time you read through a chapter

The formula to compute an initial investment is shown here: Initial Investment = targetValue / (((rateOfRet / compPerYear) + 1) compPerYear * numYears) where rateOfRet specifies the rate of return, targetValue contains the starting balance, compPerYear specifies the number of compounding periods per year, and numYears specifies the length of the investment in years If you use an annualized rate of return for rateOfRet, then the number of compounding periods is 1 The following applet called InitInv uses the preceding formula to compute the initial investment required to reach a desired future value The applet produced by this program is shown in Figure 32-3

/* Compute the initial investment necessary for a specified future value */ import javaawt*; import javaawtevent*; import javaxswing*; import javatext*; /* <applet code="InitInv" width=340 height=240> </applet> */ public class InitInv extends JApplet implements ActionListener { JTextField targetText, initialText, periodText, rateText, compText; JButton doIt; double targetValue; double rateOfRet; double numYears; int compPerYear; NumberFormat nf; // // // // original targetValue rate of return length of loan in years number of compoundings per year

These exercises reinforce the skills you learned in this chapter s You Try It activities Refer back to the You Try It activities if you need extra guidance

32:

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vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader