Flow of Control in Software

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Flow of Control
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But this mistake will create an infinite loop Because the value of x goes from 11 to 13, the value of x is never equal to 12; thus, the loop will never terminate This sort of problem is common when loops are terminated by checking a numeric quantity using
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== or != When dealing with numbers, it is always safer to test for passing a value For example, the following will work fine as the first line of our while loop: while (x < 12)
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With this change, x can be initialized to any number and the loop will still terminate A program that is in an infinite loop will run forever unless some external force stops it Since you can now write programs that contain an infinite loop, it is a good idea to learn how to force a program to terminate The method for forcing a program to stop varies from system to system The keystrokes Control-C will terminate a program on many systems (To type Control-C, hold down the Control key while pressing the C key) In simple programs, an infinite loop is almost always an error However, some programs are intentionally written to run forever (in principle), such as the main outer loop in an airline reservation program, which just keeps asking for more reservations until you shut down the computer (or otherwise terminate the program in an atypical way)
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Self-Test Exercises
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27 What is the output of the following (when embedded in a complete program)
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for (int count = 1; count < 5; count++) cout << (2 * count) << " ";
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28 What is the output of the following (when embedded in a complete program)
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for (int n = 10; n > 0; n = n - 2) { cout << "Hello "; cout << n << endl; }
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29 What is the output of the following (when embedded in a complete program)
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for (double sample = 2; sample > 0; sample = sample - 05) cout << sample << " ";
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30 Rewrite the following loops as for loops
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int i = 1; while(i <= 10) {
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Loops
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if (i < 5 && i != 2) cout << X ; i++; }
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int i = 1; while(i <=10) { cout << X ; i = i + 3; }
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long n = 100; do { cout << X ; n = n + 100; } while(n < 1000);
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31 What is the output of this loop Identify the connection between the value of n and the value of the variable log
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int n = 1024; int log = 0; for (int i = 1; i < n; i = i * 2) log++; cout << n << " " << log << endl;
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32 What is the output of this loop Comment on the code (This is not the same as the previous exercise)
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int n = 1024; int log = 0; for (int i = 1; i < n; i = i * 2); log++; cout << n << " " << log << endl;
33 What is the output of this loop Comment on the code (This is not the same as either of the two previous exercises)
int n = 1024; int log = 0; for (int i = 0; i < n; i = i * 2); log++; cout << n << " " << log << endl;
Flow of Control
34 For each of the following situations, tell which type of loop (while, do-while, or for) would work best a Summing a series, such as 1/2 + 1/3 + 1/4 + 1/5 + + 1/10 b Reading in the list of exam scores for one student c Reading in the number of days of sick leave taken by employees in a department d Testing a function to see how it performs for different values of its arguments 35 What is the output produced by the following (x is of type int)
int x = 10; while (x > 0) { cout << x << endl; x = x + 3; }