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The goto is C# s unconditional jump statement When encountered, program flow jumps to the location specified by the goto The statement fell out of favor with programmers many years ago because it encouraged the creation of spaghetti code However, the goto is still occasionally and sometimes effectively used This book will not make a judgment regarding its validity as a form of program control It should be stated, however, that there are no programming situations that require the use of the goto statement it is not necessary for making the language complete Rather, goto is a convenience that, if used wisely, can be a benefit in certain programming situations As such, the goto is not used in this book outside of this section The chief concern most programmers have about the goto is its tendency to clutter a program and render it nearly unreadable However, there are times when the use of the goto can clarify program flow rather than confuse it The goto requires a label for operation A label is a valid C# identifier followed by a colon The label must be in the same method as the goto that uses it and within scope For example, a loop from 1 to 100 could be written using a goto and a label, as shown here:

x = 1; loop1: x++; if(x < 100) goto loop1;

Part I:

6 0 6 0 6

The goto can also be used to jump to a case or default statement within a switch Technically, the case and default statements of a switch are labels Thus, they can be targets of a goto However, the goto statement must be executed from within the switch That is, you cannot use the goto to jump into a switch statement Here is an example that illustrates goto with a switch:

In other words, who s dependent on the other person for substance Is Tom nothing without Julia or is Julia nothing without Tom 3 Kyu-Ja said Linda What time is the train expected to arrive

// Use goto with a switch using System; class SwitchGoto { static void Main() { for(int i=1; i < 5; i++) { switch(i) { case 1: ConsoleWriteLine("In goto case 3; case 2: ConsoleWriteLine("In goto case 1; case 3: ConsoleWriteLine("In goto default; default: ConsoleWriteLine("In break; } ConsoleWriteLine(); } // } } goto case 1; // Error! Can't jump into a switch

case 1");

Let f ( x) = x/2 sin x on the interval [ 2, 5] Compare the average value of this function on the interval with its minimum and maximum

case 2");

case 3");

default");

The output from the program is shown here:

Thus the critical points occur when cos x = 1/2, or at /3, /3 We also must consider the endpoints 2, 5 The values at these points are f ( 2) = 1 + sin 2 00907 1 + 03424262 6 2

5:

Inside the switch, notice how the goto is used to jump to other case statements or the default statement Furthermore, notice that the case statements do not end with a break Since the goto prevents one case from falling through to the next, the no fall-through rule is not violated, and there is no need for a break statement As explained, it is not possible to use the goto to jump into a switch If you remove the comment symbols from the start of this line

Kyu-Ja, said Linda What time is the train expected to arrive Kyu-Ja said, Linda! What time is the train expected to arrive

the program will not compile Frankly, using a goto with a switch can be useful in some special-case situations, but it is not recommended style in general One good use for the goto is to exit from a deeply nested routine Here is a simple example:

f ( /3) = f ( /3) f ( 5) = =

// Demonstrate the goto using System; class Use_goto { static void Main() { int i=0, j=0, k=0; for(i=0; i < 10; i++) { for(j=0; j < 10; j++ ) { for(k=0; k < 10; k++) { ConsoleWriteLine("i, j, k: " + i + " " + j + " " + k); if(k == 3) goto stop; } } } stop: ConsoleWriteLine("Stopped! i, j, k: " + i + ", " + j + " " + k); } }

The output from the program is shown here:

i, j, k: i, j, k: i, j, k: i, j, k: Stopped! 0 0 0 0 0 1 0 0 2 0 0 3 i, j, k: 0, 0 3

Eliminating the goto would force the use of three if and break statements In this case, the goto simplifies the code While this is a contrived example used for illustration, you can probably imagine situations in which a goto might be beneficial One last point: Although you can jump out of a block (as the preceding example shows), you can t use the goto to jump into a block

Plainly, the maximum value is f ( 5) = 5/2 sin 5 3458924 The minimum value is f ( /3) 03424262 The average value of our function is = 1 5 ( 2)