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THE FOUNDATION OF C++
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where special_adapter( ) is some function that returns true if the needed special adapter is present If the adapter is not in the system, special_adapter( ) returns false and the program terminates As another example, this version of menu( ) uses exit( ) to quit the program and return to the operating system:
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void menu(void) { char ch;
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Borland C++ Builder: The Complete Reference
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printf("1 printf("2 printf("3 printf("4 printf("
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Check Spelling\n"); Correct Spelling Errors\n"); Display Spelling Errors\n"); Quit\n"); Enter your choice: ");
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do { ch = getche(); /* read the selection from the keyboard */ switch(ch) { case '1': check_spelling(); break; case '2': correct_errors(); break; case '3': display_errors(); break; case '4': exit(0); /* return to OS */ } } while(ch!='1' && ch!='2' && ch!='3'); }
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The continue statement works somewhat like the break statement Instead of forcing termination, however, continue forces the next iteration of the loop to take place, skipping any code in between For example, the following routine displays only positive numbers:
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do { scanf("%d", &x); if(x < 0) continue; printf("%d ", x); } while(x != 100);
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3:
Program Control Statements
In while and do-while loops, a continue statement forces control to go directly to the conditional test and then continue the looping process In the case of the for, first the increment part of the loop is performed, then the conditional test is executed, and finally the loop continues The previous example can be changed to allow only 100 numbers to be printed, as shown here:
for(t=0; t<100; ++t) { scanf("%d", &x); if(x < 0) continue; printf("%d ", x); }
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The following example shows how you can use continue to expedite the exit from a loop by forcing the conditional test to be performed sooner:
void code(void) { char done, ch; done = 0; while(!done) { ch = getchar(); if(ch=='') { done = 1; continue; } putchar(ch+1); /* shift the alphabet one position */ } }
This function codes a message by shifting all characters you type one letter higher For example, a would become b The function will terminate when you type a period After a period has been input, no further output will occur, because the conditional test, brought into effect by continue, will find done to be true and will cause the loop to exit
Borland C++ Builder: The Complete Reference
Labels and goto
Since C/C++ has a rich set of control structures and allows additional control using break and continue, there is little need for goto Most programmers chief concern about the goto is its tendency to render programs unreadable Although the goto statement fell out of favor some years ago, it occasionally has its uses This book will not judge its validity as a form of program control While there are no programming situations that require goto, it is a convenience, which, if used wisely, can be a benefit in a narrow set of programming situations, such as jumping out of a set of deeply nested loops The goto is not used in this book outside of this section The goto statement requires a label for operation (A label is a valid identifier followed by a colon) Furthermore, the label must be in the same function as the goto that uses it you cannot jump between functions 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;
One good use for the goto is to exit from several layers of nesting For example:
for() { for() { while() { if() goto stop; } } } stop: printf("error in program\n");
Eliminating the goto would force a number of additional tests to be performed A simple break statement would not work here because it would only exit from the innermost loop
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