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The general form of the return statement is return expression; The expression is present only if the function is declared as returning a value In this case, the value of expression will become the return value of the function You can use as many return statements as you like within a function However, the function will stop executing as soon as it encounters the first return The } that ends a function also causes the function to return It is the same as a return without any specified value If this occurs within a nonvoid function, then the return value of the function is undefined A function declared as void cannot contain a return statement that specifies a value Since a void function has no return value, it makes sense that no return statement within a void function can return a value See 6 for more information on return The goto Statement Since 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 Nevertheless, although the goto statement fell out of favor some years ago, it occasionally has it uses 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 The general form of the goto statement is goto label; label: where label is any valid label either before or after goto For example, you could create a loop from 1 to 100 using the goto and a label, as shown here:
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x = 1; loop1: x++; if(x <= 100) goto loop1;
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The break Statement The break statement has two uses You can use it to terminate a case in the switch statement (covered in the section on switch earlier in this chapter) You can also use it to force immediate termination of a loop, bypassing the normal loop conditional test When the break statement is encountered inside a loop, the loop is immediately terminated, and program control resumes at the next statement following the loop For example,
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#include <stdioh> int main (void) { int t; for(t=0; t < 100; t++) { printf(''%d ", t); if(t == 10) break; } return 0; }
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prints the numbers 0 through 10 on the screen Then the loop terminates because break causes immediate exit from the loop, overriding the conditional test t<100 Programmers often use the break statement in loops in which a special condition can cause immediate termination For example, here a keypress can stop the execution of the look_up( ) function:
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void look_up(char *name) { do { /* look up names */ if(kbhit()) break; } while(!found); /* process match */ }
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The kbhit( ) function returns 0 if you do not press a key Otherwise, it returns a nonzero value Because of the wide differences between computing environments, Standard C does not define kbhit( ), but you will almost certainly have it (or one with a slightly different name) supplied with your compiler
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A break causes an exit from only the innermost loop For example,
for(t=0; t < 100; ++t) { count = 1; for(;;) { printf(''%d ", count); count++; if(count == 10) break; } }
prints the numbers 1 through 9 on the screen 100 times Each time the compiler encounters break, control is passed back to the outer for loop A break used in a switch statement will affect only that switch It does not affect any loop the switch happens to be in The exit( ) Function Although exit( ) is not a program control statement, a short digression that discusses it is in order at this time Just as you can break out of a loop, you can break out of a program by using the standard library function exit( ) This function causes immediate termination of the entire program, forcing a return to the operating system In effect, the exit( ) function acts as if it were breaking out of the entire program The general form of the exit( ) function is void exit(int return_code); The value of return_code is returned to the calling process, which is usually the operating system Zero is commonly used as a return code to indicate normal program termination Other arguments are used to indicate some sort of error You can also use the macros EXIT_SUCCESS and EXIT_FAILURE for return_code The exit( ) function requires the header <stdlibh> Programmers frequently use exit( ) when a mandatory condition for program execution is not satisfied For example, imagine a virtual-reality computer game that requires a special graphics adapter The main( ) function of this game might look like this,
#include <stdlibh> int main(void) { if(!virtual_graphics()) exit(1); play();
Page 91 /* */ } /* */
where virtual_graphics( ) is some function that returns true if the virtual-reality graphics adapter is present If the adapter is not in the system, virtual_graphics( ) 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:
void menu(void) { char ch; printf("1 Check Spelling\n"); printf(''2 Correct Spelling Errors\n"); printf("3 Display Spelling Errors\n"); printf("4 Quit\n"); printf(" Enter your choice: "); do { ch = getchar(); /* 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'); }
The continue Statement 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,
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