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Program Control Statements
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break; case '3': display_errors(); break; } } while(ch!='1' && ch!='2' && ch!='3'); }
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THE FOUNDATION OF C++
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In the case of a menu function, you always want it to execute at least once After the options have been displayed, the program will loop until a valid option is selected
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C/C++ has four statements that perform an unconditional branch: break, return, goto, and continue Of these, you can use return and goto anywhere inside a function You can use the break and continue statements in conjunction with any of the loop statements As discussed earlier in this chapter, you can also use break with switch The return statement is discussed in 4, when functions are described The other jump statements are discussed here
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The break statement has two uses You can use it to terminate a case in the switch statement (covered in the section on the switch, earlier in this chapter) You can also use it to force immediate termination of a loop, bypassing the normal loop conditional test This use is examined here 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( ) routine:
int look_up(char *name) { char tname[40]; int loc; loc = -1; do { loc = read_next_name(tname); if(kbhit()) break; } while(!strcmp(tname, name)); return loc; }
You might use a function like this to find a name in a database file If the search is taking a very long time and you are tired of waiting, you could strike a key and return from the function early The kbhit( ) function returns 0 if no key has been hit, and non-0 otherwise 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 program 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
3:
Program Control Statements
exit( )
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 status); It uses the <stdlibh> header The value of status 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 values indicate some sort of error You can also use the predefined macros EXIT_SUCCESS and EXIT_FAILURE as values for status 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(!special_adapter()) exit(1); play(); return 0; }
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