Thursday, 17 October 2013

Break Statement in Programming

The Break Statement 

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The break declaration cuts off the flow of command. We have glimpsed in switch declaration that when a true case is discovered, the flow of control moves through every declaration down ward. We desire that only the declarations of factual case should be performed and the remaining should be skipped. For this reason, we use the break declaration. We compose the shatter declaration after the declarations of a case. Therefore, when a factual case is found and its declarations are executed then the break declaration cuts off the flow of command and control leaps out of the witch statement. If we want to do the identical task for two cases, like in preceding demonstration for ‘A’ and ‘a’, then we don't put break statement after the first case. We write both the situations ( or the situations may be more than two) line by line then write widespread statements to be executed for these cases. We write the shatter declaration after these widespread declarations. We should use the break statement is necessary after the declarations of each case. The shatter declaration is necessary in swap structure, without it the swap structure becomes illogical.  As without it all the declaration will execute after first agree case is found.

The break statement is also used in decision structures other than switch structure. We have seen that in while, do-while and for loops, we have to violate some condition explicitly to terminate the loop before its complete repetitions. As in a program for guessing a character, we make a variable myNum greater than 5 to violate the while condition and exit the loop if the correct character is guessed before five tries. In these loops, we can use the break statement to exit a loop. When a break statement is encountered in a loop, the loop terminates immediately. The control exits the inner most loop if there are nested loops. The control passes to the statement after the loop. In the guessing character example, we want that if the character is guessed in first or second attempt, then we print the message ‘Congratulations, You guess is correct’ and exit the loop. We can do this by using a break statement with an if statement. If the character is guessed, we print the message. Afterwards, the break statement is executed and the loop terminates. So we can write this as follows.

if ( c == ‘z’ ) // c is input from user
cout << “Great, Your guess is correct” ; break;
Thus, break statement can be used to jump out of a loop very quickly.

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