coding a sentinel controlled loop

tommy69 · #1 10-Mar-2004, 04:09

This one is driving me nuts:

I need to code a loop, like a While loop and if a user types -5, the loop will will stop looping. The loop will contain statements which input and output the integers depending on what integer the user types.

If either a 2 or a 99 is typed, the integer simply won't be printed. All other integers will be printed. Once the user types in -1, the message, "End of Program" will print.

For example;

The printf statement will be like "Please enter an integer". If I type in a 8, the message displays, "The integer you have selected is 8". If I type in -5, "End of Program" is printed. If I type in 2, nothing is printed and myabe the message could go back to "Please enter in another integer" or maybe it's better to go back to the original message of "Please enter an integer". Does this make sense? I have tried to code this many and many of times without any success. Any help would greatly be appreciated. Thanks much,

Tom

pan · #2 10-Mar-2004, 07:40

Hello Tom,

>I need to code a loop, like a While loop and if a user types -5, the loop will will stop looping.

This can be done with the "break;" statement, which allows you to exit a loop you are from any point within that loop. For instance, you may use an if statement and when -5 is encountered the loop breaks. However, you may also keep looping until a -5 is encountered by diong something like this:

CPP / C++ / C Code:


int input = 0;             //declare an input
while ( input != -5 ){  //keep looping until a -5 is encountered
   cin >> input;          //get the input
}

>If either a 2 or a 99 is typed, the integer simply won't be printed.

This can be controlled through an if statement, with an AND ("&&"):

CPP / C++ / C Code:


int input = 0;
while ( input != -5 ){
     cin >> input;
     if ( input != 2 && input != 99 )
          cout << "You entered the number " << input << '\n';
}

If this information is not helpful, post what code you do have and I can get back to you.

Best of,
Pan Thomakos

tommy69 · #3 10-Mar-2004, 14:52

Thanks for the reply. You were a big help :-) 8-)

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