1 reply to this topic

[bgardner]

I'm independently reading the book "Programming Principles and Practice Using C++" and I have a question for you all. I'm in chapter 4 of the book currently and have successfully done the drills, minus one part. It's actually in step 1 of the drill. Step 1 states

Quote

1. ,"Write a program that consists of a while-loop that (each time around the
loop) reads in two ints and then prints them. Exit the program when a
terminating "|" is entered.

now the code starts out with

int val1=0;

int val2=0;


while(cin>>val1>>val2){


[INDENT]//code here[/INDENT]

}

sorry i didn't put everything, I just wanted to abbreviate it and make it short just to give an idea of how it goes. Thing is, when reading in integers and doubles, the program ends simply with anything thats NOT a number. So how would I exit a while-loop such as that with only the "|" character??

Maybe thats a dumb question but i'm just kind of not seeing the answer.

[chili5]

Try this:

while(true){
  char c = cin.peek();
  if (c == '|') break;
  int val1, val2;
  cin >> val1 >> val2;
   // code here
}

The idea is look at the next character in the input stream and if it is | then terminate the loop. Otherwise, read two ints and do something with them. Didn't test it but it should work.