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Newbie C++ Help

post #1 of 15
Thread Starter 
Alrighty, so I'm taking my first class in C++. It's fun, but it's got me a bit stumped right now.

Basically, I'm making a program that will scramble a 4 letter word, keeping the first letter the same. However, I want the loop to wait for the user to press enter, and then loop, or quit when 'q' is typed.

There are a couple rules to this assignment:
-I can't use global variables
-I have to use an array, no strings
-Probably shouldn't use any outside the scope of what we've learned already, which is pretty basic I/O functions from the iostream package in the std namespace.

Basically, what I'm thinking is something along the lines of this:
Code:
char quit;
quit = 0; //Beginning value.

while(quit != 'q'){
   *word scramble code here*;

   cin >> quit;
   cin.ignore(100,'\n'); //To clear the input buffer for next loop.
}

I can get the program to quit just fine when I press 'q' then enter, but I can't get the program to continue otherwise. Every time I press enter it just brings the cursor down. However, if I type any other character than 'q', and then press enter, the loop goes again just fine.

I understand what's happening, it's just a line return, but why isn't the input buffer taking it as a blank entry? Is there a way to make it so that input buffer records the '\n' as opposed to simply acting on it?
Edited by SectorNine50 - 10/17/11 at 1:54pm
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post #2 of 15
are you saying that pressing enter breaks you out of the while loop?

cin automatically ignores newline characters so it will never be stored in quit. if you want to record the whitespace, you can use getline. there's a nice article here if you want to read up on the differences between cin and getline.
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post #3 of 15
Thread Starter 
I ended up just prompting the user to type 'n' and press enter to see the next scramble, however I'm still curious if there is a way to accomplish what I was trying to do. I wanted to submit the assignment, since that portion of it wasn't part of the grade anyway.

How can I continue a loop on enter, or quit a loop on key press 'q'?
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post #4 of 15
*delete*
Edited by surfbumb - 10/17/11 at 3:45pm
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post #5 of 15
Code:
char quit;
quit = 0; //Beginning value.

while(quit != 'q'){
   *word scramble code here*;

   //cin >> quit;
   getline(cin, quit);
   cin.ignore(100,'\n'); //To clear the input buffer for next loop.
}

Edited by FiX - 10/17/11 at 3:44pm
    
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post #6 of 15
Thread Starter 
Looks like we posted at the same time.

Ahhh getline was exactly what I was looking for! It's funny, but now that you show me that, I vaguely remember it being mentioned in class. I'm not sure she expected us to use it just yet though.

Thanks for the article!
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post #7 of 15
Just remembered you dont need to #include because your using a char, not a string smile.gif
    
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post #8 of 15
i did this real quick...test it for me.
Code:
#include <iostream>

using namespace std;

int main(){

char quit;
char word [100];
char scrambled_word [100];

cout << "Enter a word to be scrambled: ";
cin >> word;
int length = strlen(word);

for(int j = 0; j < strlen(word); ++j)
scrambled_word[j] = word[j];

scrambled_word[length] = '\0';
word[length] = '\0';

for(int i = 1; i < strlen(word); ++i) {
   
if(i == strlen(word) - 1)
break;

char holder = word[i];
char holder2 = word[length - 1];

   scrambled_word[i] = holder2;
   scrambled_word[length - 1] = holder;

   cout << "Hit 'q' to quit, or 'c' to continue program: ";
   cin >> quit;
   
   if(quit == 'q')
   break;
   cout << "Program continued...word being scrambled!" << endl;
   --length;
}
cout << "------------Scrambling complete---------------" << endl;
cout << "Original word is: " << word << endl;
cout << "Scrambled word is: " << scrambled_word << endl;
return 0;
}


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post #9 of 15
Thread Starter 
Whoa, this thread got bombarded hit all at once! smile.gif

Thanks you guys, +rep.

surfbomb, I'm looking at your program there, and it might be a bit over my head at this point. Does strlen(word) set the length of the string? Or is that just a way to get a value of the size of the array?

EDIT:
Testing it, one moment.
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post #10 of 15
Quote:
Originally Posted by SectorNine50;15346430 
Whoa, this thread got bombarded hit all at once! smile.gif

Thanks you guys, +rep.

surfbomb, I'm looking at your program there, and it might be a bit over my head at this point. Does strlen(word) set the length of the string? Or is that just a way to get a value of the size of the array?

EDIT:
Testing it, one moment.

strlen simply returns the length of the char array...so the word "red" will return 3. If you have questions on it let me know.

I'm simpling swapping like this:

river -> rrvei

rrvei -> rrevi
Edited by surfbumb - 10/17/11 at 3:54pm
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