Thread: Re: Function problems in simple C++ prog.

  1. #1
    Registered User
    Join Date
    Nov 2001

    Unhappy Re: Function problems in simple C++ prog.

    Hey guys, I'm having a bit of trouble here. I have a really easy program using a large number of functions in one program. The program simulates a race between a hare and a tortoise and then outputs the to the screen. It *should* look something like this:

    The hare wins.

    But my output's getting screwed up. If you wanna take a crack and help me with what's wrong, I'd be quite thankful.
    The code I have so far is attached as csc141_ass4.cpp.

  2. #2
    Registered User
    Join Date
    Oct 2001

    What tha...

    Im getting :

    c:\windows\desktop\csc141_ass4.cpp(127) : fatal error C1010: unexpected end of file while looking for precompiled header directive

    That what you see to? Am I missing a file here or something?
    "Who ya gonna call?"


  3. #3
    Registered User
    Join Date
    Nov 2001
    well, to get you started, you have to update your pos_tortoise, pos_hare....this could be as simple as passing them by reference. Actually you should pass tortoise and hare, and completely drop your pos_ variables. Another thing, if you have your for loop running until count = 70, incrementing by one, your tortoise and hare could run to 210 and 420, respectively b/c it doesn't end when one of them hits 70. I would change it to a while loop along with the aforementioned changes, it might look something like this:

    // Define this as a global const, so it can be used in other functions
    const int track_len = 70;

    // Make it int, good practice and I said so
    int main() {

    int tort = 0, hare = 0, randNum;

    while(hare < track_len && tort < track_len) {
    randNum = rand()%9+1;
    move_tort(tort, randNum);
    move_hare(hare, randNum);
    display(tort, hare);

    results(tort, hare);

    return 0;

    void move_tort(int &t, int n) {
    switch( n ) {
    // A few things here, 1. you add 1 to your random number, you'll never
    // get a 0 case, 2. you don't need to repeat code as much, watch:
    case 1:
    case 2:
    case 3:
    case 4: t+= 3; break; // If your random number is 1, 2, 3, or 4, it will add
    // 3 to your tortoise position. In addition, since
    // tortoise was passed by reference, it will be
    // incremented by 3 back in main()
    // In the next set of cases, you might want to account for the position
    // being <6, which would cause a negative, ie.
    case 5:
    case 6: t>=6?t-=6:t=0; break;
    // If you don't know how t>=6?t-=6:t=0 works, you could use:
    // if(t >= 6) t-=6; else t = 0;

    case 7:
    case 8:
    case 9: t+=1; break;
    default: cout << "WHAT THE HELL IS GOING ON?\n"; break; }

    void move_hare(int &h, int n) {/*You can figure this out*/}

    // I'm sure there are flaws in this function, I was writing it as I went
    void display(int t, int h) {
    // I do this differently than you did, but that's just personal opinion

    int diff, *first, *second;
    bool tied = false;

    h =
    if(h==t) tied = true;
    first = (t > h ? t : h);
    second = (t > h ? h : t);
    diff = track_len - *first;
    if(diff < 0) diff = 0;

    for(int i = 0; i<*second && i<track_len; i++)
    cout << ".";
    if(tied) cout << "B";
    else if(h == *second) cout << "H";
    else cout << "T";

    for(int i = *second; i<*first && i<track_len; i++)
    cout << ".";
    else if(h == *first) cout << "H";
    else cout << "T";

    for(int i=0; i<diff; i++)
    cout << ".";
    Hope this is helpful.

  4. #4
    Registered User matheo917's Avatar
    Join Date
    Sep 2001

    Lightbulb i got a better one....

    check this out....

    in your directives to the preprocessor.....

    #include <iostream.h>
    #include <stdlib.h>
    #include <time.h>
    using namespace std;

    you use the old C style headers that end with (.h)
    and use the new C++ style phrease (using namespace std

    when you call on function rand() the compiler exits due to the ambiguity of the two (2) styles.....
    what i mean is that the compiler gets confused whether u are using the rand() or std::rand()

    my advice is just earase the (.h) part of your header files and put instead of just rand() ... you should put std::rand(), i think that should get rid of the fatal error which is te unexpected end of file

    i just tried it and it runs..... i didn't

    ps. hint....... by using your header file <stdlib>

    and instead of writing your pause function yourself put this


    in that place that will pause the system where ever you want and will ask you to press any key to continue....

    i hope that helps.....

    to tell you the truth .... the outcome doesn't look like what you have expected but i will leave that up to you..... look at the previous post reply.... it should help you


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