C++, Creating Math Funtions For This Weeks Program

LoSTimberWolf · Post by **LoSTimberWolf** » Tue Feb 25, 2003 2:32 pm

Ok, even though I have not written the last two functions (multiplication and divition), I am trying to get the bugs worked out. I currently have seven problems trying to compile: (43) : error C2653: 'NumDays' : is not a class or namespace name (45) : error C2065: 'hours' : undeclared identifier (47) : error C2065: 'days' : undeclared identifier (59) : error C2653: 'NumDays' : is not a class or namespace name (59) : error C2146: syntax error : missing ';' before identifier '+' (59) : error C2501: 'NumDays' : missing storage-class or type specifiers (59) : fatal error C1004: unexpected end of file found Error executing cl.exe. Here is the file I am creating: #ifndef NUMDAYS_H #define NUMDAYS_H #include <iostream.h> #include <stdlib.h> #include <math.h> #include "numdays.h" class NumDays { &nbsp &nbsp &nbsp &nbsp private: &nbsp &nbsp &nbsp &nbsp double hours; &nbsp &nbsp &nbsp &nbsp double days; &nbsp &nbsp &nbsp &nbsp void calcDays (); &nbsp &nbsp &nbsp &nbsp public: &nbsp &nbsp &nbsp &nbsp //Constructors &nbsp &nbsp &nbsp &nbsp NumDays() {hours = 0; days = 0;} &nbsp &nbsp &nbsp &nbsp NumDays(double _hours) {hours = _hours; calcDays();} &nbsp &nbsp &nbsp &nbsp //get Function &nbsp &nbsp &nbsp &nbsp double getDays() {return days;} &nbsp &nbsp &nbsp &nbsp //Addition and Subtraction &nbsp &nbsp &nbsp &nbsp NumDays operator+(const NumDays &); &nbsp &nbsp &nbsp &nbsp NumDays operator-(const NumDays &); &nbsp &nbsp &nbsp &nbsp //Equal to and Not equal to &nbsp &nbsp &nbsp &nbsp int operator==(const NumDays &); &nbsp &nbsp &nbsp &nbsp int operator!=(const NumDays &); &nbsp &nbsp &nbsp &nbsp //Greater than and Less than &nbsp &nbsp &nbsp &nbsp int operator>(const NumDays &); &nbsp &nbsp &nbsp &nbsp int operator<(const NumDays &); &nbsp &nbsp &nbsp &nbsp //Greater than or equal to and Less than or equal to &nbsp &nbsp &nbsp &nbsp int operator>=(const NumDays &); &nbsp &nbsp &nbsp &nbsp int operator<=(const NumDays &); &nbsp &nbsp &nbsp &nbsp //Increments and Decrements &nbsp &nbsp &nbsp &nbsp NumDays operator++(); &nbsp &nbsp &nbsp &nbsp NumDays operator++(double); &nbsp &nbsp &nbsp &nbsp NumDays operator--(); &nbsp &nbsp &nbsp &nbsp NumDays operator--(double); &nbsp &nbsp &nbsp &nbsp //Times and Divide &nbsp &nbsp &nbsp &nbsp NumDays operator*(double); &nbsp &nbsp &nbsp &nbsp NumDays operator/(double); }; #endif /*****************************************************************/ void NumDays::calcDays() { &nbsp &nbsp &nbsp &nbsp if (hours >= <img src=http://www.ezboard.com/images/emoticons/glasses.gif ALT="8)"> &nbsp &nbsp &nbsp &nbsp { &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp days += (hours / <img src=http://www.ezboard.com/images/emoticons/glasses.gif ALT="8)"> ; &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp hours = hours % 8; &nbsp &nbsp &nbsp &nbsp } &nbsp &nbsp &nbsp &nbsp else if (hours < 0) &nbsp &nbsp &nbsp &nbsp { &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp days -= ((abs(hours) / <img src=http://www.ezboard.com/images/emoticons/glasses.gif ALT="8)"> + 1); &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp hours = 8 - (abs(hours) % <img src=http://www.ezboard.com/images/emoticons/glasses.gif ALT="8)"> ; &nbsp &nbsp &nbsp &nbsp } }; /*****************************************************************/ NumDays NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator+(const NumDays &right) { &nbsp &nbsp &nbsp &nbsp NumDays temp; &nbsp &nbsp &nbsp &nbsp temp.hours = hours + right.hours; &nbsp &nbsp &nbsp &nbsp temp.days = days + right.days; &nbsp &nbsp &nbsp &nbsp temp.calcDays(); &nbsp &nbsp &nbsp &nbsp return temp; }; /*****************************************************************/ NumDays NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator-(const NumDays &right) { &nbsp &nbsp &nbsp &nbsp NumDays temp; &nbsp &nbsp &nbsp &nbsp temp.hours = hours - right.hours; &nbsp &nbsp &nbsp &nbsp temp.days = days - right.days; &nbsp &nbsp &nbsp &nbsp temp.calcDays(); &nbsp &nbsp &nbsp &nbsp return temp; }; /*****************************************************************/ int NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator==(const NumDays &right) { &nbsp &nbsp &nbsp &nbsp if (days == right.days && hours == right.hours) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 0; }; /*****************************************************************/ int NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator!=(const NumDays &right) { &nbsp &nbsp &nbsp &nbsp if (days != right.days && hours != right.hours) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 0; }; /*****************************************************************/ int NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator>(const NumDays &right) { &nbsp &nbsp &nbsp &nbsp if (days > right.days) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else if (days == right.days && hours > right.hours) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 0; }; /*****************************************************************/ int NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator<(const NumDays &right) { &nbsp &nbsp &nbsp &nbsp if (days < right.days) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else if (days == right.days && hours < right.hours) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 0; }; /*****************************************************************/ int NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator>=(const NumDays &right) { &nbsp &nbsp &nbsp &nbsp if (days >= right.days) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else if (days == right.days && hours > right.hours) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 0; }; /*****************************************************************/ int NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator<=(const NumDays &right) { &nbsp &nbsp &nbsp &nbsp if (days <= right.days) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else if (days == right.days && hours < right.hours) &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 1; &nbsp &nbsp &nbsp &nbsp else &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp return 0; }; /*****************************************************************/ NumDays NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator++() { &nbsp &nbsp &nbsp &nbsp ++hours; &nbsp &nbsp &nbsp &nbsp calcDays(); &nbsp &nbsp &nbsp &nbsp return *this; }; /*****************************************************************/ NumDays NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator++(double) { &nbsp &nbsp &nbsp &nbsp NumDays temp; &nbsp &nbsp &nbsp &nbsp hours++; &nbsp &nbsp &nbsp &nbsp calcDays(); &nbsp &nbsp &nbsp &nbsp return temp; }; /*****************************************************************/ NumDays NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator--() { &nbsp &nbsp &nbsp &nbsp --hours; &nbsp &nbsp &nbsp &nbsp calcDays(); &nbsp &nbsp &nbsp &nbsp return *this; }; /*****************************************************************/ NumDays NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator--(double) { &nbsp &nbsp &nbsp &nbsp NumDays temp(hours, days); &nbsp &nbsp &nbsp &nbsp hours--; &nbsp &nbsp &nbsp &nbsp calcDays(); &nbsp &nbsp &nbsp &nbsp return temp; }; /*****************************************************************/ NumDays NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator*(double) { }; /*****************************************************************/ NumDays NumDays:<img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"> perator/(double) { }; /*****************************************************************/ The main file was given to us by the teacher: #include <iostream.h> #include "numdays.h" void main() { &nbsp &nbsp &nbsp &nbsp NumDays one(25),two(15),three,four; &nbsp &nbsp &nbsp &nbsp NumDays five(12),six(1<img src=http://www.ezboard.com/images/emoticons/glasses.gif ALT="8)"> ,seven(1<img src=http://www.ezboard.com/images/emoticons/glasses.gif ALT="8)"> ,eight(36); &nbsp &nbsp &nbsp &nbsp NumDays nine; &nbsp &nbsp &nbsp &nbsp cout << "One: " << one.getDays() << endl; &nbsp &nbsp &nbsp &nbsp cout << "Two: " << two.getDays() << endl; &nbsp &nbsp &nbsp &nbsp three = one + two; &nbsp &nbsp &nbsp &nbsp cout << "Three = one + two: " << three.getDays() << endl; &nbsp &nbsp &nbsp &nbsp three = one - two; &nbsp &nbsp &nbsp &nbsp cout << "Three = one - two: " << three.getDays() << endl; &nbsp &nbsp &nbsp &nbsp four = three++; &nbsp &nbsp &nbsp &nbsp cout << "Four = Three++: " << four.getDays() << endl; &nbsp &nbsp &nbsp &nbsp four = ++three; &nbsp &nbsp &nbsp &nbsp cout << "Four = ++Three: " << four.getDays() << endl; &nbsp &nbsp &nbsp &nbsp four = three--; &nbsp &nbsp &nbsp &nbsp cout << "Four = Three--: " << four.getDays() << endl; &nbsp &nbsp &nbsp &nbsp four = --three; &nbsp &nbsp &nbsp &nbsp cout << "Four = --Three: " << four.getDays() << endl; &nbsp &nbsp &nbsp &nbsp cout << "Five: " << five.getDays() << endl; &nbsp &nbsp &nbsp &nbsp cout << "Six: " << six.getDays() << endl; &nbsp &nbsp &nbsp &nbsp cout << "Seven: " << seven.getDays() << endl; &nbsp &nbsp &nbsp &nbsp cout << "Eight: " << eight.getDays() << endl; &nbsp &nbsp &nbsp &nbsp nine = five * six; &nbsp &nbsp &nbsp &nbsp cout << "Nine = five * six: " << nine.getDays() << endl; &nbsp &nbsp &nbsp &nbsp nine = six/eight; &nbsp &nbsp &nbsp &nbsp cout << "Nine = six/eight: " << nine.getDays() << endl; &nbsp &nbsp &nbsp &nbsp if(six == seven) cout << "Six and seven are equal" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Six and seven are not equal" << endl; &nbsp &nbsp &nbsp &nbsp if(six != seven) cout << "Six and seven are not equal" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Six and seven are equal" << endl; &nbsp &nbsp &nbsp &nbsp if(seven > five) cout << "Seven is greater than five" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Seven is not greater than five" << endl; &nbsp &nbsp &nbsp &nbsp if(five > six) cout << "Five is greater than six" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Five is not greater than six" << endl; &nbsp &nbsp &nbsp &nbsp if(seven >= five) cout << "Seven is greater than or equal to five" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Seven is not greater than or equal to five" << endl; &nbsp &nbsp &nbsp &nbsp if(six >= seven) cout << "Six is greater than or equal to seven" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Six is not greater than or equal to seven" << endl; &nbsp &nbsp &nbsp &nbsp if(seven < five) cout << "Seven is less than five" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Seven is not less than five" << endl; &nbsp &nbsp &nbsp &nbsp if(five < six) cout << "Five is less than six" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Five is not less than six" << endl; &nbsp &nbsp &nbsp &nbsp if(seven <= five) cout << "Seven is less than or equal to five" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Seven is not less than or equal to five" << endl; &nbsp &nbsp &nbsp &nbsp if(six <= seven) cout << "Six is less than or equal to seven" << endl; &nbsp &nbsp &nbsp &nbsp else cout << "Six is not less than or equal to seven" << endl; } /* Correct output: One: 3.125 Two: 1.875 Three = one + two: 5 Three = one - two: 1.25 Four = Three++: 1.25 Four = ++Three: 1.5 Four = Three--: 1.5 Four = --Three: 1.25 Five: 1.5 Six: 2.25 Seven: 2.25 Eight: 4.5 Nine = five * six: 3.375 Nine = six/eight: 0.5 Six and seven are equal Six and seven are equal Seven is greater than five Five is not greater than six Seven is greater than or equal to five Six is greater than or equal to seven Seven is not less than five Five is less than six Seven is not less than or equal to five Six is less than or equal to seven Press any key to continue */ -LoS-TimberWolf{FF} Vehicle Specilist

Post by **XMEN Gambit** » Tue Feb 25, 2003 4:18 pm

I was able to change up the picture considerably by removing the line #include "numdays.h" From the file "numdays.h". Recursive inclusion is generally a no-no. Try it, you'll like it. (Even though the number of errors actually increases, it gets rid of THOSE.) <img src="http://www.xmenclan.org/xmengambit.gif"/> XMEN member Card-carrying DTM OKL Fish-napper Though a program be but three lines long, someday it will have to be maintained.  The Tao of Programming

BlackRider · Post by **BlackRider** » Tue Feb 25, 2003 5:04 pm

recursive inclusion is fun... also try recursive constructors <img src=http://www.ezboard.com/images/emoticons/smile.gif ALT=":)"> Just to be dumb, I once had a constructor that created an object of its own type... it compiled just fine, but when i ran it it never did anything but fill memory <img src=http://www.ezboard.com/images/emoticons/laugh.gif ALT=":lol"> I once had a friend that would e-mail me once a week with programs he couldn't get to compile. After something like 5 weeks of me just debugging his programs I got quite sick of it. So, this last time, instead of fixing his code for him I gave him some simple advice. 1) Until you are practiced enough to write 100+ line programs w/o a single compile, don't try it. Develope your programs bit by bit. When I was learning I started with an outside in approach. I'd start with the most basic functions/classes and wouldn't even add functionality to them until I was ready. Just build a little bit and compile and run. This drastically reduces where your errors could be. After my programs started getting far too complex for the outside in method, I'd use a modular method on top of outside in. I'd break the program down into as many parts as reasonable and then I'd work on one part at a time. Just don't tackle large projects all at once. 2) If ever you should run across a concept you don't understand, there are many good C++ books on the market. Don't get the new ones, not much has changed. I went and got me 5 books that ranged in price from $0.25 to $1.00 each. If I didn't understand a concept in one book I'd read about it in another. I works! I picked up the C++ language in a matter of hours... much less than 21 days! <img src=http://www.ezboard.com/images/emoticons/smile.gif ALT=":)"> 3) Its nice to ask friends for questions and help, but try to avoid relying on them. Crutches are nice when you can't get about without them, but if you rely on them too heavily your leg will never heal. (Sorry, I'm not too good with analogies) I don't have a problem with your asking questions and seeking help. I'm just offering some help. <img src=http://www.ezboard.com/images/emoticons/smile.gif ALT=":)"> So I hope this helps. Outside in, bit by bit... COLORS!  I LOVE EZBOARD... WAIT...

LoSTimberWolf · Post by **LoSTimberWolf** » Wed Feb 26, 2003 2:06 pm

I have gotten all but one problem from the error list worked out. The modular, %, does not like using a double and is preventing my program from compiling. Is there any way to either trick it to work or do I have to change a double into an int to work with it? -LoS-TimberWolf{FF} Vehicle Specilist

BlackRider · Post by **BlackRider** » Wed Feb 26, 2003 2:27 pm

mod only works with ints... <img src=http://www.ezboard.com/images/emoticons/frown.gif ALT=":("> COLORS!  I LOVE EZBOARD... WAIT...

XMEN Durango · Post by **XMEN Durango** » Wed Feb 26, 2003 3:14 pm

and put it in a 10X13 pan and bake for 45 min. at 350 ice when cooled <img src=http://www.contrabandent.com/cwm/s/cont ... freakB.gif ALT=":duh">

LoSTimberWolf · Post by **LoSTimberWolf** » Wed Feb 26, 2003 6:10 pm

Well, the program has been running most of today, but it has become aparrent over the past several hours that the overloaded operators are not easy to figure out exactly how the teacher got the answeres he did. So its back to the paper to figure out how to get a mathimatical equation to work in the program with signs that are changed. Its like trying to find the top of a Morbius strip, there is only one side. -LoS-TimberWolf{FF} Vehicle Specilist

FaLLGuY · Post by **FaLLGuY** » Fri Feb 28, 2003 1:03 pm

Wow! Far out dude...<img src=http://www.ezboard.com/images/emoticons/smokin.gif ALT=":smokin"> This stuff blows right over my head..<img src=http://www.ezboard.com/images/emoticons/laugh.gif ALT=":lol"> <img src="http://homepage.ntlworld.com/planetburt ...

C++, Creating Math Funtions For This Weeks Program

C++, Creating Math Funtions For This Weeks Program

Re: C++, Creating Math Funtions For This Weeks Program

Re: C++, Creating Math Funtions For This Weeks Program

Re: C++, Creating Math Funtions For This Weeks Program

Re: C++, Creating Math Funtions For This Weeks Program

Re: C++, Creating Math Funtions For This Weeks Program

Re: C++, Creating Math Funtions For This Weeks Program

Re: C++, Creating Math Funtions For This Weeks Program