Object Oriented Programming Question

[grace]

Dear everybody…i have a problem in a program that I’m working on and it keeps giving me the same error every time I compile it…
the error is the following:
missing function header (old-style formal list?) the program is:

#include<iostream><br /> using std::cout;<br /> using std::endl;<br /> class rational{<br />              public:<br />                           rational (int=0, int=1);<br />                           rational addition (const rational &#038;);<br />                           rational subtraction (const rational &#038;);<br />                           rational multiplication (const rational &#038;);<br />                           rational division (const rational &#038;);<br />                           void printrational();<br />                           void printrationald();<br />              private:<br />                           int numerator;<br />                           int denominator;<br />                           void reduction();<br /> };<br /> <br /> rational :: rational(int n, int d)<br /> {<br /> int numerstor=n;<br /> int denominator =d;<br /> }<br /> rational rational ::addition (const rational &#038;s)<br /> {<br />              rational w;<br />              w.numerator= s.numerator*denominator;<br />              w.numerator+=s.denominator*numerator;<br />              w.denominator=s.denominator*denominator;<br />              w.reduction();<br />              return w;<br /> }<br /> rational rational:: subtraction(const rational &#038;r)<br /> {<br />              rational w;<br />              w.numerator= r.numerator*denominator;<br />              w.numerator-=r.denominator*numerator;<br />              w.denominator=r.denominator*denominator;<br />              w.reduction();<br />              return w;<br /> }<br /> rational rational ::multiplication (const rational &#038;j)<br /> {<br />              rational w;<br />              w.numerator= j.numerator*denominator;<br />              w.denominator=j.denominator*denominator;<br />              w.reduction();<br />              return w;<br /> }<br /> rational rational ::division (const rational &#038;k)<br /> {<br />              rational w;<br />              w.numerator= k.numerator*denominator;<br />              w.denominator=denominator*k.denominator;<br />              w.reduction();<br />              return w;<br /> }<br /> void rational::printrational()<br /> {<br />              cout<<numerator<<'t'<<denominator;<br /> }<br /> void rational::printrationald();<br /> {<br />              cout<<numerator'/'<<denomirator;<br /> }<br /> void rational:: reduction()<br /> {<br />              int s;<br />              s=numerator<denominator?numerator:denominator;<br />              int x=0;<br />              for (int l=2; l<=s;++l)<br />                           if (numerator % l == 0 &#038;& denominator % l)<br />                                        x= l;<br />                           if (x!= 0)<br />                           {<br />                           int         numinator = x;<br />                           int         denominator = x;<br />                           }<br /> }<br /> int main()<br /> {<br /> rational a(1, 7), f(9,2), h;<br /> a.printrational();<br /> cout<<"+";<br /> f.printrational();<br /> h= a.addition(f);<br /> cout<<"=";<br /> h.printrational();<br /> cout<<'n';<br /> h.printrational();<br /> cout<<"=";<br /> h.printrationald();<br /> a.printrational();<br /> f.printrational();<br /> h=a.subtraction(f);<br /> cout<<"=";<br /> h.printrational();<br /> cout<<'n';<br /> h.printrational();<br /> cout<<"=";<br /> h.printrationald();<br /> a.printrational();<br /> cout<<"h";<br /> f.printrational();<br /> h=a.multiplication(f);<br /> cout<<"=";<br /> h.printrational();<br /> cout<<'n';<br /> h.printrational();<br /> cout<<'=';<br /> h.printrationald();<br /> a.printrational();<br /> f.printrational();<br /> h=a.division(f);<br /> cout<<"=";<br /> h.printrational();<br /> h.printrational();<br /> cout<<"=";<br /> h.printrationald();<br /> cout<<endl;<br /> return 0;<br /> }</iostream>

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#include<iostream><br /> using std::cout;<br /> using std::endl;<br /> class rational{<br />              public:<br />                           rational (int=0, int=1);<br />                           rational addition (const rational &#038;);<br />                           rational subtraction (const rational &#038;);<br />                           rational multiplication (const rational &#038;);<br />                           rational division (const rational &#038;);<br />                           void printrational();<br />                           void printrationald();<br />              private:<br />                           int numerator;<br />                           int denominator;<br />                           void reduction();<br /> };<br /> <br /> rational :: rational(int n, int d)<br /> {<br /> int numerstor=n;<br /> int denominator =d;<br /> }<br /> rational rational ::addition (const rational &#038;s)<br /> {<br />              rational w;<br />              w.numerator= s.numerator*denominator;<br />              w.numerator+=s.denominator*numerator;<br />              w.denominator=s.denominator*denominator;<br />              w.reduction();<br />              return w;<br /> }<br /> rational rational:: subtraction(const rational &#038;r)<br /> {<br />              rational w;<br />              w.numerator= r.numerator*denominator;<br />              w.numerator-=r.denominator*numerator;<br />              w.denominator=r.denominator*denominator;<br />              w.reduction();<br />              return w;<br /> }<br /> rational rational ::multiplication (const rational &#038;j)<br /> {<br />              rational w;<br />              w.numerator= j.numerator*denominator;<br />              w.denominator=j.denominator*denominator;<br />              w.reduction();<br />              return w;<br /> }<br /> rational rational ::division (const rational &#038;k)<br /> {<br />              rational w;<br />              w.numerator= k.numerator*denominator;<br />              w.denominator=denominator*k.denominator;<br />              w.reduction();<br />              return w;<br /> }<br /> void rational::printrational()<br /> {<br />              cout<<numerator<<'t'<<denominator;<br /> }<br /> void rational::printrationald();<br /> {<br />              cout<<numerator'/'<<denomirator;<br /> }<br /> void rational:: reduction()<br /> {<br />              int s;<br />              s=numerator<denominator?numerator:denominator;<br />              int x=0;<br />              for (int l=2; l<=s;++l)<br />                           if (numerator % l == 0 &#038;& denominator % l)<br />                                        x= l;<br />                           if (x!= 0)<br />                           {<br />                           int         numinator = x;<br />                           int         denominator = x;<br />                           }<br /> }<br /> int main()<br /> {<br /> rational a(1, 7), f(9,2), h;<br /> a.printrational();<br /> cout<<"+";<br /> f.printrational();<br /> h= a.addition(f);<br /> cout<<"=";<br /> h.printrational();<br /> cout<<'n';<br /> h.printrational();<br /> cout<<"=";<br /> h.printrationald();<br /> a.printrational();<br /> f.printrational();<br /> h=a.subtraction(f);<br /> cout<<"=";<br /> h.printrational();<br /> cout<<'n';<br /> h.printrational();<br /> cout<<"=";<br /> h.printrationald();<br /> a.printrational();<br /> cout<<"h";<br /> f.printrational();<br /> h=a.multiplication(f);<br /> cout<<"=";<br /> h.printrational();<br /> cout<<'n';<br /> h.printrational();<br /> cout<<'=';<br /> h.printrationald();<br /> a.printrational();<br /> f.printrational();<br /> h=a.division(f);<br /> cout<<"=";<br /> h.printrational();<br /> h.printrational();<br /> cout<<"=";<br /> h.printrationald();<br /> cout<<endl;<br /> return 0;<br /> }</iostream>

[msaqib]

Hello, you have done the following things wrong:
in the function definition ; is not allowed void rational::printrationald() also you will need to correct the variable name denominator I hope now your problem will be solved.

#include<br /> using std::cout;<br /> using std::endl;<br /> class rational{<br /> public:<br /> rational (int=0, int=1);<br /> rational addition (const rational &amp;);<br /> rational subtraction (const rational &amp;);<br /> rational multiplication (const rational &amp;);<br /> rational division (const rational &amp;);<br /> void printrational();<br /> void printrationald();<br /> private:<br /> int numerator;<br /> int denominator;<br /> void reduction();<br /> };<br /> rational :: rational(int n, int d){<br /> int numerstor=n;<br /> int denominator =d;<br /> }<br /> rational rational ::addition (const rational &amp;s){<br /> rational w;<br /> w.numerator= s.numerator*denominator;<br /> w.numerator+=s.denominator*numerator;<br /> w.denominator=s.denominator*denominator;<br /> w.reduction();<br /> return w;<br /> }<br /> rational rational:: subtraction(const rational &amp;r){<br /> rational w;<br /> w.numerator= r.numerator*denominator;<br /> w.numerator-=r.denominator*numerator;<br /> w.denominator=r.denominator*denominator;<br /> w.reduction();<br /> return w;<br /> }<br /> rational rational ::multiplication (const rational &amp;j)<br /> {<br /> rational w;<br /> w.numerator= j.numerator*denominator;<br /> w.denominator=j.denominator*denominator;<br /> w.reduction();<br /> return w;<br /> }<br /> rational rational ::division (const rational &amp;k)<br /> {<br /> rational w;<br /> w.numerator= k.numerator*denominator;<br /> w.denominator=denominator*k.denominator;<br /> w.reduction();<br /> return w;<br /> }<br /> void rational::printrational()<br /> {<br /> cout&lt;&lt;numerator&lt;&lt;&#039;t&#039;&lt;&lt;denominator;<br /> }<br /> <strong>void rational::printrationald(); // you should write like that void rational::printrationald() without the ;</strong><br /> {<br /> <strong>cout&lt;&lt;numerator&#039;/&#039;&lt;&lt;denomirator; //spellings for denomirator are wrong you should write denominator</strong><br /> }<br /> void rational:: reduction()<br /> {<br /> int s;<br /> s=numerator&lt;denominator?numerator:denominator;<br /> int x=0;<br /> for (int l=2; l&lt;=s;++l)<br /> if (numerator % l == 0 &amp;&amp; denominator % l)<br /> x= l;<br /> if (x!= 0)<br /> {<br /> int numinator = x;<br /> int denominator = x;<br /> }<br /> } int main()<br /> {<br /> rational a(1, 7), f(9,2), h;<br /> a.printrational();<br /> cout&lt;&lt;&quot;+&quot;;<br /> f.printrational();<br /> h= a.addition(f);<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrational();<br /> cout&lt;&lt;&#039;n&#039;;<br /> h.printrational();<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrationald();<br /> a.printrational();<br /> f.printrational();<br /> h=a.subtraction(f);<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrational();<br /> cout&lt;&lt;&#039;n&#039;;<br /> h.printrational();<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrationald();<br /> a.printrational();<br /> cout&lt;&lt;&quot;h&quot;;<br /> f.printrational();<br /> h=a.multiplication(f);<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrational();<br /> cout&lt;&lt;&#039;n&#039;;<br /> h.printrational();<br /> cout&lt;&lt;&#039;=&#039;;<br /> h.printrationald();<br /> a.printrational();<br /> f.printrational();<br /> h=a.division(f);<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrational();<br /> h.printrational();<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrationald();<br /> cout&lt;&lt;endl;<br /> return 0;<br /> }<br />

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#include<br /> using std::cout;<br /> using std::endl;<br /> class rational{<br /> public:<br /> rational (int=0, int=1);<br /> rational addition (const rational &amp;);<br /> rational subtraction (const rational &amp;);<br /> rational multiplication (const rational &amp;);<br /> rational division (const rational &amp;);<br /> void printrational();<br /> void printrationald();<br /> private:<br /> int numerator;<br /> int denominator;<br /> void reduction();<br /> };<br /> rational :: rational(int n, int d){<br /> int numerstor=n;<br /> int denominator =d;<br /> }<br /> rational rational ::addition (const rational &amp;s){<br /> rational w;<br /> w.numerator= s.numerator*denominator;<br /> w.numerator+=s.denominator*numerator;<br /> w.denominator=s.denominator*denominator;<br /> w.reduction();<br /> return w;<br /> }<br /> rational rational:: subtraction(const rational &amp;r){<br /> rational w;<br /> w.numerator= r.numerator*denominator;<br /> w.numerator-=r.denominator*numerator;<br /> w.denominator=r.denominator*denominator;<br /> w.reduction();<br /> return w;<br /> }<br /> rational rational ::multiplication (const rational &amp;j)<br /> {<br /> rational w;<br /> w.numerator= j.numerator*denominator;<br /> w.denominator=j.denominator*denominator;<br /> w.reduction();<br /> return w;<br /> }<br /> rational rational ::division (const rational &amp;k)<br /> {<br /> rational w;<br /> w.numerator= k.numerator*denominator;<br /> w.denominator=denominator*k.denominator;<br /> w.reduction();<br /> return w;<br /> }<br /> void rational::printrational()<br /> {<br /> cout&lt;&lt;numerator&lt;&lt;&#039;t&#039;&lt;&lt;denominator;<br /> }<br /> <strong>void rational::printrationald(); // you should write like that void rational::printrationald() without the ;</strong><br /> {<br /> <strong>cout&lt;&lt;numerator&#039;/&#039;&lt;&lt;denomirator; //spellings for denomirator are wrong you should write denominator</strong><br /> }<br /> void rational:: reduction()<br /> {<br /> int s;<br /> s=numerator&lt;denominator?numerator:denominator;<br /> int x=0;<br /> for (int l=2; l&lt;=s;++l)<br /> if (numerator % l == 0 &amp;&amp; denominator % l)<br /> x= l;<br /> if (x!= 0)<br /> {<br /> int numinator = x;<br /> int denominator = x;<br /> }<br /> } int main()<br /> {<br /> rational a(1, 7), f(9,2), h;<br /> a.printrational();<br /> cout&lt;&lt;&quot;+&quot;;<br /> f.printrational();<br /> h= a.addition(f);<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrational();<br /> cout&lt;&lt;&#039;n&#039;;<br /> h.printrational();<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrationald();<br /> a.printrational();<br /> f.printrational();<br /> h=a.subtraction(f);<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrational();<br /> cout&lt;&lt;&#039;n&#039;;<br /> h.printrational();<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrationald();<br /> a.printrational();<br /> cout&lt;&lt;&quot;h&quot;;<br /> f.printrational();<br /> h=a.multiplication(f);<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrational();<br /> cout&lt;&lt;&#039;n&#039;;<br /> h.printrational();<br /> cout&lt;&lt;&#039;=&#039;;<br /> h.printrationald();<br /> a.printrational();<br /> f.printrational();<br /> h=a.division(f);<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrational();<br /> h.printrational();<br /> cout&lt;&lt;&quot;=&quot;;<br /> h.printrationald();<br /> cout&lt;&lt;endl;<br /> return 0;<br /> }<br />

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