// C++ program to demonstrate the working of   // ratio_add and ratio_subtract   #include          #include         // for ratio manipulation   using     namespace     std  ;   int     main  ()   {      // Declaring ratios      typedef     ratio   <  5       4  >     ratio1  ;      typedef     ratio   <  3       4  >     ratio2  ;      // Summing two ratios      typedef     ratio_add   <  ratio1       ratio2  >     sum  ;      // Subtracting two ratios      typedef     ratio_subtract   <  ratio1       ratio2  >     diff  ;      // printing sum of ratios      cout      < <     'The sum of ratios is : '  ;      cout      < <     sum  ::  num      < <     '/'      < <     sum  ::  den  ;      cout      < <     endl  ;      // printing difference of ratios      cout      < <     'The difference of ratios is : '  ;      cout      < <     diff  ::  num      < <     '/'      < <     diff  ::  den  ;      cout      < <     endl  ;      return     0  ;   }   

   // C++ program to demonstrate the working of   // ratio_multiply and ratio_divide   #include          #include         // for ratio manipulation   using     namespace     std  ;   int     main  ()   {      // Declaring ratios      typedef     ratio   <  5       4  >     ratio1  ;      typedef     ratio   <  3       4  >     ratio2  ;      // Multiplying two ratios      typedef     ratio_multiply   <  ratio1       ratio2  >     prod  ;      // Dividing two ratios      typedef     ratio_divide   <  ratio1       ratio2  >     div  ;      // printing product of ratios      cout      < <     'The product of ratios is : '  ;      cout      < <     prod  ::  num      < <     '/'      < <     prod  ::  den  ;      cout      < <     endl  ;      // printing division of ratios      cout      < <     'The division of ratios is : '  ;      cout      < <     div  ::  num      < <     '/'      < <     div  ::  den  ;      cout      < <     endl  ;      return     0  ;   }