poj3979

简单题

View Code

   
     

    
      #include 
    
      <
    
      iostream
    
      >
    
      
#include 
    
      <
    
      cstdio
    
      >
    
      
#include 
    
      <
    
      cstdlib
    
      >
    
      
#include 
    
      <
    
      cstring
    
      >
    
      

    
      using
    
       
    
      namespace
    
       std;


    
      int
    
       gcd(
    
      int
    
       x, 
    
      int
    
       y)
{
 
    
      if
    
       (
    
      !
    
      x 
    
      ||
    
       
    
      !
    
      y)
 
    
      return
    
       x 
    
      >
    
       y 
    
      ?
    
       x : y;
 
    
      for
    
       (
    
      int
    
       t; t 
    
      =
    
       x 
    
      %
    
       y; x 
    
      =
    
       y, y 
    
      =
    
       t)
 ;
 
    
      return
    
       y;
}


    
      int
    
       main()
{
 
    
      //
    
      freopen("t.txt", "r", stdin);
    
      

    
       
    
      int
    
       a, b, c, d, e, f, g;
 
    
      char
    
       op;
 
    
      while
    
       (scanf(
    
      "
    
      %d/%d%c%d/%d
    
      "
    
      , 
    
      &
    
      a, 
    
      &
    
      b, 
    
      &
    
      op, 
    
      &
    
      c, 
    
      &
    
      d) 
    
      !=
    
       EOF)
 {
 f 
    
      =
    
       b 
    
      *
    
       d;
 
    
      if
    
       (op 
    
      ==
    
       
    
      '
    
      +
    
      '
    
      )
 e 
    
      =
    
       a 
    
      *
    
       d 
    
      +
    
       b 
    
      *
    
       c;
 
    
      else
    
      
 e 
    
      =
    
       a 
    
      *
    
       d 
    
      -
    
       b 
    
      *
    
       c;
 g 
    
      =
    
       gcd(abs(e), abs(f));
 e 
    
      /=
    
       g;
 f 
    
      /=
    
       g;
 
    
      if
    
       (f 
    
      <
    
       
    
      0
    
      )
 {
 e 
    
      *=
    
       
    
      -
    
      1
    
      ;
 f 
    
      *=
    
       
    
      -
    
      1
    
      ;
 }
 
    
      if
    
       (f 
    
      ==
    
       
    
      1
    
      )
 printf(
    
      "
    
      %d\n
    
      "
    
      , e);
 
    
      else
    
      
 printf(
    
      "
    
      %d/%d\n
    
      "
    
      , e, f);
 }
 
    
      return
    
       
    
      0
    
      ;
}