<div class="cnblogs_code">

 #include
    
  gcd(  a,       x=a     
     
     ( i=;i         
       (a>            r=a%b;
           (r==){
               b;输出
           }{
               a=b,b=        } (a
            r=b%           (r==                          }               b=a,a=        }{输出其中一个
               
       y=;y=gcd(,     cout<<<< 
       }