#include <stdio.h>

 #include <ctype.h>

 #define  BUG printf("here!bug!\n");

 int getfloat(float *pn){

     int c;

     int t;

     int intbeforepoint=;

     int intafterpoint=;

     int intafterpoint_lenth=;

     int inte;

     int sign,esign;

     int ppoint;  // 1 means there have point ,otherwise no

     float res=;

     while( isspace(c=getch()) )

         ;

     if(!isdigit(c)&&c!=EOF&&c!='+'&&c!='-'){

         ungetch();

         return ;

     }

     sign=(c=='-')?-:;

     if(c=='+'||c=='-')

         c=getch();

     for(intbeforepoint=;isdigit(c);c=getch())

         intbeforepoint=*intbeforepoint+(c-'');

     ppoint=;

     if(c=='.'){

         ppoint=;

         c=getch();

         for(intafterpoint=;isdigit(c);c=getch()){

             intafterpoint=*intafterpoint+(c-'');

             intafterpoint_lenth++;

         }

         t=intafterpoint;

         while(t%==){

             intafterpoint_lenth--;

             t=t/;

         }

     }

     if(c=='e'||c=='E'){

         c=getch();

         esign=;

         if(c=='+'||c=='-'){

             esign= (c=='+')?:-;

             c=getch();

         }

         while( c==''){

             c=getch();

         }

         for(inte=;isdigit(c);c=getch())

             inte=*inte+(c-'');

     }

     BUG;

     if(c!=EOF)

         ungetch(c);

     res=1.0*intbeforepoint;

     t=intafterpoint_lenth;

     while(t--)

         res*=;

     res+=intafterpoint;

     t=intafterpoint_lenth;

     while(t--)

         res/=;

     if(esign==-){

         while(inte--)

             res/=;

     }else if(esign==){

         while(inte--)

             res*=;

     }

     res*=sign;

     *pn=res;

     printf("intbeforepoint=%d\n",intbeforepoint);

     printf("intafterpoint=%d\n",intafterpoint);

     printf("inte=%d\n",inte);

     printf("length=%d\n",intafterpoint_lenth);

     return c;

 }

 int main(){

     float num[];

     int i;

     for(i=;i<;++i){

         getfloat(&num[i]);

         printf("%lf\n",num[i]);

     }

     return ;

 }