SORRY ,  I submitted the report carelessly.

here is my update version:

TIPS:

1.Before,I solve this problem. The regulation was found.

2.First, I build a table to calculate all situations because if I didn't do that it will take a lots of time and I maybe not pass the CPE for "TIMELIMIT ERROR".

BE AWARE OF:

1.the format of output.

C++

use the instruction,setw() and setprecision().

C

use the flag of printf, such as printf("%3.2lf");

2.the accuracy of double.

the more safety way is:use tow integer to input. 

here is the following code:

//C++

int a,int b;char p;

while(cin>>a>>p>>b)

{

  int x=a+100*b;

}

//C

int a,int b;char p;

while(scanf("%d.%d",&a,&b)!=EOF)

{

      int x=a+100*b;

}