TIPS:

1.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.

2.the accuracy of double.

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

here is the following code:

int a,int b;char p;

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

{

}

 

TIPS:

1.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.

2.the accuracy of double.

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

here is the following code:

int a,int b;char p;

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

{

 

}

簡單