[ccubed]

Okay, so I have this code to convert Doubles to Strings.

string stringify(double x){ 
   ostringstream o; 
   o << x; 
   return o.str(); 
}

My question is two fold. One, assume the double was originally 1.2E+003. I convert it to a string and i'll get something like XXXX.XX, but convert it back to a double via istringstream and I get 1.2E+003. Why?

Two, is there any way to get all the decimal numbers from the double and not round when it converts to string? I'm trying to create a nice round function so that I can convert a number that could have 20+ decimals to 2 decimals. The process would be really simple if i could get it into a string form and then just loop through each number behind the decimal and see if it's higher than 5.

[RedSonja]

1. Because it didn't convert it at all, it just formatted it. the number is still there.

2. I don't know the background of what you are up to, but you can format as you like with sprintf and its friends, but they are very complicated to use. When you use these you have exact control of what is happening. If you use the << of streams you cannot be too sure what you will get, esp. if you port to another compiler or hardware.