Thread: How to input doubles in to files

This is my code

Code:

	String="("+(std::string)P+"*"+(std::string)L+")"+" ^ "+(std::string)T+" /4= "+(std::string)A+"\n";
	a_file<<String;

P,L,T,A are doubles how can I get a_file to write doubles in to a file

I tried without the (std::string) and I tried just doin

Code:

a_file<<"("<<P<<"*"<<L<<")"<<" ^ "<<T<<" /4= "<<A<<"\n";

I just don't know what to do

I also tried

Code:

	String="("+P+"*"+L+")"+" ^ "+T+" /4= "+A+"\n";
	a_file<<String;