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Just wondering whether it was possible to actually import a piece of text in from a text file and instead of using arrays to allocate data for it, i want to use a variable
e.g.
<code>
if (Inputted_Text == "int")
{
// then create a new int with the name chosen in a 2nd parameter
}
</code>
I don't think it can be done like that but i was just curious because i wanted to see if i could declare variables in a text file and then input them.
TIA
Just for the future, code tags are in square braces( [ ), not angle braces. I'm not sure I completely understand what you're trying to do, but I'm assuming you'd like to input certain data types from a file just as you might do it from the keyboard. You can use the ifstream object to do this:
Hope that helps...Code:#include <fstream>
using namspace std;
//...
ifstream foo;
foo.open( "The name of your file" );
//Do some checking to make sure the stream is good, look it up
int bar;
foo >>bar; //Inputs an integer from the file
No, you can't create variable names by reading them from a text file. You have to specify variable names when you write the code.
You could map the name you read in to the value you want to hold with it. That is a similar concept.
> <code>
Next time, use square brackets for code tags
This is sort of a long shot since I'm not terribly experienced with templates, but...
As I said, not totally sure if that'll compile or run properly, and it's a cheat anyway.Code:#include <string>
#include <map>
#include <iostream>
template <typename T>
void myFunction()
{
T var;
//do something
}
int main()
{
std::map<std::string, void (*)()> funcMap;
funcMap["unsigned char"] = myFunction<unsigned char>;
funcMap["unsigned short"] = myFunction<unsigned short>;
funcMap["unsigned int"] = myFunction<unsigned int>;
funcMap["unsigned long"] = myFunction<unsigned long>;
funcMap["long double"] = myFunction<long double>;
funcMap["char"] = myFunction<char>;
//etc.
std::string type;
std::getline(std::cin, type);
funcMap[type]();
return 0;
}