decalring variables dynamically based on read from file
Hi,
Can this be done in C:
I Have a file which has certain number of lines as say
x1=4
x2=4
etc etc, the number of lines are dynamic and not known until i read the file in , So I have a declare variables corresponding to the number of lines after the read, is this possible in C,For in C we have to declare all the variable s upfront? please help
>> Can this be done in C:
Open the file, count the lines, allocate accordingly, rewind the filepointer, and read the file. Pretty straighforward.
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
You could also use something like a linked list. Or perhaps a pointer to a pointer to type, and use realloc as you go. There are usually multiple ways to solve the same problem.
Quzah.
Hope is the first step on the road to disappointment.
I think you just want arrays if the input is of the form 'Xn = x". Simply store each successive value into the next element. However if you want to retain the arbitrary symbolic variable name, say, the user is expecting an interactive calculator.... then you'd also build an array of those names.
The problem with using an array is that you have to know how big your array is supposed to be beforehand. Even using C99's addition of variable sized arrays, it's a bit of a mess.
Quzah.
Hope is the first step on the road to disappointment.
