Reading ifstream until predefined character

[guilhermecm]

Hello all,

I am programming a circuit simulator that reads PSPICE netlists...well, so the program basically reads a netlist, a text file by ifstream >> thing and I have a problem here:

There are 4 possible cases, I have to read 20e-10, for example, in the 5 cases:
1) there is a 'IC = 20e-10" in the file
2) there is a 'IC= 20e-10" in the file
3) there is a 'IC=20e-10' in the file
4) there is a 'IC =20e-10' in the file
5) there is a '20e-10' without IC= in the file

if I could read until the '=' char and then read the next double (separated or not by space) then my problem would be solved...I need to do it in a simple way

I'd really appreciate any advice, I'd like to do it in the cleanest way
Thanks in advance,
Guilherme

[bartoli]

You could read a full line, then remove all the spaces. Then you look backwards for '=', and pass what is after (or from the start if it was not found) to a function that will convert the number from string to double. The removal of the spaces might even be optionnal depending on how the number conversion function you choose works

[firedraco]

Use getline with an '=' delimiter. This will read everything up to and including the first = character.

[guilhermecm]

using getline with '=' delimiter is a good idea, but there is also the case 5, if I use getline in a pspice file as the number 5 then the file pointer would be sent to the end of the file...

would it be possible to use a getline with 2 delimiters at the same time ('\n' and '=')?

[firedraco]

Ah, true...I'd probably get a whole line at a time then use string functions like find_first_of and substr to get the correct parts that you want.

I don't think there is a way to use multiple delimiters.

[guilhermecm]

well, I did it and it actually worked, so problem solved (in 3 or 4 lines) =)

thx firedraco, thx bartoli