Thread: My output from an output file is giving NAN but my operations are correct

Use the debugger to find out when does the NaN occur. From there, you would have a better idea what is causing this.

Originally Posted by skeetskeetlit

Is it bc the code is reading the text file wrong?

You should check for successful I/O: check the return value of getline, check that the files were opened correctly. Incidentally, you should prefer to create the file objects while initialising them, e.g.,

Code:

ifstream fin("whatever.txt");
if (!fin) {
    // there's an error opening the file so report it and handle it
}

This is the principle that variables should be declared near first use, in as small a scope as feasible. Likewise, it makes no sense to write:

Code:

string line1;
line1=input;

when you could have written:

Code:

string line1 = input;

but then it looks like you don't need this line1 variable in the first place.

By the way, it would be better to post your code in [code][/code].

On the face of it, you never actually read a line (or line1) from your input file, but blindly assume that your conversion of the cin line (on line 31) is successful.