Simple File Input

[Jordan C Atlas]

Hello, I'm looking for suggestions on how to design an text input file. I imagine that each line of the file would look something like this: Operation argument1 argument2 argument3 etc. I understand how to do file input if you just want to read one word at a time using the >> operator, but I'm not sure how to "check" what the incoming input is. For example, if a line in the input file started with the operation "CreateNewAccount", how do I (programmatically) check what the string says? If I use std::string for the input the >> operator doesn't seem to like it. If I use char arrays, I can't seem to get two strings to be recognized as equal. Thanks you for suggestions for how to do this, or perhaps for better ways to go about it. If there is any part I need to clarify let me know. -Jordan Atlas

[Jordan C Atlas]

To be more specific about the problems I was having: I wanted to try to read the words into string variables so that I could compared them to strings indicating which reaction they correspond to. However, if I try to read the words into std::string variables using something like: inFile >> tempString; then I get a compiler error: error C2679: binary '>>' : no operator defined which takes a right-hand operand of type 'class std::basic_string,class std::allocator >' (or there is no acceptable conversion) I also tried reading the words into char arrays so that I could comapare the char arrays to the string corresponding to a particular operation. If I do that, however, then the comparison doesn't seem to work. Ie: If I read the word "Account" into a char array called charTemp, the statement (charTemp == "Account") seems to evaluate to false (even tho my intention would be for it to be true). I hope that clarifies the problem rather than making it more complicated! Again, I am open to alternative suggestions. -Jordan Atlas

[PJ Arends]

Jordan C. Atlas wrote: inFile >> tempString; then I get a compiler error: error C2679: binary '>>' : no operator defined which takes a right-hand operand of type 'class std::basic_string,class std::allocator >' (or there is no acceptable conversion)

#include <string>

Jordan C. Atlas wrote: the statement (charTemp == "Account") seems to evaluate to false You are comparing two pointers that point to different things so they are obviously not equal. To compare the contents of char arrays you have to use strcmp().

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[Jordan C Atlas]

Thank you - your answer makes sense. I will continue writing the input file using strings. -Jordan Atlas-