Why can''t one open a file in a different directory , C/C++ Programming

Assignment Help:

Why can't one open a file in a different directory like "..\test.dat"?

A: Since " " is a tab character.

You must employ forward slashes in your filenames, even on operating systems which use backslashes (Windows, DOS, OS/2, etc.). For instance:

#include

#include

int main()

{

#if 1

std::ifstream file("../test.dat"); // RIGHT!

#else

std::ifstream file(".. est.dat"); // WRONG!

#endif

...

}

Keep in mind, the backslash ("\") is utilized in string literals to generate special characters: "\b" is a backspace, "\n" is a newline, and "\a" is an "alert", " " is a tab, "\v" is a vertical-tab, etc. Thus the file name "\version\next\alpha\beta est.dat" is interpreted such as a bunch of extremely funny characters. To be secure, employ "/version/next/alpha/beta/test.dat" in spite of, even on systems which use a "\" as the directory separator. It is because the library routines on these operating systems handle "\" and"/" interchangeably.

 

Certainly you could employ "\\version\\next\\alpha\\beta\ est.dat", however that might hurt you (there's a non-zero chance you'll forget one of the "\"s, a rather subtle bug since most people don't notice it) & it can't help you (there's no advantage for using "\\" over "/"). In addition "/" is more portable since it works on all flavors of Unix, Inferno, Plan 9, all Windows, OS/2, etc., however "\\" works only on subset of that list. Thus "\\" costs you something and gains you nothing: use "/" instead.

 


Related Discussions:- Why can''t one open a file in a different directory

C, minimum total number of shelves.

minimum total number of shelves.

Write a program that calculates circumference and area, Write a program cal...

Write a program called A1Q3, that reads it the radius of a circle as an integer and prints the circle's diameter, circumference and area.  Use a constant value for pi.  Do all calc

All topics in c, Give practice in writing program''s..

Give practice in writing program''s..

Explain default arguments, Default Arguments A default argument is a va...

Default Arguments A default argument is a value that is automatically assigned to a formal variable, if the actual argument from the function call is omitted. e.g. void

Functions, differentiate between inbuilt and user defined functions

differentiate between inbuilt and user defined functions

Program of conversion between objects of different classes, Conversion betw...

Conversion between Objects of Different Classes As the compiler does not know anything about the user-defined type, the conversion instructions are to be specified in a functio

COMPILER DESIGN, aj is a newbie to the programming and while learning the p...

aj is a newbie to the programming and while learning the programming language he came to know the following rules: - Each program must start with ''{'' and end with ''}''.

Ans, A palindrome is a string that reads the same from both the ends. Given...

A palindrome is a string that reads the same from both the ends. Given a string S convert it to a palindrome by doing character replacement. Your task is to convert S to palindrome

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd