Redirecting I/O only with <iostream> [Windows] - c++

Question

[#tl;dr] I have Visual Studio Ultimate 2013 and Eclipse Neon v2(C++),
and I need to redirect the output of my program using DOS format, but
I have no idea how.
Im on Windows btw.
OK.. so I have this class assignment where I have to write a program like this:
#include <iostream>
#include <string>
using namespace std;
/* Check if the Character is lower case or not */
bool checkLowerCase(char c) {
if (c >= 'a' && c <= 'z') return true;
return false;
}
/*
* If there is any lower case letter, it will replace it will a upper case.
* example:
* "Tauros" will become "TAUROS"
* "auHU" will become "AUHU"
*/
string fixer(string s)
{
char right = ('a' - 'A');
string a = s;
for (unsigned int i = 0; i < a.length(); i++)
{
if (checkLowerCase(a[i])) {
a[i] = a[i] - right;
}
}
return a;
}
int main(void)
{
while (1) //infinite loop
{
string line;
getline(cin, line);
if (!cin) { //Professor wants us to only check end of input like this
return 0;
}
line = fixer(line);
cout << line << endl;
}
}
The input was:
aaaaaa
bbbbbb
cccccc
The output was:
aaaaaa
AAAAAA
bbbbbb
BBBBBB
cccccc
CCCCCC
Thanks for reading this far. Ok, so here's my problem.
The output is all messed up, so I need to redirect the output somewhere else (at least for testing).
I know how to do that using , , holding each line in a Array of String, reallocating if needed and then print what is on the array, but, unfortunately, my lecturer demanded us only to include and
Ohh, I dont know if it will matter, but we may not use char*, only the class string.
My lecturer told us that we have to use DOS format. But I have no clue how to do that. If someone can tell me how to do either redirect the input or the output is finee...
I have in my PC both Eclipse C++ (working glitchy) and Visual Studio Ultimate 2013 (working fine).
[Edit] Im on Windows.
AGAIN: I may only include and
For more information, here's his slide on DOS format.
*For testing purposes one redirect to/from a file
*DOS formatting will have unexpected consequences
– The end-of-line is the CR-NL combination
– A line read from the file will end with CR
– The CR character is the command to erase the
previous line!
./main < infile.txt Input is from infile.txt
./main > outfile.txt Output is to outfile.txt
./main < infile.txt > outfile.txt Both input and output are redirected

Answer 1

OK, so... I found instructions that helped me here:
https://msdn.microsoft.com/en-us/library/ms235639.aspx
I opened my project folder in the VisualStudio, created 2 files.
input.txt
output.txt
I opened the Developer Command Prompt for VS2013 that I had in my PC.
cd ["C://my_project_path"] //go to my project folder
cl /EHsc file.cpp
/*
cl /EHsc will compile my program (I think it only compiles one file at a time.
I have yet to test it).
*/
file < input.txt > output.txt // this command will run my program
So when I run my program like this... Instead of waiting for an input from keyboard, my program will read input.txt as the standard input. And when I try to print something to the output, it will write on the output.txt instead.
[EDIT] at the end of the link I pasted, there are explanations on how to compile multiple files and what exacly does the /EHsc do exacly