I have the task to write a function that reads a line from a text file (renamed to .dat
, however it contains only text), but I am out of options for a solution because of the following points:
I am using Borland C++ Version 5.02
, and no, I CAN´T download another compiler because I dont have admin rights on my laptop and the guy who has the needed password isnt there until next week.
The compiler does not accept using namespace std
, and also it doesnt accept getline()
, no matter if string
and iostream
are included or not.
I am trying to find a solution or at least the tiniest approach, but I am unable to find one.
So my question is: How do I read a line from a simple textfile without using getline()
( cin.getline
works, the ones from string
or fstream
doesnt)? The textfile contains several lines like these:
1234;12.05.03;08:44:23; XY12-AB;A1-12;Timeout
2345;12.05.03;09:04:34;XY1-CD;A22-9;Connection refused
And the numbers/letters between the ;
need to be stored in variables so they can be worked with.
Im not asking for you to write my code, but I am reallyreaylly frustrated and my instructor is no help.
Live long and prosper, Me.
http://www.cplusplus.com/reference/string/string/getline/
If you cant use (which you really shouldnt)
using namespace std
Then refer to your namespace with :: operator
For example:
std::string
Now try to write your own code using std:: and comment if you still cant do it.
Also, there is a lot of other options than std::getline() to read line of text.
Option 1:
Try using the C's fgets() function.
Option 2: You mention that cin.getline() works. You can freopen stdin with the input file and then cin will point to mentioned file. After that cin.getline() will read from the file:
Downside: After the freopen you will not be able to accept any input from the user.
Example: Note this has not been tried using g++ but I guess it should work with Borland too.
#include <iostream>
#include <stdio.h>
int main() {
char buf[1000];
freopen("somefile.dat", "r", stdin);
while (cin.getline(buf, sizeof(buf)).good()) {
// Now buf contains a line
// Do something with it
}
return 0;
}
Try using
getline(cin >> ws, variableName);
But first, you have to use
using namespace std;
I'm having the same problem while i using multi dimensional array on structs into a file, i have try different ways. But then i tried this one and it's work for me.
So in my case it gonna be like this
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ifstream myFile;
myFile.open("test.txt");
int count = 0;
while (!myFile.eof())
{
getline(myFile >> ws, data[count].string1);
getline(myFile >> ws, data[count].string2);
myFile >> data[count].int1;
for (int i = 0; i < data[count].int1; i++) {
getline(myFile >> ws, data[count].data2[i].string3);
}
count++;
}
return 0;
}
For more: https://www.geeksforgeeks.org/problem-with-getline-after-cin/
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