Write a File and Load It

Hello I need help to write a file containing a variable and at start load it,
Im suing that but I dont know why dont writes in the File
Thanks!

Code:

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main(){
int var;
fstream File("C:\File.txt");
	for (int x=0;x<10;++x){
		cout << "Enter Value " << endl;
		cin >> var; 
		File << var << endl;
	}
	File.close();
}

Originally Posted by alvaritos

Hello I need help to write a file containing a variable and at start load it,
Im suing that but I dont know why dont writes in the File
Thanks!

Code:

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main(){
int var;
fstream File("C:\File.txt");
	for (int x=0;x<10;++x){
		cout << "Enter Value " << endl;
		cin >> var; 
		File << var << endl;
	}
	File.close();
}

do:

Code:

ofstream File("C:\File.txt"); 

if( File.good() ){
 File << var << endl;
} else {
 cout<<"Error!"<<endl;
}

that should work, to read files I always do this:

ifstream File(C:\File.txt");

char *buffer;

if(File.good()){
   File.seekg (0, ios::end);
  length = File.tellg();
  File.seekg (0, ios::beg);
  buffer = new char [length];

  File.read (buffer,length);  // buffer = file
  File.close();

} else {
 cout<<"Error"<<endl;
}

Hope that helps

Code:

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main(){
	int var;
	ofstream File("C:\File.php");
		if (File.good() ){
			File << var << endl;
		}
		File.close();
}

Dont writes anything,

^ *facepalm*

KK first off the above code 'var' is not initalized so it wont have any value and prob give you a memory error.

2nd when using file paths its important to rmbr that the character '\' is a special character and in your case "C:\File.txt" would be 'C' , ':' , '\f', 'i', 'l', 'e', '.' , 't', 'x', ,'t'. If you are going to use the backslash it must be "C:\\File.txt" or use normal slash "C:/File.txt"

Code:

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main(){
int var;
fstream File("C:/File.txt");
	for (int x=0;x<10;++x){
		cout << "Enter Value " << endl;
		cin >> var; 
		File << var << endl;
	}
	File.close();
}

Originally Posted by zhaoyun333

^ *facepalm*

KK first off the above code 'var' is not initalized so it wont have any value and prob give you a memory error.

2nd when using file paths its important to rmbr that the character '\' is a special character and in your case "C:\File.txt" would be 'C' , ':' , '\f', 'i', 'l', 'e', '.' , 't', 'x', ,'t'. If you are going to use the backslash it must be "C:\\File.txt" or use normal slash "C:/File.txt"

Code:

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main(){
int var;
fstream File("C:/File.txt");
	for (int x=0;x<10;++x){
		cout << "Enter Value " << endl;
		cin >> var; 
		File << var << endl;
	}
	File.close();
}

Nope, that's wrong, it's not fstream it ofstream output file stream

Originally Posted by .::SCHiM::.

Nope, that's wrong, it's not fstream it ofstream output file stream

Actually SCHiM fstream calls ifstream and ofstream of the same file so you can input/output with the file with only one call.

Thnaks to all it now works,

No, he's correct. fstream inherits from istream and ostream. The default parameter in the constructor provides for both input and output functionality.

Write a File and Load It

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