read a file c++
// reading a text file #include <iostream> #include <fstream> #include <string> using namespace std; int main () { string line; ifstream myfile ("example.txt"); if (myfile.is_open()) { while ( getline (myfile,line) ) { //use line here } myfile.close(); } else cout << "Unable to open file"; return 0; }
c++ writing to file
// basic file operations #include <iostream> #include <fstream> using namespace std; int main () { ofstream myfile; myfile.open ("example.txt"); myfile << "Writing this to a file.\n"; myfile.close(); return 0; }
obj c write file
//writes an textfile to an place in the document directory -(void)write:(NSString *)dir file:(NSString *)ff{ //get the documents directory: NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; //make a file name to write the data to using the documents directory: NSString *fileName = [NSString stringWithFormat:[@"%@/" stringByAppendingString:dir], documentsDirectory]; //creates the content NSString *content = ff; //save content to the documents directory [content writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil]; } //usage: [self write:@"text.txt" file:@"this text will be saved"];
how to read and write in a file c++
#include <iostream> #include <fstream> using namespace std; ifstream file_variable; //ifstream is for input from plain text files file_variable.open("input.txt"); //open input.txt file_variable.close(); //close the file stream /* Manually closing a stream is only necessary if you want to re-use the same stream variable for a different file, or want to switch from input to output on the same file. */ _____________________________________________________ //You can also use cin if you have tables like so: while (cin >> name >> value)// you can also use the file stream instead of this { cout << name << value << endl; } _____________________________________________________ //ifstream file_variable; //ifstream is for input from plain text files ofstream out_file; out_file.open("output.txt"); out_file << "Write this scentence in the file" << endl;
write to file in C++
ofstream myfile; myfile.open("file.txt"); myfile << "write this to file"
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