в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:31:11Z

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==file output with characters==

<source lang="cpp">#include <fstream>
#include <iostream>
#include <string>
using namespace std;

int main(){
string str = "AAA";

ofstream outfile("TEST.TXT");
for(int j=0; j<str.size(); j++)
outfile.put( str[j] );
cout << "File written\n";
return 0;
}</source>

==file output with strings==

<source lang="cpp">#include <fstream>
using namespace std;

int main(){
ofstream outfile("TEST.TXT");

outfile << "test\n";
outfile << "1\n";
outfile << "2\n";
outfile << "3\n";
return 0;
}</source>

==Output a text file character by character==

<source lang="cpp">#include <iostream>
#include <fstream>
using namespace std;
int main(void){
ifstream in("test.cpp");
if(!in){
cout << "Cannot open file." << endl;
exit (1);
}
in.ignore(10, " ");
char c;
while(in)
{
in.get(c);
cout << c;
}
in.close();
}</source>

==Output string and decimal in hexadecimal format to a file with ostrstream==

<source lang="cpp">#include <strstream>
#include <iostream>
using namespace std;
main()
{
char str[80];
int a = 10;

ostrstream outs(str, sizeof(str));

outs << "Hello there ";
outs << a+44 << hex << " ";
outs.setf(ios::showbase);
outs << 100 << ends;

cout << str;

return 0;
}</source>

==Output to file line by line==

<source lang="cpp">#include <fstream.H>

int main ()
{
ofstream myfile("test.txt");
if (myfile.is_open())
{
myfile << "This outputting a line.\n";
myfile << "this is another line.\n";
myfile.close();
}
return 0;
}</source>

==Save string double pair to file==

<source lang="cpp">#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ofstream out("test.txt"); // output, normal file
if(!out) {
cout << "Cannot open test.txt file.\n";
return 1;
}
out << "R " << 9.9 << endl;
out << "T " << 9.9 << endl;
out << "M " << 4.8 << endl;
out.close();
return 0;
}</source>

==Use ofstream to write text to a file==

<source lang="cpp">#include <iostream>
#include <fstream>
using namespace std;
main(void)
{
char *p = "hello there";

ofstream out("test");
if(!out) {
cout << "Cannot open file";
return 1;
}

while(*p) out.put(*p++);

out.close();

return 0;
}</source>

==Use put() to write to a file==

<source lang="cpp">#include <iostream>
#include <fstream>
using namespace std;

int main()
{
char *p = "hello\n";

ofstream out("test", ios::out | ios::binary);
if(!out) {
cout << "Cannot open file.\n";
return 1;
}

// Write characters until the null-terminator is reached.
while(*p)
out.put(*p++);

out.close();

return 0;
}</source>

==Write formatted output to a text file.==

<source lang="cpp">#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ofstream fout("test.dat");
if(!fout) {
cout << "Cannot open file.\n";
return 1;
}
fout << 10 << " " << -20 << " " << 30.2 << "\n";
fout << "This is a test.";
fout.close();
if(!fout.good()) {
cout << "A file error occurred.";
return 1;
}
}</source>

==Write to file==

<source lang="cpp">#include <iostream>
#include <fstream>
using namespace std;

int main()
{
ofstream out("test.txt");
if(!out) {
cout << "Cannot open file.\n";
return 1;
}

out << 10 << " " << 123.23 << "\n";
out << "This is a text.";

out.close();

return 0;
}</source>

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