Scott: Created page with '==Terminal I/O== #include // defines cout, cin, endl using namespace std; ... cout << "Enter your name: "; cin >> name; cout << "Hi there, " << na…'

2011-01-31T19:06:53Z

Created page with '==Terminal I/O== <source lang="cpp"> #include <iostream> // defines cout, cin, endl using namespace std; ... cout << "Enter your name: "; cin >> name; cout << "Hi there, " << na…'

New page

==Terminal I/O==
<source lang="cpp">
#include <iostream> // defines cout, cin, endl
using namespace std;
...
cout << "Enter your name: ";
cin >> name;
cout << "Hi there, " << name << "!" << endl;
</source>

==File I/O==
<source lang="cpp">
#include <iostream>
#include <fstream>
using namespace std;

// reading a file:
void readFile(char* fileName){
fstream infile(fileName);
if (!infile.is_open()){
cerr << "failed to open file " << fileName << endl;
exit(1);
}
const int maxLineSize = 256;
char line[maxLineSize];
int i = 0;
while ( !infile.eof( ) ) {
infile.getline(line, maxLineSize);
cout << "line" << (i++) << ": " << line << endl;
}
}

// write to a file:
void writeStringToFile(char* fileName, string msg){
ofstream outfile(fileName);
if (!outfile.is_open()){
cerr << "failed to open file " << fileName << endl;
exit(1);
}
outfile << msg;
cout << "string successfully written to file" << endl;
}

int main(){
readFile("test.txt");
writeStringToFile("test.txt", "here is more text");
}

//To append, use
// ofstream outfile(fileName, ios::app);
</source>

C++ I/O - Revision history

Scott: Created page with '==Terminal I/O== #include // defines cout, cin, endl using namespace std; ... cout << "Enter your name: "; cin >> name; cout << "Hi there, " << na…'