Page 263 - DCAP404 _Object Oriented Programming
P. 263
Object-oriented Programming
Notes Ios::app Open in append mode.
Ios::ate Open and seek to end of file.
Ios::in Open in input mode.
Ios::nocreate Fail if file doesn’t already exist.
Ios::noreplace Fail if file already exists.
Ios::out Open in output mode.
Ios::trunc Open and truncate to zero length.
Ios::binary Open as a binary stream.
Example:
1. Basic Program File Structure and Sample Function Call with stream I/O
#include <iostream> // Header for stream I/O.
#include <iomanip> // Header for I/O manipulators.
// Function declaration (prototype) with default values.
float sum(float required_term, float optional_term = 0.0);
//main function
int main(void)
{
int p; // Output numeric precision.
float a; // Units and description of a.
float b; // Units and description of b.
cout.setf(ios::showpoint);
cout << “Enter the output precision (an integer): “;
cin >> p;
if (!cin)
{
cout << “Input error.\n”;
return 1;
}
cout << setprecision(p);
cout << “Enter two real numbers to be summed: “;
cin >> a >> b;
if (!cin)
{
cout << “Input error\n”;
return 2;
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