The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference
by Nicolai M. Josuttis, Addison-Wesley, 1999
© Copyright Nicolai M. Josuttis 1999
#include <cstdlib>
#include <iostream>
using namespace std;
int main()
{
double x, y; // operands
// print header string
cout << "Multiplication of two floating point values" << endl;
// read first operand
cout << "first operand: ";
if (! (cin >> x)) {
/* input error
* => error message and exit program with error status
*/
cerr << "error while reading the first floating value"
<< endl;
return EXIT_FAILURE;
}
// read second operand
cout << "second operand: ";
if (! (cin >> y)) {
/* input error
* => error message and exit program with error status
*/
cerr << "error while reading the second floating value"
<< endl;
return EXIT_FAILURE;
}
// print operands and result
cout << x << " times " << y << " equals " << x * y << endl;
}