The following code example is taken from the book
Object-Oriented Programming in C++
by Nicolai M. Josuttis, Wiley, 2002
© Copyright Nicolai M. Josuttis 2002
#include <iostream> // C++ header file for I/O
int main()
{
int counter = 0; // current number of found four-digit numbers
// for every number from 1000 to 9999
for (int number=1000; number<10000; ++number) {
// separate the first and last two digits
int front = number/100; // the first two digits
int back = number%100; // the last two digits
// if the sum of the squares produce the original number,
// output number and increment counter
if (front*front + back*back == number) {
std::cout << number << " == "
<< front << "*" << front << " + "
<< back << "*" << back << std::endl;
++counter;
}
}
// output number of four-digit numbers found
std::cout << counter << " numbers found" << std::endl;
}