source: soft/tp18/correction/main2.c @ 30

#include "stdio.h"

///////////
int main2()
{
        int opx;
        int opy;
        int x;
        int y; 

        tty_puts(" TASK 2 : PGCD \n");

        while (1) 
        {
                tty_puts("\n*******************\n");
                tty_puts("operand X = ");
                tty_getw_irq(&opx);
                tty_puts("\n");
                tty_printf("operand Y = ");
                tty_getw_irq(&opy);
                tty_puts("\n");
             
                if( (opx < 1) || (opy < 1) ) 
                {
                        tty_puts("operands must be larger than 0\n");
                } 
                else 
                {
                        x = opx;
                        y = opy;
                        while (x != y) 
                        {               
                                if(x > y)       x = x - y;
                                else            y = y - x;
                        }
                        tty_printf("pgcd(%d,%d) = %d\n", opx, opy, x);
                }
        }
        return 0;
} // end main