everest% cc -o scan6 scan6.c
everest% cc -o scan8 scan8.c
everest% 

everest% scan6
Enter an integer: 3 abc
r = 1 d = 3
Enter another integer: 4
r = 1 d = 4
everest% 

everest% scan8
Enter an integer: 3 abc
r = 1 d = 3
Enter another integer: 4
r = 1 d = 4
everest% 

everest% more input
3 abc
4
everest% 

everest% scan6 <input
Enter an integer: r = 1 d = 3
Enter another integer: r = 1 d = 4
everest% 

everest% scan8 <input
Enter an integer: r = 1 d = 3
Enter another integer: r = 0 d = 3
everest%