> gcc all-tests.c CuTest.c days-month-leap.c

> a.exe
Enter a month - a number between 1 and 12: 11
Enter a year: 2010
There are 30 days in month 11 in year 2010
Enter a month - a number between 1 and 12: 12
Enter a year: 0
There are 31 days in month 12 in year 0


> a.exe --test
........

OK (8 tests)