// test: echo -e 'set (1, 2, -5, 6, -8, 9, -2, 23, 4)\nmin (5, -3)\nmax (-1)\nmin\nmean\nmed\nmax\nord\nprod\nsum\nvar\nquit' | calc.exe -n -v 3 | grep -q bye
// test: echo -e 'min\nmean\nmed\nmax\nprod\nsum\nvar\nord\nset (1)\nord' | calc.exe -n | grep -c error | xargs test 9 =
// test: echo -e 'prog (1, cos(pi * arg (1))) / 4' | calc.exe | grep -c error | xargs test 1 =
// test: echo -e 'set (1, 2, -5, 6, -8, 9, -2, 23, 4)\nmin (5, -3)\nmax (-1)\nmin\nmean\nmed\nmax\nord\nprod\nsum\nvar\nquit' | calc.exe -n -v 3 | grep -q bye
// test: echo -e 'min\nmean\nmed\nmax\nprod\nsum\nvar\nord\nset (1)\nord' | calc.exe -n | grep -c error | xargs test 9 =
// test: echo -e 'prog (1, cos(pi * arg (1))) / 4' | calc.exe | grep -c error | xargs test 1 =