+// test: echo -e 'set (1, 2, -5, 6, -8, 9, -2, 23, 4)\nord\nshow' | calc.exe | grep -q 'stack: -8 -5 -2 1 2 4 6 9 23'
+// test: echo -e 'set (1, 2, -5, 6, -8, 9, -2, 23, 4)\nmin (5, -3)\nmax (-1)\nmean (1, 2)\nvar (1, 2)\nmin\nmean\nmed\nmax\nprod\nsum\nvar' | calc.exe | awk 'BEGIN { split("9 -3 -1 1.5 0.5 -8 3.33333 2 23 -794880 30 73.3333", v) } /=>/ { for (i in v) if ($2 == v[i]) n++ } END { exit n != 12 }'
+// 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 'format\n.12345678901' | calc.exe | grep -n '=> 6'
+// test: echo -e 'format (8)\n.12345678901' | calc.exe | grep -n '=> 0.12345679'
+// test: echo -e 'format (12)\n.12345678901' | calc.exe | grep -n '=> 0.12345678901'
+// test: echo -e 'format (4)\n.12345678901\format' | calc.exe | grep -n '=> 4'
+// test: echo -e 'format (0)' | calc.exe | grep -n 'error'
+// test: echo -e 'ff + ff' | calc.exe -b 16 | grep -q '=> 1fe'
+// test: echo -e '60 / 4' | calc.exe -b 8 | grep -q '=> 14'
+// test: echo -e 'z00-z0+1-2*z+20x' | calc.exe -b 36 | grep -q '=> 1000'
+// test: echo -e '255' | calc.exe -b 10,16 | grep -q '=> ff'
+// test: echo -e 'base (-2)\nbase (16, 0)' | calc.exe | grep -c error | xargs test 2 =
+// test: echo -e 'base (10, 16)\n255' | calc.exe | grep -q '=> ff'
+// test: echo -e 'base' | calc.exe | grep -q 'base (I/O): 10/10'