+// test: echo -e 'sto (2, 3)\ncond (rcl (2) > 2, log (64), exp (75 / 10))' | calc.exe | grep -q '=> 4\.15888'
+// test: echo -e 'sto (2, 1)\ncond (rcl (2) > 2, log (64), exp (75 / 10))' | calc.exe | grep -q '=> 1808\.04'
+// test: echo -e 'sto (2, 1)\ncond (rcl (2) > 2, log (64))' | calc.exe | grep -q '=> 0'
+// test: echo -e 'cond (0, 1, 2)' | calc.exe -v 3 | grep -q Cond
+// test: echo -e 'cond\ncond (\ncond (1 >0,'| calc.exe 2>&1 | grep -c error | xargs test 3 =
+// test: echo -e 'sto (1, 4)\ninc (1)\ninc (1)\ndec (1)\ninc (1)\nrcl (1) == 6' | calc.exe -v 3 | grep -q '=> 1'
+// test: echo -e 'inc\ninc (\ndec\ndec (' | calc.exe 2>&1 | grep -c error | xargs test 4 =
+// test: echo -e 'inc (11)\ndec (0)' | calc.exe 2>&1 | grep -c invalid | xargs test 2 =
+// test: echo -e 'whl (inc (1) < 100, sto (2, rcl (1) + rcl (2)))' | calc.exe | grep -q '=> 5050'
+// test: echo -e 'whl\nwhl (inc (1) < 3,\nwhl (inc (1) < 100, sto (2, rcl (1) + rcl (2))' 2>&1 | calc.exe | grep -c error | xargs test 3 =
+// test: echo -e 'whl (0, 1)' | calc.exe -v 3 | grep -q While
+// test: echo -e '{sto (1, 1 + 1), rcl (1) * 3}' | calc.exe -v 3 | grep -q 'Program'
+// test: echo -e '{sto (1, 1 + 1), rcl (1) * 3}' | calc.exe | grep -q '=> 6'
+// test: echo -e '{\n{}\n{1, 2\n{sto (1, 1 + 1),\npow(2, {sto (1, 1 + 2), 2}, {rcl(2)})\n2 {sto (1, 1 + 1)}' 2>&1 | calc.exe | grep -c error | xargs test 6 =