// test: echo -e 'cos (quit)' | calc.exe 2>&1 | grep -q error
// test: echo -e '(quit)' | calc.exe 2>&1 | grep -q error
// test: echo -e 'cos 3.14\n!\n! 3 4' | calc.exe 2>&1 | grep -c error | xargs test 3 =
+// test: echo -e 'sto (2, pi)\ncond (rcl (2) > 2, log (64), exp (75))' | 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 '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 =
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