/in/calc.cpp:13:5: error: use of undeclared identifier 'int_judgement'
    int_judgement = false;
    ^
/in/calc.cpp:15:9: error: use of undeclared identifier 'int_judgement'
        int_judgement = isdigit(input[0]);
        ^
/in/calc.cpp:25:5: error: use of undeclared identifier 'int_judgement'
    int_judgement = true;
    ^
/in/calc.cpp:28:12: error: use of undeclared identifier 'int_judgement'
        if(int_judgement)
           ^
/in/calc.cpp:47:30: error: use of undeclared identifier 'RPNop'
                int result = RPNop(c,stack);
                             ^
/in/calc.cpp:76:16: error: use of undeclared identifier 'RPNadd_minus_times_divides'
        return RPNadd_minus_times_divides(c,stack);
               ^
/in/calc.cpp:78:16: error: use of undeclared identifier 'RPNadd_minus_times_divides'
        return RPNadd_minus_times_divides(c,stack);
               ^
/in/calc.cpp:80:16: error: use of undeclared identifier 'RPNn'
        return RPNn(stack);
               ^
/in/calc.cpp:82:16: error: use of undeclared identifier 'RPNd'
        return RPNd(stack);
               ^
/in/calc.cpp:84:16: error: use of undeclared identifier 'RPNr'
        return RPNr(stack);
               ^
/in/calc.cpp:86:16: error: use of undeclared identifier 'RPNp'
        return RPNp(stack);
               ^
/in/calc.cpp:88:16: error: use of undeclared identifier 'RPNc'
        return RPNc(stack);
               ^
/in/calc.cpp:90:16: error: use of undeclared identifier 'RPNa'
        return RPNa(stack);
               ^
/in/calc.cpp:121:12: error: use of undeclared identifier 'ch'
    switch(ch)
           ^
14 errors generated.
/in/Compile/Makefile:44: recipe for target 'buildCalc' failed
make: *** [buildCalc] Error 1