Реферат: Системное программное обеспечение

case '+':

case '-':

case '(':

case ')':

case '=':

return curr_tok=ch;

case '0': case '1': case '2': case '3': case '4':

case '5': case '6': case '7': case '8': case '9':

case '.':

cin.putback(ch);

cin >> number_value;

return curr_tok=NUMBER;

default:

if (isalpha(ch)) {

char* p = name_string;

*p++ = ch;

while (cin.get(ch) && isalnum(ch)) *p++ = ch;

cin.putback(ch);

*p = 0;

return curr_tok=NAME;

}

error ("bad token");

return curr_tok=PRINT;

}

}

int main(int argc, char* argv[])

{

switch (argc) {

case 1: