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| #include<iostream>
#include<iomanip>
#include<fstream>
#include<sstream>
#include<cmath>
#include<cstdlib>
#include<string>
#include<list>
#include <forward_list>
#include<vector>
#include<unordered_map>
#include<algorithm>
#include <array>
#include <regex>
#include<random>
#include<stdexcept>
using namespace std;
//программа для работы с логическими операциями
inline void error(const string& s)
{
throw runtime_error(s);
}
inline void keep_window_open()
{
cin.clear();
cout << "Please enter a character to exit\n";
char ch;
cin >> ch;
return;
}
inline void keep_window_open(string s)
{
if (s == "") return;
cin.clear();
cin.ignore(120, '\n');
for (;;) {
cout << "Please enter " << s << " to exit\n";
string ss;
while (cin >> ss && ss != s)
cout << "Please enter " << s << " to exit\n";
return;
}
}
void print_binary(char c) //вывод на экран в бинарном виде
{
int k = 128;
//printf("%d ", (int)c);
while (k > 0)
{
printf("%d", bool(c & k));
k = k >> 1;
};
printf("\n");
}
class Token {
public:
char kind; // для операций
char value; // для переменных
Token(char ch) // make a Token from a char
:kind(ch), value(' ') { }
Token(char ch, char val) // make a Token from a char and a double
:kind(ch), value(val) { }
};
//------------------------------------------------------------------------------
class Token_stream {
public:
Token_stream(); // make a Token_stream that reads from cin
Token get(); // get a Token (get() is defined elsewhere)
void putback(Token t); // put a Token back
private:
bool full; // is there a Token in the buffer?
Token buffer; // here is where we keep a Token put back using putback()
};
//------------------------------------------------------------------------------
// The constructor just sets full to indicate that the buffer is empty:
Token_stream::Token_stream()
:full(false), buffer(' ', ' ') // no Token in buffer
{
}
//------------------------------------------------------------------------------
// The putback() member function puts its argument back into the Token_stream's buffer:
void Token_stream::putback(Token t)
{
if (full) error("putback() into a full buffer");
buffer = t; // copy t to buffer
full = true; // buffer is now full
}
//------------------------------------------------------------------------------
Token_stream ts;
//------------------------------------------------------------------------------
Token Token_stream::get() //работает с !, ~ и буквами
{
if (full) { // do we already have a Token ready?
// remove token from buffer
full = false;
return buffer;
}
char left_ch;
char ch;
cin >> left_ch; // note that >> skips whitespace (space, newline, tab, etc.)
switch (left_ch)
{
case '!':
{
cin >> ch;
return Token('8', !ch);
}
case '~':
{
cin >> ch;
return Token('8', ~ch);
}
case '^': case '|':
case '(': case ')': case '&': case '=':
return Token(left_ch); // let each character represent itself
case 'a':
case 'b': case 'c': case 'd': case 'e': case 'f':
case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's':
case 't': case 'u': case 'v': case 'w': case 'x':
case 'y': case 'z':
{
return Token('8', left_ch); // let '8' represent "a number"
}
default:
error("Bad token");
}
}
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
Token b_and() //работает с &
{
Token left = ts.get();
if (left.kind == '=')
return left;
Token t = ts.get();
switch (t.kind) {
case '&': // we use '8' to represent a number
t = ts.get();
left.value &= t.value;
return left;
case '=':
return Token(t.kind, left.value);
default:
ts.putback(t);
return left;
}
}
//работает с ^
Token b_xor()
{
Token left = b_and();
if (left.kind == '=')
return left;
Token t = ts.get();
switch (t.kind) {
case '^':
{
t = b_and();
left.value ^= t.value;
return left;
}
case '=':
return Token(t.kind, left.value);
default:
ts.putback(t);
return left;
}
}
// работает с |
Token b_or()
{
Token left = b_xor();
if (left.kind == '=')
return left;
Token t = ts.get();
switch (t.kind) {
case '|':
{
t = b_and();
left.value |= t.value;
return left;
}
case '=':
return Token(t.kind, left.value);
default:
ts.putback(t);
return left;
}
}
//------------------------------------------------------------------------------
int main()
try
{
setlocale(LC_ALL, "Russian");
cout << "Добро пожаловать в побитовый логический калькулятор!\n" <<
"Вводите логическую операцию\n\n" <<
"Программа умеет работать со скобками и операциями !, ~, ^, |, &\n" <<
"Для получения результата введите '=' в конце выражения.\n\n";
Token val(' ', ' ');
while (cin)
{
// char x; //код чтобы смотреть бинарный код символов
// cin >> x;
// print_binary(x);
Token t = ts.get();
if (t.kind == '=') // ';' for "print now"
{
cout << " = ";
print_binary(val.value);
break;
}
else
ts.putback(t);
val = b_or();
cout << val.kind << " ";
print_binary(val.value);
cout << "\n";
}
keep_window_open();
}
catch (exception& e) {
cerr << "error: " << e.what() << '\n';
keep_window_open();
return 1;
}
catch (...) {
cerr << "Oops: unknown exception!\n";
keep_window_open();
return 2;
} |