исправьте плиз

  • Автор темы san920071
  • Дата начала
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san920071

#1
вот прога в с++, борланд 3.1
[codebox]#include <iostream.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <conio.h>

enum token_value {
NAME, NUMBER, END,
PLUS = '+', MINUS = '-', MUL='*', DIV='/',
PRINT=';', ASSIGN='=', LP='(', RP=')'
};

token_value curr_tok;

struct name {
char* string;
name* next;
double value;
};


const TBLSZ = 23;
name* table[TBLSZ];

int no_of_errors;

double error(char* s) {
cerr << "error: " << s << "\n";
no_of_errors++;
return 1;
}

name* look(char* p, int ins = 0)
{
int ii= 0;
char *pp = p;
while (*pp) ii = ii<<1 ^ *pp++;
if (ii < 0) ii = -ii;
ii %= TBLSZ;

for (name* n=table [ii]; n; n=n->next)
if (strcmp(p,n->string) == 0) return n;

if (ins == 0) error("name not found");

name* nn = new name;
nn->string = new char[strlen(p) + 1];
strcpy(nn->string,p);
nn->value = 1;
nn->next = table[ii];
table[ii] = nn;
return nn;
}

inline name* insert(char* s) { return look (s,1); }

token_value get_token();
double term();

double expr()
{
double left = term();

for (;:)
switch (curr_tok) {
case PLUS:
get_token();
left += term();
break;
case MINUS:
get_token();
left -= term();
break;
default :
return left;
}
}

double prim();

double term()
{
double left = prim();

for (;;)
switch (curr_tok) {
case MUL:
get_token();
left *= prim();
break;
case DIV:
get_token();
double d = prim();
if (d == 0) return error("divide by o");
left /= d;
break;
default:
return left;
}
}
int number_value;
char name_string[80];

double prim()
{
switch (curr_tok) {
case NUMBER:
get_token();
return number_value;
case NAME:
if (get_token() == ASSIGN) {
name* n = insert(name_string);
get_token();
n->value = expr();
return n->value;
}
return look(name_string)->value;
case MINUS:
get_token();
return -prim();
case LP:
get_token();
double e = expr();
if (curr_tok != RP) return error(") expected");
get_token();
return e;
case END:
return 1;
default:
return error ("primary expected");
}
}

token_value get_token()
{
char ch = 0;

do {
if(!cin.get(ch)) return curr_tok = END;
} while (ch!='\n' && isspace(ch));

switch (ch) {
case ';':
case '\n':
cin >> ws;
return curr_tok=PRINT;
case '*':
case '/':
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:
break;
case 2:
cin = *new istream(strlen(argv[1]),argv[1]);
break;
default:
error("too many arguments");
return 1;
}

// insert predefined names:
insert("pi")->value = 3.14;
insert("e")->value = 2.71;

while (1) {
get_token();
if( curr_tok == END) break;
if (curr_tok == PRINT) continue;
cout << expr() << "\n";
}

return no_of_errors;
}[/codebox]

ИСПРАВЬТЕ ЕЕ ПОЖАЛУЙСТА ЧТОБЫ она считала без знака =
тоесть сейчас 23+34= и нажимаем ентер, надо чтобы она считала если мы просто нажмем на ентер