[Doom77]

Вот вроде работает. Не выполняет таких действий 2+(-3) как можно сделать?

Код:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <ctype.h>
#include <assert.h>
#include <iostream>

int tok;
int flag;
double b, a,m, n, h, h0, f,y,i, t;
double tokval, x;

int next() {
    for (;;) {
        int c = getchar();
		if (c == EOF || strchr("kws+-*/^()\n", c) != NULL) return tok = c;
		//if (strchr("m",c)) c=a+'0'; 
		if (isspace(c)) continue;
		if (isdigit(c) || c == '.'|| c=='v'|| c=='s'|| c=='w'|| c=='k'|| c=='m') {
            ungetc(c, stdin);
            scanf(" %lf", &tokval);
            return tok = 'n';
        }
        fprintf(stderr, "Bad character: %c\n", c); abort();
    }
}

void skip(int t) { assert(tok == t); next(); }

double kor();

// numpar ::= number | '(' expr ')'
double numpar() {
    if (tok == 'n') { double x = tokval; skip('n'); return x; }
    skip('('); double x = kor(); skip(')'); return x;
}

// factor ::= numpar | numpar '^' factor
double factor() {
    double x = numpar();
    if (tok == '^') { skip('^'); x = pow(x, factor()); }
    return x;
}

// term ::= factor | term '*' factor | term '/' factor
double term() {
    double x = factor();
    for (;;) {
        if (tok == '*') { skip('*'); x *= factor(); }
        else if (tok == '/') { skip('/'); x /= factor(); }
        else return x;
    }
}

// expr ::= term | expr '+' term | expr '-' term
double expr() {
    double x = term();
    for (;;) {
        if (tok == '+') { skip('+'); x += term(); }
        else if (tok == '-') { skip('-'); x -= term(); }
        else return x;
    }
}
double sinn(){
	double x= expr();
	for(;;){
	
		if (tok == 's') { skip('s'); x = sin(expr());}
		return x;
	}
}

double coss(){
	double x= sinn();
	for(;;){
	
		if (tok == 'w') { skip('w'); x = cos(sinn());}
		return x;
	}
}
double kor() {
    double x = coss();
    if (tok == 'k') { skip('k'); x = sqrt(coss()); }
    return x;
}

int main() {
next();
while (tok != EOF) {
if (tok == '\n') { skip('\n'); continue; }
printf("%.9g\n", kor());
}
return 0;
}