Cod sursa(job #3255448)

Utilizator MogoneaMIhneaMogonea Mihnea Mihai MogoneaMIhnea Data 10 noiembrie 2024 17:15:54
Problema Evaluarea unei expresii Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.98 kb
#include <fstream>
using namespace std;
ifstream fin ("evaluare.in");
ofstream fout ("evaluare.out");
char s[1000001];
int i;
int constn();
int fact();
int termen();
int exp();
int exp() {
    int r=termen();
    while(s[i]=='+' || s[i]=='-'){
        if (s[i]=='+'){
            i++;
        r +=termen();
        }
        if(s[i]=='-'){
            i++;
        r-=termen();
        }
    }
    return r;
}
int termen(){
    int r=fact();
    while(s[i] == '*' || s[i] == '/'){
        if (s[i]=='*'){
            i++;
        r *= fact();
        }
        if(s[i]=='/'){
            i++;
        r /= fact();
        }
    }
    return r;
}
int fact(){
    int r;
    if (s[i]=='('){
        i++;
        r=exp();
    i++;
    }else
        r=constn();
    return r;
}
int constn() {
    int r=0;
    while(s[i]>='0' && s[i]<='9'){
        r=r*10+s[i]-'0';
    i++;
    }
return r;
}
int main(){
    fin>>s;
    i=0;
    fout<<exp();
}