Cod sursa(job #2330664)

Utilizator alexdumitrescuDumitrescu George Alex alexdumitrescu Data 28 ianuarie 2019 18:56:20
Problema Evaluarea unei expresii Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.06 kb
#include <fstream>

using namespace std;
ifstream fin ("evaluare.in");
ofstream fout ("evaluare.out");
int i;
char c[100000];

int eval();

int termen();

int factor();

int main()
{
    fin.getline(c, 100000);
    fout << eval();
    return 0;
}

int eval()
{
    int e=termen();
    while(c[i]=='+'||c[i]=='-')
    {
        if(c[i]=='+')
        {
            i++;
            e+=termen();
        }
        else if(c[i]=='-')
        {
            i++;
            e-=termen();
        }
    }
    return e;
}
int termen()
{
    int t=factor();
    while(c[i]=='*'||c[i]=='/')
    {
        if(c[i]=='*')
        {
            i++;
            t=t*factor();
        }
        else if(c[i]=='/')
        {
            i++;
            t=t/factor();
        }
    }
    return t;
}
int factor()
{
    int f=0;
    if(c[i]=='(')
    {
        i++;
        f=eval();
        i++;
    }
    else
    while(c[i]>='0'&&c[i]<='9')
        {
            f=f*10+c[i]-'0';
            i++;
        }
    return f;
}