#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "calculator.h"
#include <math.h>

int main(){
    char line[1024];
    while(fgets(line,sizeof(line),stdin)){
        line[strcspn(line, "\n")] = '\0';
        if (strlen(line) == 0) continue;

        double result = evaluate(line);
        if (isnan(result)) printf("Chyba pri vypocitani vyrazu\n");
        else{
            printf("%.2f\n", result);
        }
    }
    return 0;
}