#include <Keypad.h>

int attempts = 1;
float i;
long pass_input = 0;
int pass;
int temp;



char key;
const byte ROWS = 4;
const byte COLS = 4;
byte rowPins[ROWS] = {14, 15, 16, 17};
byte colPins[COLS] = {A3, A2, A1, A0};
char keys[ROWS][COLS] = {
    {'1', '2', '3', '+'},
    {'4', '5', '6', '-'},
    {'7', '8', '9', '*'},
    {'.', '0', '=', '/'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

int Password() {
    pass_input = 0;
    i = 3.00001;

    while (i >= 0) {
        key = keypad.waitForKey();
        if (((key - 48) >= 0) && ((key - 48) <= 9)) {
            temp = key - 48;
            pass_input += temp * pow(10,i);
            i -= 1;
        }
    }
    return pass_input;
}


void setup() {
    Serial.begin(9600);

}

void loop() {
    while (attempts <= 3) {
        pass = Password();
        
    }
    

}

/// END ///