#include <Keypad.h>
#define Row 4 
#define Col 4 
 char keys[Row][Col]=
 {
   {'1','2','3','+'},
   {'4','5','6','B'},
   {'7','8','9','C'},
   {'*','0','#','='}
 };

byte rowpin[Row]={2,3,4,5 };
byte colpin[Col]={6,7,8,9};
Keypad key=Keypad(makeKeymap(keys),rowpin, colpin,Row, Col );



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

}

void loop() {
  // put your main code here, to run repeatedly:
    char    store=key. getKey();
    if(store)
    {
      Serial. print(store);
    }


}