Arduino Keypad: the following key does not respond

Question

I was wondering, by the time I press the following key, it does not return to the main_screen() function. How can I fix my code?

void loop()
  { 
    int exit = 0;
    char input = customKeypad.getKey();
main_screen();
 if (input=='A')
    { 
      delay(100);
      lcd.clear();

      do{

       lcd.setCursor(1,0);
       lcd.print("Enter minutes: ");


         if (input=='B')
           {
            break;
            lcd.clear();
           }
       }
       while(1);
   }

}

Answer 1

You need to read the input again after you get input == 'A'. At the moment, when you enter the do ... while loop, the input is always 'A', so input == 'B' is never true, and the loop never exits.