#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  lcd.init();
  lcd.backlight();

  Serial.begin(9600);
  char mystring[] = "text!";
  Serial.println (mystring[1]);
  Serial.println (strlen(mystring));
  Serial.println(strupr(mystring));
  Serial.println(strlwr(mystring));
  Serial.println (strrev(mystring));


  char upper = 120; 
  Serial.println(upper);
  upper = upper-32;
  Serial.println(upper);


  char Text2[] = "Testing zZ aA";
  for (int pos=0; pos < strlen(Text2); pos=pos+1) {
    if ((Text2[pos]>=96) && (Text2[pos]<=122)) {
      Text2[pos] = Text2[pos]-32;
    }
  }

  Serial.println(Text2);

  char ASCII = 123;

  lcd.setCursor(0,0);
  lcd.print(mystring);
  lcd.setCursor(0,1);
  lcd.print(ASCII);
  lcd.setCursor(0,2);
  lcd.print(Text2);

}


void loop() {


}