in

String inString = "";
void setup() {
Serial.begin(9600);
while (!Serial) { ; }
Serial.println("\n\nString toInt():");
Serial.println(); }
void loop() {
while (Serial.available() > 0) {
int inChar = Serial.read();
if (isDigit(inChar)) {
inString += (char)inChar;
}
if (inChar == '\n') {
Serial.print("Value:");
Serial.println (inString.toInt());
Serial.print ("String: ");
int arr[]={ inString.toInt() };
Serial.println (arr[inString.toInt()]);
inString = ""; } } }