char val;
void setup() {
    pinMode(13, OUTPUT);
    Serial.begin(9600);
    digitalWrite(13, HIGH);
}
void loop() {
    if (Serial.available()) {
        val = Serial.read();
        Serial.println(val);
    }
    if (val == '1') {
        digitalWrite(13, LOW);
    }
    else if (val == '2') {
        digitalWrite(13, HIGH);
    }
    delay(100);
}

Line: 1:1: Cannot find name 'char'.Line: 1:6: Cannot find name 'val'. Did you mean 'eval'?Line: 4:6: Cannot find name 'setup'.Line: 6:5: Cannot find name 'pinMode'.Line: 6:17: Cannot find name 'OUTPUT'.Line: 7:5: Cannot find name 'Serial'.Line: 8:5: Cannot find name 'digitalWrite'.Line: 8:22: Cannot find name 'HIGH'.Line: 12:6: Cannot find name 'loop'.Line: 14:9: Cannot find name 'Serial'.Line: 15:9: Cannot find name 'val'.Line: 15:15: Cannot find name 'Serial'.Line: 16:9: Cannot find name 'Serial'.Line: 16:24: Cannot find name 'val'.Line: 18:9: Cannot find name 'val'.Line: 19:9: Cannot find name 'digitalWrite'.Line: 19:26: Cannot find name 'LOW'.Line: 22:14: Cannot find name 'val'.Line: 23:9: Cannot find name 'digitalWrite'.Line: 23:26: Cannot find name 'HIGH'.Line: 29:5: Cannot find name 'delay'.Line: 1:1: Unexpected keyword or identifier.Line: 4:14: ';' expected.Line: 12:13: ';' expected.

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