const int segmentPins[] = {13, 12, 11, 10, 9, 8, 7}; 

const int fourCommonCathode[] = {0, 1, 1, 0, 0, 1, 1};  
void setup() {
    for (int i = 0; i < 7; i++) {
        pinMode(segmentPins[i], OUTPUT);
        digitalWrite(segmentPins[i], fourCommonCathode[i]); 
}
}
void loop() {}