Connect to Multiple WiFi Networks Safely

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#include <WiFi.h>

bool connectWiFi(const char * ssid,
  const char * pw, unsigned long timeout = 10000) {
  WiFi.begin(ssid, pw);
  unsigned long t = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - t < timeout) {
    delay(300);
  }
  return WiFi.status() == WL_CONNECTED;
}
void setup() {
  Serial.begin(115200);
  const char * nets[][2] = {
    {
      "A",
      "a_pw"
    },
    {
      "B",
      "b_pw"
    },
    {
      "C",
      "c_pw"
    }
  };
  for (auto & n: nets) {
    if (connectWiFi(n[0], n[1])) {
      Serial.println("Connected!");
      break;
    }
  }
}
void loop() {}