int num1 = 123; float num2 = 3.14; const char* str = "Hello, Arduino!"; String str1 = String::format("num1 = %d, num2 = %.2f, str = %s", num1, num2, str); // 输出字符串:num1 = 123, num2 = 3.14, str = Hello, Arduino
#include <Arduino.h> #include <Regexp.h> // called for each match void match_callback(const char *match, // matching string (not null-terminated) const unsigned int length, // length of matching string const MatchState &ms) // MatchState in use (to get captures) { char cap[10]; ...
#include <Arduino.h> #include <string.h> char destination[50]; // 确保有足够的空间 const char* source = "Hello, Arduino!"; void setup() { Serial.begin(9600); // 安全复制字符串 strcpy(destination, source); // 连接字符串 strcat(destination, " Welcome to the world of embedded programmi...
这里，ptr是一个指向 char* 类型的常量，所以不能用ptr来修改所指向的内容，换句话说，*ptr的值为co...
String类) 11.15 array(数组) 十二、数据类型转换 12.1 char() 12.2 byte() 12.3int() 12.4 word() 12.5 long() 12.6 float() 十三、变量作用域&修饰符 13.1 variable scope(变量的作用域) 13.2 static(静态变量) 13.3 volatile 13.4 const 十四、辅助工具 ...
WString: avoid writing to const storage (#8463) Fix Stream::read into buffer ignoring every second byte (#8452, #8453) Fix VM Address mask (#8440) Import getLocalTime() from esp32/Arduino (#8413) Sync umm_malloc style with upstream (#8426) StreamConstPtr: disallow passing a String tem...
WiFiClient client;//声明一个客户端对象,用于与服务器进行连接const int tcpPort=8266;//修改为你建立的Server服务端的端口号,此端口号是创建服务器时指定的。static String comdata="";static String val="";voidsetup(){Serial.begin(115200);pinMode(led,OUTPUT);delay(10);Serial.println();Serial.print...
const char* mqtt_server = "broker.mqtt-dashboard.com"; WiFiClient espClient; PubSubClient client(espClient); long lastMsg = 0; char msg[50]; int value = 0; void setup_wifi() { delay(10); Serial.println(); Serial.print("Connecting to "); ...
char* string = “Hello World!”; Serial.begin(9600); Serial.print(“Serial connection opened! ”); Serial.print(“EEPROM length: ”); Serial.println(EEPROM.length()); Serial.print(“Attempting to erase EEPROM.。. ”); erase();
}voidloop() {AliyunIoTSDK::loop(); }//初始化 wifi 连接voidwifiInit(constchar*ssid,constchar*passphrase) { WiFi.mode(WIFI_STA); WiFi.begin(ssid, passphrase);while(WiFi.status() != WL_CONNECTED) {delay(1000); Serial.println("WiFi not Connect"); } Serial.println("Connected to AP")...