String str[]={"abc","defg","hijk","lm","n"};
int num;
void setup() {Serial.begin(115200);num=sizeof(str) /sizeof(str[2]);Serial.print("该数组 str[]的长度:");Serial.print(num);
}void loop() {}
Serial.print(num);
Serial.println(num);
这里的print和println是两个概念,下面感受一下:
Serial.print(num); print整行输出
Serial.println(num); println 换行 输出