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#include <Servo.h>
 
Servo servo;//サーボのインスタンス
byte val=90;
static int angle=0;
 
void setup() {
  Serial.begin(9600);
  servo.attach(3);
}
 
void loop(){
  if(Serial.available() > 0){  
    val  = Serial.read();    
    if('0' <= val && val <= '9') // 0～9の文字
    {
      // 180を超えない範囲で元の値を10倍して1の位へ加算
      if(((angle*10)+val-'0')<180) angle=(angle*10)+val-'0';
      else Serial.print('\a'); // Error BEEP to terminal
    }
    else if(val == '\r') // ENTERキーでサーボ更新
    {
      servo.write(angle);
    }
}

prog.cpp:1:19: error: Servo.h: No such file or directory
prog.cpp:3: error: ‘Servo’ does not name a type
prog.cpp:4: error: ‘byte’ does not name a type
prog.cpp: In function ‘void setup()’:
prog.cpp:8: error: ‘Serial’ was not declared in this scope
prog.cpp:9: error: ‘servo’ was not declared in this scope
prog.cpp: In function ‘void loop()’:
prog.cpp:13: error: ‘Serial’ was not declared in this scope
prog.cpp:14: error: ‘val’ was not declared in this scope
prog.cpp:23: error: ‘servo’ was not declared in this scope
prog.cpp:25: error: expected `}' at end of input

Standard output is empty