title: Raspberry Pi: printf() doesn't work with wiringPi
body: <p>I'm trying a simple code that using wiringPi as here:</p>
  
  <pre><code>#include&lt;wiringPi.h&gt;
  #include&lt;stdio.h&gt;
  
  int main(void){
      int i;
  
      wirintPiSetup();
      pinMode(0,OUTPUT);   //a single LED
      pinMode(8,INPUT);    //tactile switch
  
      for(;;){
          delay(500);
          //push tactile switch and LED is turning on
          if(digitalRead(8)) digitalWrite(0,0);
          else digitalWrite(0,1);
          printf("%d",digitalRead(8));
      }
  }
  </code></pre>
  
  <p>I expected a result of printf() is output to console, 
  but it doesn't work.
  printf() couldn't run in same time with wiringPi APIs?</p>
  
  <p>no warnings at compile. and CPU consumption is always under 4%.
  running on Raspbian.</p>
  
  <p>Thanks for your time!</p>