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    void setup()
    {
      pinMode(13, OUTPUT);      
    }
 
    void loop()
    {
      int a = 1, b = 6;
 
      if (a, b > 5) {
        digitalWrite(13, HIGH);
        delay(100);
 
        digitalWrite(13, LOW);
        delay(900);
      } else {
        digitalWrite(13, LOW);
        delay(900);
 
      }
 
    }
 
 

prog.c: In function ‘setup’:
prog.c:3:7: warning: implicit declaration of function ‘pinMode’ [-Wimplicit-function-declaration]
       pinMode(13, OUTPUT);
       ^~~~~~~
prog.c:3:19: error: ‘OUTPUT’ undeclared (first use in this function)
       pinMode(13, OUTPUT);
                   ^~~~~~
prog.c:3:19: note: each undeclared identifier is reported only once for each function it appears in
prog.c: In function ‘loop’:
prog.c:10:12: warning: left-hand operand of comma expression has no effect [-Wunused-value]
       if (a, b > 5) {
            ^
prog.c:11:9: warning: implicit declaration of function ‘digitalWrite’ [-Wimplicit-function-declaration]
         digitalWrite(13, HIGH);
         ^~~~~~~~~~~~
prog.c:11:26: error: ‘HIGH’ undeclared (first use in this function)
         digitalWrite(13, HIGH);
                          ^~~~
prog.c:12:9: warning: implicit declaration of function ‘delay’ [-Wimplicit-function-declaration]
         delay(100);
         ^~~~~
prog.c:14:26: error: ‘LOW’ undeclared (first use in this function)
         digitalWrite(13, LOW);
                          ^~~

Standard output is empty