Please help out noob

i have arduino uno using on windows 10 , arduino 1.8.0.
my problem code doesn't work way typed after using serial communication (serial.begin(9600)) arduino doesnt perform code program before serial communication work find.

i've tryed example blink, fade, analogreadserial,
they worked


 

code: [select]



int l=1;
void setup(){
pinmode(13,output);
pinmode(0,output);
serial.begin(9600);

}

void loop(){
for(int x=0;x<10;x++){
digitalwrite(13,high);
delay(100);
digitalwrite(13,low);
delay(100);
digitalwrite(0,high);
delay(100);
digitalwrite(0,low);
delay(100);

}
serial.print("loops:");
serial.println(l)
l=l+1;



}


only pin 13 , serial monitors worked.

sorry, there no way 1 can out description. try explain 1 single problem first.

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