IDE it do not reconnace the" for " loop and the "serial begin "

Projects Programming
1

the IDE do not reconnace the for loop and the serial monitor?
do some body knows how to fix it
int blueontime = 500;
int blueoftime = 500;

void setup()
{

pinMode (redLEDpin,OUTPUT);
pinMode (blueLEDpin, OUTPUT);
}

void loop() {
for (int j=1;j<=10;j=j+1);{ // it does,t reconnice the "for" loop ???
digitalWrite (redLEDpin, HIGH);
delay (ontimered);
digitalWrite (redLEDpin, LOW);
delay (oftimered);}

digitalWrite (blueLEDpin, HIGH);
delay (blueontime);
digitalWrite (blueLEDpin,LOW);
delay (blueoftime); this problem

2 
for  (int j=1;j<=10;j=j+1);

The trailing semicolon should not be there

There are no serial commands in the code that you posted

3

Your partial code does not compile so it's not going to do anything useful.

You will need a Serial.begin() and some other Serial commands before the serial monitor shows you anything.

Steve

4 
 for  (int j=1;j<=10;j=j+1) ; {
 digitalWrite (redLEDpin, HIGH);

The 'for' loop can only contain one statement or one block of statements surrounded by '{' and '}'. The ';' is a statement so what the compiler sees is:

  for (int j=1; j<=10; j=j+1)
    ;  // Do this null statement ten times...


  // ... then do this block of statements once.
  {
  digitalWrite (redLEDpin, HIGH);