I was trying a tiny code with if statement, although it is very simple,but there is something I really confused here is the code
n<-857
while(n!=1){
if(n<=0)
print("please input a positive integer")
else if(n%%2==0)
n<-n/2
print(n)
else
n<-3*n+1
print(n)
}
as we see above,when running this code in R, there comes the error,but if I change the if statement like this
if(n<=0)
print("please input a positive integer")
else if(n%%2==0)
n<-n/2
else
n<-3*n+1
it is ok ,my question is that can we only write one line under each judgement? if I want to do something more after each judge, what should I do ,just like this case, I want to change the value of n,but also want to display it, what should I do? thank you very much
To be precise, this is not about lines but about statements. You can have the whole if else
statement in one line:
> if (TRUE) 1 else 3
[1] 1
A statement will end at the end of the line (if complete), you can see that nicely in interactive mode if you enter the code line by line:
> if (TRUE)
+ 1
[1] 1
> else
Fehler: Unerwartete(s) 'else' in "else" # error: unexpected 'else' in "else"
> 3
[1] 3
if
can come in form if (condition) statement
or if (condition) statement else other.statement
, the interpreter assumes the first version is meant if the statement is complete after line 2 - in interactive mode it cannot sensibly wait whether an else
appears next. This is different in source
d code - there it is clear with the next line which form it is.
Semicolons end statements as well:
> if (TRUE) 1; else 3
[1] 1
Fehler: Unerwartete(s) 'else' in " else" # error: unexpected 'else' in "else"
But you can only have one statement in each branch of the condition.
> if (TRUE) 1; 2 else 3
[1] 1
Fehler: Unerwartete(s) 'else' in " 2 else" # error: unexpected 'else' in "2 else"
Curly braces group statements so they appear as one statement.
> if (TRUE) {1; 2} else 3
[1] 2