R语言 一个条件句 if or else if or else各可以使用多少次?

For instance:

for i in................
{if(i == 1)
{
}
else if(i == 2)
{
}
else
{
}

like this form, but I have many conditions, I don't kown can I add else if or else many times?

http://www.phperz.com/article/16/0102/180149.html