awk - awk concatenate string variable

I would like to awk concatenate string variable in awk. How can I do that? I tried:

BEGIN{
t="."
r=";"
w=t+r
print w}

But I does't work. Output:

Or I want to add variable and result of function. Input:

t t t t
a t a ta
ata ta a a

Script:

{
key="t"
print gsub(key,"")#<-it's work
b=b+gsub(key,"")#<- it's something wrong
}
END{
print b}#<-so this is 0

Output:

4
2
2
0#<-the last print

1 Answer

No operator is needed (or used). Your example would be something like

BEGIN{
t="."
r=";"
w=t r
print w}

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