Counting String Variable

[Jahan zee]

I have string variable curcd. there are two things in it USD or CAD, How can I calculate No of CAD and how can I delete those. codes which I normally use for a numeric variable are not working.
Moreover, how can I create another variable by using it (gen country=1 if curcd==CAD)
count if curcd==CAD
drop of curcd==CAD

* Example generated by -dataex-. To install: ssc install dataex
clear
input str4 curcd
"CAD"
"USD"
"CAD"
"CAD"
"CAD"
"USD"
"CAD"
"CAD"
"CAD"
"CAD"
end

[Red Owl]

count if curcd=="CAD"

The value is also stored in the macro r(N).

display r(N)

To create a new variable:

gen newvar = 0
replace newvar = curcd=="CAD"

Red Owl

[Clyde Schechter]

There are at least two quick ways to get the number of CAD:

tab curcd // GIVES A TABLE WITH # OF EACH

count if curcd = "CAD"

how can I delete those. codes which I normally use for a numeric variable are not working.

I don't understand which codes you normally use for a numeric variable, nor is it clear in what sense it is not working.

Also not clear what you are asking in the rest of your post, but:

gen byte country = (curcd == "CAD")

will create a new variable whose value is 1 in those observations where curcd is "CAD" and 0 in the other observations.

count if curcd==CAD

is a syntax error because curcd is a string variable, and CAD is a value of, not the name of, a variable, so CAD has to be bound in quotation marks.

drop of curcd == CAD

contains two syntax errors. of should be if. (I imagine that was just a typo.) And,once again, CAD must be bound in quotation marks.

Added: Crossed with #2.