sql server - T-SQL Stored Procedure returned value into variable -

i have simple stored procedure on ms sql 2012 express returns result doing :

declare @value int; select @value;

meanwhile trying call stored procedure doing like

declare @result int; exec @result = spfoo .....

however value on @result spfoois 0.

how can real value returned stored procedure?

thanks

first declare @value output parameter in called sp

create procedure spcallee @value int output begin     set @value = 1  end go

get result in caller sp

create procedure spcaller begin      declare @result int = 0      exec spcallee @value = @result output      select @result end go

for reference

Call