problem in expr 3+5

[sanjay123456]

Dear friends ,

i am using shell script and file name is test.sh

and in test.sh i am written echo expr 3+5;

excution of this programe result is 3+5 its not give 8

so plz tell me where its wrong ???????????

sanjay

[radoulov]

echo $(expr 3 + 5)

Or just:

echo $((3+5))

Or (for older, older shells):

echo `expr 3 + 5`