1) Write a program to make commandline calculator ?

    Format like that : excutablefile  firstoperand opertator secondoperand 
                  Ex : ./a.out              1       +               3 

                            result : 5 
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what exactly you want to do ?

how to solve

Start by trying something on your own or asking a specific question. We're not here as a free homework writing service.

What numeric system do you know where 1 + 3 = 5?

What numeric system do you know where 1 + 3 = 5?

It's obvious -- for large values of 1 & 3 and small values of 5! ;o)