If an integer value is to be entered through keyboard for direct arithmetic operation, what function should be use? gets,scant ?

Question

If an integer value is to be entered through keyboard for direct arithmetic operation, what function should be use?
gets()
getchar()
scanf()
getstring()

Answer 1

If you mean to read the input as an expression e.g. "5*4/3-2+1", rather than numbers then you can use scanf() with %s as format specifier. Having a sufficient sized buffer prepared, you can read the input as string (char array) then you can parse the expression and process them piece by piece.

I read somewhere that gets() is considered unsafe, and getstring() is non standard (cmiiw).

Answer 2

gets()