For some esoteric languages, the only means of input is reading individual bytes from stdin, and interesting golfing of numeric challenges is near impossible with decimal input, since 80% of your code will be implementing atoi().

If a challenge specifies that a program should take a number as input, can that number be taken as the value of a byte read from stdin?

For the purpose of this question, please assume that the limitations on the range of inputs is not an issue for the challenge in question.