2. Data Input/Output

• In order to write useful programs, we need to be able to handle console input and output.

• For example, a typical numeric input function

  1. Accepts a string of character codes representing a number.

  2. Converts the characters to a 2's complement in a register.

  3. Stores the value in a memory location associated with some variable name.

• A numeric output function

  1. Starts with a 2's complement number in a register.

  2. Converts value to a string of characters that represent the number.

  3. Outputs the string.