Description: Requirements in this case determine the type of keyboard input characters. Can input ASCII characters to determine the type of code. ASCII code table, we can see by the ASCII value for the control of less than 32 characters. In " 0" and " 9" between the digital, in the " A" and " Z" between the capital letters in the " a" and " z" for the lowercase letters between, while the rest is the other characters. This is a choice of multi-branch, the if-else-if statements programming, ASCII character code input to determine the scope of which were given different output. For example, input for the " g" , the output shows that it is lower-case characters.
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