Week 3: Friday
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Q1. (50)

Write a program using the function getchar() that inputs a real number, adds 5
to it and prints it using putchar(). You are not allowed to use scanf or printf.
You can use ascii code information to convert characters to integers.

Example:
If input is
-23.45
output is
-18.45

Q2. (50)

Input 10 numbers and output their variance.  The variance is calculated as
sum(|x_i - average|^2)/n for n numbers x_0, ..., x_{n-1}.
Example: If input is 1 2 3, output is 0.67.