1-If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Similarly, Find the sum of all the multiples of 3 or 5 below 1000.

Note: Using Loop
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2-Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
		1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
		
Find the sum of all the even-valued terms in the sequence which do not exceed one million.

Note: To store the sum use long data type.

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3- Try the class program calculate the PI.

http://www.iitk.ac.in/esc101/current/Programs/calculating-pi.c