Chapter 1, Problem 1.7PE

(Approximate π) π can be computed using the following formula:

$\pi =4\times \left(1-\frac{1}{3}+\frac{1}{5}-\frac{1}{7}+\frac{1}{9}-\frac{1}{11}+\cdots \right)$

Write a program that displays the result of $4\times \left(1-\frac{1}{3}+\frac{1}{5}-\frac{1}{7}+\frac{1}{9}-\frac{1}{11}\right)$ and $4\times \left(1-\frac{1}{3}+\frac{1}{5}-\frac{1}{7}+\frac{1}{9}-\frac{1}{11}+\frac{1}{13}\right)$. Use 1.0 instead of 1 in your program.