How to install GCC 4.7 in Ubuntu 12.04

How to Install GCC 4.7 in Ubuntu 12.04
You can try this PPA (https://launchpad.net/~ubuntu-toolchain-r/+archive/test) for installing gcc 4.7.
 Note that it has packages only for 12.04

Open a terminal and run the following commands

$ sudo add-apt-repository ppa:ubuntu-toolchain-r/test
$ sudo apt-get update
$ sudo apt-get install gcc-4.7