Learning C

If you want to learn C,

1) http://www.physics.drexel.edu/courses/Comp_Phys/General/C_basics/

2) 

Entry to C++:

If you are learning C++ for the first time. Here are some great website I found on web:

Tutorials
1) www.learncpp.com:
This is my favourite one. It is easy to understand

2) WiBit.net
Another great website with video explanations