Standard library functions. The standard library functions are built-in functions in C programming to handle tasks such as mathematical computations, I/O processing, string handling etc. These functions are defined in the header file. When you include the header file, these functions are available for use.
Knee replacement. Knee replacement, also known as knee arthroplasty, is a surgical procedure to replace the weight-bearing surfaces of the knee joint to relieve pain and disability. It is most commonly performed for osteoarthritis,[1] and also for other knee diseases such as rheumatoid arthritis and psoriatic arthritis.
The knee is made up of three areas: medial and lateral (the sides of your knee) and patella (the knee cap). When fewer than three of these areas need to be replaced, it is called a unicompartmental or partial knee replacement. By replacing only the damaged areas, you are able to retain more of your own natural knee.