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.
More than 90% of annual knee replacements are total knee replacements (TKR). As the name suggests, in a total knee replacement all of the cartilage and bone that has been damaged from osteoarthritis (or otherwise) is resurfaced. In this resurfacing the damaged cartilage and small amounts of bone are removed.