Natural Numbers can mean either Counting Numbers {1, 2, 3, ...}, or Whole Numbers {0, 1, 2, 3, ...}, depending on the subject. Integers. Integers are like whole numbers, but they also include negative numbers... but still no fractions allowed! So, integers can be negative {-1, -2,-3, -4, -5, ... }, positive {1, 2, 3, 4, 5, ... }, or zero {0} We can put that all together like this: Integers = { ..., -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, ...
An application-programming interface (API) is a set of programming instructions and standards for accessing a Web-based software application or Web tool. A software company releases its API to the public so that other software developers can design products that are powered by its service. For example, Amazon.com released its API so that Web site developers could more easily access Amazon's product information.
1.12. The provides an interface to the operating system services. Application developers often do not have direct access to the system calls, but can access them through an application programming interface (API). The functions that are included in the API invoke the actual system calls. By using the API, certain benefits can be gained: 1  Portability: as long a system supports an API, any program using that API can compile and run. 2  Ease of Use: using the API can be significantly easier then using the actual system call.