Function keys are some special keys on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions. On some keyboards/computers, function keys may have default actions, accessible on power-on. Function keys are normally labeled F1 to F10 or F12 (or F15 on Macintoshes).

FORTRAN Assembly Program (FAP) was a macro FORTRAN assembler for the IBM 709, 7090, and 7094 computers of the 1950s and 60s.

Federation Against Software Theft(FAST) is a non-profit organisation, formed in 1984 by the software industry with the aim of eradicating software theft in the UK. In addition to prosecuting organisations and individuals for software theft, FAST set up a campaign of public education and awareness to ensure that users of commercial software understand the effects of software theft. FAST gives a member organisation, which has signed a Code of Ethics and is committed to the carrying out of a regular software audit, a period of grace before bringing action if there is evidence of irregularities by the member organisation.

FastCAD is a 2D and 3D Computer Aided Design (CAD) program for Windows, which uses FCW as the file extension. It includes 3d modeling and rendering, symbol definition editing, and advanced capabilities for working with multiple drawings and overlays. FastCAD is written in assembler and will run well on basic hardware.

File Allocation Table (FAT) is file system developed by Microsoft for MS-DOS and is the primary file system for consumer versions of Microsoft Windows up to Windows Me. The FAT file system is an ideal format for floppy disks and solid-state memory cards, and a convenient way of sharing data between disparate operating systems installed on the same computer (a dual boot environment). FAT is replaced by New Technology File System (NTFS) since the release of Windows NT.

A fat binary, also known as multiarchitecture binary, is a computer program that is native to multiple instruction set architectures (ISA) and thus can be run on multiple processor types. The usual method of implementation is to include a version of the machine code for each ISA, resulting in a file n times larger than a normal one-architecture binary.

Fetch-and-add CPU instruction is a special instruction that automatically modifies the contents of a memory location. It is used to implement Mutual exclusion and concurrent algorithms in multiprocessor systems.

Fibonacci number program is a popular program in many beginning computer science courses, introducing the concept of recursion by calculating and printing the Fibonacci numbers. In general, however, a recursive algorithm to compute Fibonacci numbers is extremely inefficient when compared to other algorithms, such as iterative or matrix equation algorithms.

Fibonacci number program is a popular program in many beginning computer science courses, introducing the concept of recursion by calculating and printing the Fibonacci numbers. In general, however, a recursive algorithm to compute Fibonacci numbers is extremely inefficient when compared to other algorithms, such as iterative or matrix equation algorithms.

In mathematics, the Fibonacci numbers is a sequence of numbers defined recursively by the Fibonacci rule: after two starting values, each number is the sum of the two numbers before it. For example, the first Fibonacci numbers for n = 0, 1, 2, 3, … are 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, …