C Programming language Evolution: ALGO->BCPL->B->Tradition C-> K&R C-> ANSI C-> ANSI/ISO C-> C99.
The first programming language for the computer was Plankalkul, but C language is seen as the first high-level programming language.
Most popular Linux Kernel and most UNIX utilities, what you would call the operating system are written in C, In other words: Kernel of a most popular operating system Linux is written in C.
Windows, Linux, Android, Mac, Games all are in C.
The languages like Python, PHP etc. they are all developed in C.
Top Software/IT Companies Like Google, Facebook, Microsoft, RedHat, Apple, Intel uses C Language for their Drivers/Software.
Apple: The operating system is written in C.
Windows OS is also written in C Langugae.
In C language We can not apply the modulo (%) operator to floating-point values.
We can run our program without using header file if we save it with an extension .c in Turbo C++ IDE.