In the 1970s, Dennis Ritchie Invented C programming language using Unix Operating system. C is being a high-level programming language.

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In the 1970s, Dennis Ritchie Invented C programming language using Unix Operating system. C is being a high-level programming language.
Basic structure of C programming. To write a C program, we first create functions and then put them together. A C program may contain one or more sections. They are illustrated below.
Functions can be classified into two categories, namely, library functions and user-defined functions. The functions which are developed by user at the time of writing a program are called user defined functions. Thus, user defined functions are functions written by developer
Counter controlled loops are where we know the number of loop executions beforehand. Unlike counter controlled loops, in sentinel controlled loops the number of loop executions in unknow at the beginning and depends on decisions made inside the loop.
Based on the nature of the control variable and the condition or limit, the loops can be of two general categories; counter controlled and sentinel controlled loops. Counter controlled loops are where we know the number of loop executions beforehand. Unlike counter controlled loops, in sentinel controlled loops the number of loop executions in unknow at the beginning and depends on decisions made inside the loop.