C Program executes sequentially i.e. line after line but we can change this pattern by entering some condition in it. So, if we put some condition then the flow of execution changes i.e. conditions are checked and then executed accordingly. If the condition found true the statements in conditional area will be executed otherwise it will leave the conditional area and will execute the code next to if skeleton.
C is a general-purpose, procedural computer programming language supporting structured programming, lexical variable scope, and recursion, with a static type system. It was developed in 1972 by Dennis M. Ritchie at the Bell Telephone Laboratories to develop the UNIX operating system.