The C standard library provides numerous built-in functions that your program can call. For example, strcat() to concatenate two strings, memcpy() to copy one memory location to another location, and many more functions. A function can also be referred as a method or a sub-routine or a procedure, etc.
Quick Answer. Authors use repetition for several reasons, including making a point, to set a rhythm, link topics or ideas and to make discussions easier to follow. Using repetition in writing is something that still has rules and should be used with some thought instead of randomly.
Sometimes you want a computer to repeat something over and over again. A loop is used to make a computer do something more than one time. One type of loop is the infinite loop. With an infinite loop, a computer keeps doing the same command again and again. The computer will keep repeating the command forever. You make an infinite loop with the while(true) instruction.