What are built in functions?

• built in functions are nothing but a template... these functions are created for compress the code........ no need to create our full code just call these built in functions whenever we need...... Ex: printf(),scanf(),strcpy(),strlen()...,
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• the function which are avaliabe along with the compiler is known as built in function
  for example
  printf(),scanf(),gets(),puts(),getch(),putch(),strlen().strcpy() etc.
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• built in functions are developed by programmers at the time of creating language. printf(),scanf(),clrscr(); these are the example of built in functions
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