Make New Function On C Programming Language

Function is part of program to work specific task and its place is separate with program who call it. On C programming language, function can be grouped into two, are library function or function has been available on Turbo C and function is made by self. Syntax for a function is:

type_output_function name_of_fungsi(fungsi_parameter_variable);
{
  ...
}

Function is made by self placed before main() function, so that program syntax will look:

type_output_function name_of_fungsi(fungsi_parameter_variable);
{
  ...
}

main()
{
  ...
}

Example we want to make function of addition 2 integers. Output type = int, example name of function is w, parameter variables: int x dan int y, so that its syntax is:

int w(int x, int y)
{
  int z;
  z=x+y;
}

main()
{
  int a,b,c;

  a=1;b=2;
  c=w(a,b);
  printf("%d",c);

  getch();
}

On the example above, w function is called by c variable, w function can be used more than once by different variable:

int w(int x, int y)
{
  int z;
  z=x+y;
}

main()
{
  int a,b,c,d,e,f;

  a=1;b=2;
  c=w(a,b);
  printf("%d",c);

  d=17;e=10;
  f=w(d,e);
  printf("\n%d",f);

  getch();
}

On this example, w function is called twice

But when be tried to clear type_output_function so that program syntax becomes:

w(int x, int y)
{
  int z;
  z=x+y;
}

main()
{
  int a,b,c,d,e,f;

  a=1;b=2;
  c=w(a,b);
  printf("%d",c);

  d=17;e=10;
  f=w(d,e);
  printf("\n%d",f);

  getch();
}

in fact, program is still normal and accurate,

Hopefully useful...

Reference: Thanks to http://onestring.wordpress.com

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