Actual parameter

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In computer science, an actual parameter is a name or value passed to a subroutine. This is in contrast to a formal parameter, which is the name by which the subroutine refers actual parameter. For example, in C,

int foo(int a)
   int b = 5;

   return a + b;

int bar(void)
   return foo(1);

The subroutine bar() calls foo(). When bar() calls foo(), it passes the constant 1. Within bar(), 1 is an actual parameter to foo(). Within foo(), a is a formal parameter which references the actual parameter 1 from bar().