将数组传递给子程序（Passing arrays to subprograms）

Pascal允许将数组作为子程序参数传递。 以下函数将数组作为参数，并返回通过数组的数字的平均值，如下所示 -

program arrayToFunction;
const
   size = 5;
type
   a = array [1..size] of integer;
var
   balance:  a = (1000, 2, 3, 17, 50);
   average: real;  
function avg( var arr: a) : real;
var
   i :1..size;
   sum: integer;
begin
   sum := 0;
   for i := 1 to size do
      sum := sum + arr[i];
   avg := sum/size;
end;
begin  
   (*  Passing the array to the function  *)
   average := avg( balance ) ;
   (* output the returned value *)
   writeln( 'Average value is: ', average:7:2);
end.

编译并执行上述代码时，会产生以下结果 -

Average value is: 214.40