You are given an array of 20 elements, filled with random numbers ranging from -10 to +10.

You are given an array of 20 elements, filled with random numbers ranging from -10 to +10. Swap odd and even elements and display them on the screen.

program zz1;
const n = 20; // set the number of elements in the array
var i, s: integer; // set variables of integer type
m: array [1..n] of integer;
begin
for i: = 1 to n do // get n random numbers and write them into an array
m [i]: = random (21) -10;
for i: = 1 to n do // display the original array on the screen
write (m [i], ”);
writeln; // go to a new line to display the response
for i: = 1 to n-1 do
begin
if i mod 2 = 1 then begin s: = m [i]; m [i]: = m [i + 1]; m [i + 1]: = s; end;
end;
for i: = 1 to n do // display the resulting array on the screen
write (m [i], ”);
end.