Write a program: Calculate the sum of even and odd numbers separately, entered from the keyboard.

program zz1;

var n, a, s1, s2, i: integer; // introduce variables of integer type

begin

write (‘enter a number’); // enter the number of entered numbers from the keyboard

read (n);

for i: = 1 to n do

begin

read (a);

if a mod 2 = 0 then s1: = s1 + a else s2: = s2 + a;

end;

writeln (‘the sum of even numbers =’, s1);

write (‘sum of odd numbers =’, s2);

end.