Question

Giúp mình với ạ

Answer 1

const fi='dulieu.txt'

fo='ketqua.txt'

var f1,f2:text;

m,n,i,t:integer;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

readln(f1,m,n);

t:=0;

for i:=m to n do 

 if i mod 3=0 then t:=t+i;

writeln(f2,t);

close(f1);

close(f2);

end.