Формула для вычисления площади прямоугольника является примером...модели.
2)знаковой
var
i, b: integer;
begin
b := 0;
for i := 1 to 100 do
if (i mod 2 <> 0) then b := b + i;
writeln(b);
end.
Uses crt;
var input, betw:integer;
begin
readln(input);
betw := input;
betw := betw div 10;
betw := betw div 10;
betw := betw div 10;
writeln('Тысяч = ', betw);
betw := input;
betw := betw div 10;
betw := betw div 10;
betw := betw mod 10;
writeln('Сотен = ', betw);
betw := input;
betw := betw div 10;
betw := betw mod 10;
writeln('Десятков = ', betw);
betw := input;
betw := betw mod 10;
writeln('Единиц = ', betw); end.
<span>Программа считает сумму последних трех цифр:
<em><u>Pascal:</u></em>
var n:longint;
sum,i:integer;
begin
repeat
write ('N = ');
readln (n):
until (n>=10000) and (n<=99999);
sum:=0;
for i:=1 to 3 do
begin
sum:=sum+(n mod 10);
n:=n div 10;
end;
writeln ('Summa: ',sum);
end.
<u><em>C++:</em></u>
#include <iostream></span>
<span>using namespace std;</span><span>
int main()</span><span>
{
</span><span>
int n,sum = 0;</span><span>
do</span><span>
{
</span><span>
cout <<"N = ";</span><span>
cin >>n;
}
</span><span>
while (n<10000 || n>99999);</span><span>
for (int I = 1; I<=3; I++)</span><span>
{
sum+=n%10;
n/=10;
}
</span><span> cout <<"Summa: " <<sum <<endl;</span><span>
return 0;</span><span>
}</span>
Если не ошибаюсь,то так))