uses crt;
var i,j:byte;
begin
clrscr;
writeln('Цикл for:');
for i:=0 to 50 do
for j:=0 to 20 do
if i*2+j*5=100 then
writeln(i,' - ',j);
write('Нажмите Enter...');
readln;
clrscr;
writeln('Цикл while:');
i:=0;
while i<=50 do
begin
j:=0;
while j<=20 do
begin
if i*2+j*5=100 then
writeln(i,' - ',j);
j:=j+1;
end;
i:=i+1;
end;
write('Нажмите Enter...');
readln;
clrscr;
writeln('Цикл repeat:');
i:=0;
repeat
j:=0;
repeat
if i*2+j*5=100 then
writeln(i,' - ',j);
j:=j+1;
until j>20;
i:=i+1;
until i>50;
write('Нажмите Enter...');
readln;
end.