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Var
    a, b: integer;

function greatest_common_divisor(m, n: integer): integer;
var
    modulo: integer;
begin
    modulo := m mod n;
    if modulo = 0 then
        greatest_common_divisor := n
    else
        greatest_common_divisor := greatest_common_divisor(n, modulo)
end;

procedure reduce_the_fraction(a, b: integer);
var
    gcd: integer;
    sign: string;
begin
    gcd := greatest_common_divisor(a, b);
    if a * b < 0 then
        sign := '-';
    writeln(sign, abs(a) / gcd, '/', abs(b) / gcd);
end;

begin
    write('Enter two numbers: ');
    readln(a, b);
    reduce_the_fraction(a, b);
end.

1.
Числа можно вводить
int k,l; cout<<"->"; cin>>k>>l; if (k==l) { k=0; l=0; cout<<k<<" "<<l<<endl; }  else   {  l=k;  cout<<k<<" "<<l<<endl;  }
если хочешь без ввода удали cin и присвой значения

2.
int k,l,z; cout<<"->"; cin>>k>>l>>z;  if (k>0)  {  k*=k;  cout<<k<<endl;  }   if (l>0)  {  l*=l;  cout<<l<<endl;  }   if (z>0)  {  z*=z;  cout<<z<<endl;  }   if (k<0)  {  cout<<k<<endl;  }   if (l<0)  {  cout<<l<<endl;  }   if (z<0)  {    cout<<z<<endl;  }