# [PseudoD](http://github.com/alinarezrangel/PseudoD), <s>688</s> 579 bytes

    utilizar mate.pseudo
    utilizar entsal.pseudo
    adquirir n
    adquirir a
    adquirir r
    adquirir i
    fijar n a llamar LeerPalabra finargs
    si son iguales n y CERO
    llamar EscribirLinea {0} finargs
    salir
    fin
    fijar a a llamar ValorAbsoluto n finargs
    fijar i a CERO
    si comparar Importar.Ent.Comparar n < CERO
    fijar r a {~}
    sino
    fijar r a {-}
    fin
    mientras comparar Importar.Ent.Comparar i < a
    llamar Escribir r finargs
    si son iguales r y {~}
    fijar r a {-}
    Importar.Ent.Sumar i UNO i
    sino
    fijar r a {~}
    fin
    finbucle
    si son iguales r y {~}
    llamar Escribir {~} finargs
    fin
    llamar Escribir {0} finargs

Explain:

    Read a number from STDIN;
    If the number is zero (0); Then:
        Writes 0 to STDOUT and exits;
    End If;
    If the number is less than zero (0); Then:
        Set the fill character to "~";
    Else:
        Set the fill character to "-";
    End If;
    For i = 0; While i is less than abs(number); do:
        Write the fill character to STDOUT;
        If the fill character is "~":
            Set the fill character to "-"
            Increment i by one
        Else:
            Set the fill character to "~"
        End if;
    End for;
    If the fill character is "~"; Then:
        Write "~" to STDOUT;
    End If;
    Write "0" to STDOUT