Laita kohtaan, johon haluat laskimen
Valitse kaikki <SCRIPT LANGUAGE="JavaScript"> var lauseke = ""; // laskettava matemaattinen lauseke var operaattorit = "/*-+"; function on_operaattori(merkki) { if (operaattorit.indexOf(merkki) == -1) return false; else return true; } function poista_valilyonnit(mj) { var uusi=""; for (i=0; i<mj.length; i++) { if (mj.charAt(i) != ' ') { if (uusi.length == 0) uusi = mj.charAt(i); else uusi += mj.charAt(i); } } return uusi; } function lisaa(mj) { var arvo = poista_valilyonnit(mj); var edellinen = lauseke.charAt(lauseke.length-1); if (on_operaattori(edellinen) && on_operaattori(arvo)) { return false; } else if (edellinen == "." && arvo == ".") { return false; } lauseke += arvo; document.forms[0].lause.value = lauseke; return true; } function lisaa_funktio(mj, selite) { var arvo = poista_valilyonnit(mj); var edellinen = lauseke.charAt(lauseke.length-1); if (on_operaattori(edellinen)) { var luku = prompt("Anna " + selite + ">",""); if (isNaN(luku)) return false; lauseke += mj + "(" + luku + ")"; document.forms[0].lause.value = lauseke; return true; } else return false; } function poista_edellinen() { lauseke = lauseke.substring(0,lauseke.length-1); document.forms[0].lause.value = lauseke; return true; } function laske_tulos() { with (Math) { document.forms[0].tulos.value = eval(lauseke); } } </SCRIPT> <FORM> <INPUT TYPE="TEXT" NAME="lause" SIZE=40 MAXSIZE=60 onFocus='this.blur()'><BR> <INPUT TYPE="TEXT" NAME="tulos" SIZE=15 MAXSIZE=20 onFocus='this.blur()'><BR> <TABLE BORDER=0> <TR><TD><INPUT TYPE="BUTTON" VALUE=" 1 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" 2 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" 3 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" / " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" CLEAR " onClick= "lauseke = ''; this.form.tulos.value=''; this.form.lause.value='';"></TD> </TR> <TR><TD><INPUT TYPE="BUTTON" VALUE=" 4 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" 5 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" 6 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" * " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE="<--" onClick="poista_edellinen()"></TD> </TR> <TR><TD><INPUT TYPE="BUTTON" VALUE=" 7 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" 8 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" 9 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" - " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE="sqrt" onClick="lisaa_funktio(this.value,'neliöjuuri')"></TD></TR> <TR><TD><INPUT TYPE="BUTTON" VALUE=" 0 " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" . " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" = " onClick="laske_tulos()"></TD> <TD><INPUT TYPE="BUTTON" VALUE="+ " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE="sin" onClick="lisaa_funktio(this.value,'Sini')"></TD></TR> <TR><TD COLSPAN=3></TD><TD><INPUT TYPE="BUTTON" VALUE=" ( " onClick="lisaa(this.value)"></TD> <TD><INPUT TYPE="BUTTON" VALUE=" ) " onClick="lisaa(this.value)"></TD> </TR> </TABLE> </FORM>