658__________________Часть V. Разработка программ и написание скриптов

function deleteChar(input){

input.value= input.value.substring(0, input.value.length — 1);

function add(form){

form.display.value= parseFloat(form.stack.value)

+ parseFloat(form.display.value)computed= true;

function subtract(form){

form.display.value= form.stack.value

— form.display.value;

computed= true;

}

function multiply(form){

form.display.value= form.stack.value

* form.display.value;

computed= true;

}

function divide(form){

var divisor= parseFloat(form.display.value);

if (divisor==0){

alert("Don't divide by zero, pal[el]"if-return;

}

form.display.value= form.stack.value / divisor;

computed= true;

}

function changeSign(input){

if(input.value.substring(0, 1)=="-")

input.value= input.value.substring(1, input.value.length)else

input.valu ="-"+input.value