Calculator in javascript, subtract instead of adding

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Calculator in javascript, subtract instead of adding

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#1 by (2 votes)
#2 by (0 votes)

2

It's a simple calculator, only with javascript. Adding does it without problem, but when I want to subtract, add.

var eleccion = prompt("Qué operación querés realizar? Las opciones son: Suma, Resta, Multiplicacion y Division")
var primer = prompt("Primer número?")
var segundo = prompt("Segundo número?")

if (eleccion == "Suma" || "suma") {
  document.write("El resultado es " + (Number(primer) + Number(segundo)))
} else if (eleccion == "Resta" || "resta") {
  document.write("El resultado es " + (Number(primer) - Number(segundo)))
}

javascript

asked by broadwaydannyrose 27.06.2018 в 00:59

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2 answers

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score 2 · Answer 1

You have a problem with your conditions. The correct way is like this:

var eleccion = prompt("Qué operación querés realizar? Las opciones son: Suma, Resta, Multiplicacion y Division")
var primer = prompt("Primer número?")
var segundo = prompt("Segundo número?")

    if (eleccion == "Suma" || eleccion == "suma"){  
        document.write("El resultado es " + (Number(primer) + Number(segundo)))}
    else if (eleccion == "Resta" || eleccion == "resta"){ 
        document.write("El resultado es " + (Number(primer) - Number(segundo)))}

score 0 · Answer 2

The first evaluation gives as true (true) always

if (eleccion == "Suma" || "suma"){

if eleccion equals "resta" the first part:

if (eleccion == "Suma"

will give false (false)

however the second part

 "suma"){

will give true (true), this together would be:

if (false || true){

If false or true, true