CODEWITHSUNDEEP
javascriptvariablesequation
Lawnmoers The Epic Gamer
Lawnmoers The Epic Gamer

Reputation: 27

How do I take an equation from a string and solve it then put the answer back into a string in javascript?

So i have a variable lets call that, equation. Which in this case is a string that means "5+10". How do write some code to solve that then put it back into a string to print back to the user?

Upvotes: 1

Views: 52

Answers (1)

Kingslayer47
Kingslayer47

Reputation: 493

This might help

function Calculate(){
  var n1 = document.getElementById("n1").value
  var n2 = document.getElementById("n2").value
  var op = document.getElementById("op").value
  var ans = document.getElementById("ans")
  
  switch(op){
  case '+':
    ans.value = parseFloat(n1) + parseFloat(n2);
    break;
   case '-':
    ans.value = parseFloat(n1) - parseFloat(n2);
    break;
  case '*':
    ans.value = parseFloat(n1) * parseFloat(n2);
    break;
  case '/':
    ans.value = parseFloat(n1) / parseFloat(n2);
    break;
  default:
    ans.value = "Invalid Operator";
    break;
  }
}
<p><input type="number" id="n1" style="text-align:center;" placeholder="Enter 1st Number" minimum="0" value="0"  oninput="Calculate()" > 
<input type="string" max-length="1" id="op" size="5px" style="text-align:center;" placeholder="Operator"  oninput="Calculate()"> 
<input type="number" id="n2" oninput="Calculate()" placeholder="Enter 2nd Number" minimum="0" value="0" style="text-align:center;" ></p>
<input type="disabled" id="ans"  placeholder="Answer" style="text-align:center;" >

Upvotes: 1

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