Ray-Tracing/Numbers.html at master · Antonc3/Ray-Tracing · GitHub

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<body>
  Number <input type="number" id="num1"> Base <input type="number" id="base1"> = <p id="output1">0</p>
  <br>
  Number <input type="text" id="num2"> Base <input type="number" id="base2"> = <p id="output2">0</p>
  <input type="button" onclick="update()" value="Update">
</body>
<script>

    function to_base(n,r){
      let converter = '0123456789abcdefghijklmnopqrstuvwxyz';
      let ans = '';
      let test = 1;
      if(r < 2 || r > converter.length){
        return 'Not possible';
      }
      if(n == 1){
        return '1';
      }
      while(test < n){
        test = test*r;
      }
      while(test > 1){
        test = test/r;
        let temp = Math.floor(n/test);
        if(temp*test == test*r){
          console.log('here');
          ans+='1';
          n-=(temp*test);
          test*=r;
        }
        else{
          ans+=converter[temp];
          n-=(temp*test);
        }
      }
      return ans;
    }
    function from_base(n, r){
      let converter = '0123456789abcdefghijklmnopqrstuvwxyz';
      let ans = 0;
      let tempr = 1;
      for(let i = n.length-1; i >= 0; i--){
        if(r <= converter.indexOf(n[i])){
          return 'not possible';
        }
        ans += converter.indexOf(n[i]) * tempr;
        tempr *= r;
      }
      return ans;
    }
    function test(n, r) {
        let s = to_base(n, r);
        console.log('to_base',n, r, s);
    }
    function test2(n,r){
      let s = from_base(n,r);
      console.log('from_base',n,r,s);
    }
    function update(){
      let n = document.getElementById("num1").value;
      let r = document.getElementById("base1").value
      document.getElementById("output1").innerHTML = to_base(n,r);
       n = document.getElementById("num2").value;
       r = document.getElementById("base2").value
      document.getElementById("output2").innerHTML = from_base(n,r);
    }
</script>