How to display "-¹" at screen

Question

The unit of velocity, ms-¹, "-¹" is replaced by some ASCII code. How can I really display "-¹" at the screen ?
https://code.sololearn.com/cg36Pdz3AC6e/?ref=app

Answer 1

search for ASCII table and google and for displaying the specific character use :
char(num);
where num is a integer that specifies the ASCII value of the character .
or you can simply get the ASCII table here :
https://code.sololearn.com/cS1H39xtdppA/?ref=app

Answer 2

// In html

<p>ms^-1</p>
// prints ms-¹