Prompt of javascript.

// per=prompt("Enter your exam percentage.") // if(per>= 80 && per<= 100){document.write("You are in first merit.");} // else if(per>= 60 && per< 80){document.write("You are in second merit.");} // else if(per>= 55 && per< 60){document.write("You are in third merit.");} // else if(per>= 45 && per< 55){document.write("You are in fourth merit.");} // else if(per<= 33) {document.write("You are fail.");} // else{document.write("You have entered invalid percentage.");} a=prompt("welcome to my coding of javascript.") if (a) {document.write("Thanks"); } else {document.write("Sorry") }