Result Error same thing second JS problem !

//asks the user for a code letter then shows the manufacturing grade

var userInput = prompt ("Please enter your code letter here:", "");

if (userInput == "S" || "s")
{
document.write("Your manufacturing grade is Space Grade");
}

else if (userInput == "M" || "m")
{
document.write("Your manufacturing grade is Military Grade");
}

else if (userInput == "C" || "c")
{
document.write("Your manufacturing grade is Commercial Grade");
}

else (userInput == "T" || "t")
{
document.write("Your manufacturing grade is Toy Grade");
} 

PHP:

every time I try putting it to work I get the result of the first one "Your manufacturing grade is Space Grade" any letter or number I put is the same. I need help on what I am doing wrong here.

 

Your condition clauses are incorrect. You should use something like:

if ((userInput == "S") || (userInput == "s")) {

Code (markup):

and would be simpler if you used:

if (userInput.toUpperCase() == "S") {

Code (markup):

 

thanks mate got it to work.