CODE EXAMPLE FOR JAVASCRIPT

if else if

        var a = prompt("Enter s for squareEnter t for triangle")

        if (a=="s", a=="S"){
            var side = prompt("enter the value")
            var b = side *side;
            console.log(b,"this is square area")
        }
        else if(a=="t", a=="T"){
            var base = prompt("enter the base value")
            // base = 1/2;
            var height = prompt("enter the height")
            area=1/2*base*height;
            console.log(area,"this is the area of triangle")
        }
        else{console.log("invalid input")};