var x=3;  
var y=-7;  
var z=2;  
if (x>0 && y>0 && z>0)  
{  
       alert("The sign is +");  
}  
else if (x<0 && y<0 && z>0)  
        {  
          console.log("The sign is +");  
        }  
        else if (x>0 && y<0 && z<0)  
        {  
          console.log("The sign is +");  
        }  
        else if (x<0 && y>0 && z<0)  
        {  
          console.log("The sign is +");  
        }  
        else  
        {  
          console.log("The sign is -");  
        }  