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var r=0;
var pi=3.1416;
var area=0;
 
r=parseInt(prompt("¿Cuál es el radio?"));
area=pi*(r*r);
 
 
document.write("radio="+r+"<br>");
document.write("area="+area+"<br>");
 

Main.java:2: error: class, interface, or enum expected
var r=0;
^
Main.java:3: error: class, interface, or enum expected
var pi=3.1416;
^
Main.java:4: error: class, interface, or enum expected
var area=0;
^
Main.java:6: error: class, interface, or enum expected
r=parseInt(prompt("?Cu?l es el radio?"));
^
Main.java:7: error: class, interface, or enum expected
area=pi*(r*r);
^
Main.java:10: error: class, interface, or enum expected
document.write("radio="+r+"<br>");
^
Main.java:11: error: class, interface, or enum expected
document.write("area="+area+"<br>");
^
7 errors

Standard output is empty