@@ -57,7 +57,7 @@ <h1 class="Heading-1"> <font color="#0000A0">Math Functions</font></h1>
         ceil(x)&nbsp;&nbsp;&nbsp;&nbsp;# round up to nearest integer<br />
         floor(x)&nbsp;&nbsp;&nbsp;# round down to nearest integer<br />
         sign(x)    &nbsp;&nbsp;&nbsp;# +1 if x &gt; 0, -1 if x &lt; 0, 0 if x == 0<br />
-        round(x)   &nbsp;&nbsp;# round to nearest integer <br />
+        round(x,N)&nbsp;# round x to nearest integer; optional N decimal places&nbsp; <br />
         max(x,y,z) # the largest of x,y,z<br />
         min(x,y,z) # the smallest of x,y,z<br />
         random()   &nbsp;&nbsp;# pseudorandom number 0 to 1<br />
 
@@ -225,6 +225,7 @@ where compile() was called, in untrusted/run.js.
 	var delim = '"'
 
 	var lineno_string = 'ρσ_ls = ' // prepended to quoted line number; used in error return
+	let language = null
 
 	function findrightparen(s) { // s is a string starting with '('; return location of matching ')' or null
 		// The string may contain string_insert, which represents (.
@@ -243,6 +244,7 @@ where compile() was called, in untrusted/run.js.
 	}
 
 	function preprocess(program, lang) { // manipulate the program source
+		language = lang
 		// The preprocessing includes inserting ρσ_ls = "line number" to enable error reporting of original source line
 		if (lang == 'rapydscript') throw new Error("GlowScript RapydScript is not available after GlowScript 2.9.Choose GlowScript VPython instead.")
 		if (lang == 'vpython') classinstances.push('self')
@@ -1244,6 +1246,12 @@ where compile() was called, in untrusted/run.js.
 
 		let s = "scene = canvas();\n"
 		let sc = program.indexOf(s) + s.length
+
+		if (language == 'vpython' && program.indexOf('round') >= 0) { // JavaScript Math.round has only 1 argument
+			let ls = "\n    function round(num, n=0) {return Number(num.toFixed(n))}\n"
+			program = program.slice(0,sc)+ls+program.slice(sc,program.length)
+			sc += ls.length
+		}
 
 		if (loadfonts) { // if text object is in user program
         	s = "    fontloading();\n    await waitforfonts();\n"  // wait for font files
@@ -1277,7 +1285,7 @@ where compile() was called, in untrusted/run.js.
 		// let i = program.search('"2";')
 		// let i = program.search('async function __main__')
 		// console.log(program.slice(i))
-		//console.log(program)
+		console.log(program)
 		return program
     } // end of compile function
     window.glowscript_compile = compile