Add Num .round

AUTHORS

@@ -19,3 +19,4 @@ Will Speak <will@willspeak.me>
 Damien Radtke <damienradtke@gmail.com>
 Max Ferguson <maxxferguson@gmail.com>
 Sven Bergström <sven@underscorediscovery.com>
+Kyle Charters <kylewcharters@gmail.com>

doc/site/modules/core/num.markdown

@@ -97,6 +97,15 @@ The natural logarithm of the number.
 
 Raises this number (the base) to `power`. Returns `nan` if the base is negative.
 
+### **round**
+
+Rounds the number to the nearest integer.
+
+    :::wren
+    System.print(1.5.round)    //> 2
+    System.print((-3.2).round) //> -3
+    System.print((-3.7).round) //> -4
+
 ### **sin**
 
 The sine of the number.

src/vm/wren_core.c

@@ -593,6 +593,7 @@ DEF_NUM_FN(ceil,    ceil)
 DEF_NUM_FN(cos,     cos)
 DEF_NUM_FN(floor,   floor)
 DEF_NUM_FN(negate,  -)
+DEF_NUM_FN(round,   round)
 DEF_NUM_FN(sin,     sin)
 DEF_NUM_FN(sqrt,    sqrt)
 DEF_NUM_FN(tan,     tan)
@@ -1270,6 +1271,7 @@ void wrenInitializeCore(WrenVM* vm)
   PRIMITIVE(vm->numClass, "cos", num_cos);
   PRIMITIVE(vm->numClass, "floor", num_floor);
   PRIMITIVE(vm->numClass, "-", num_negate);
+  PRIMITIVE(vm->numClass, "round", num_round);
   PRIMITIVE(vm->numClass, "sin", num_sin);
   PRIMITIVE(vm->numClass, "sqrt", num_sqrt);
   PRIMITIVE(vm->numClass, "tan", num_tan);

test/core/number/round.wren

@@ -0,0 +1,8 @@
+System.print(123.round)      // expect: 123
+System.print((-123).round)   // expect: -123
+System.print(0.round)        // expect: 0
+System.print((-0).round)     // expect: -0
+System.print(0.123.round)    // expect: 0
+System.print(12.3.round)     // expect: 12
+System.print((-0.123).round) // expect: -0
+System.print((-12.3).round)  // expect: -12