Add 'round' function to builtin math

src/tinyexpr.c

@@ -150,6 +150,7 @@ static const te_variable functions[] = {
     {"npr", npr,      TE_FUNCTION2 | TE_FLAG_PURE, 0},
     {"pi", pi,        TE_FUNCTION0 | TE_FLAG_PURE, 0},
     {"pow", pow,      TE_FUNCTION2 | TE_FLAG_PURE, 0},
+    {"round", round,  TE_FUNCTION1 | TE_FLAG_PURE, 0},
     {"sin", sin,      TE_FUNCTION1 | TE_FLAG_PURE, 0},
     {"sinh", sinh,    TE_FUNCTION1 | TE_FLAG_PURE, 0},
     {"sqrt", sqrt,    TE_FUNCTION1 | TE_FLAG_PURE, 0},

tests/math.err

@@ -2,6 +2,9 @@
 ####################
 # Validate basic expressions
 
+####################
+# Validate some rounding functions
+
 ####################
 # Validate some integral computations
 

tests/math.in

@@ -15,6 +15,10 @@ math 5 \* -2
 math -- -4 / 2
 math -- '-4 * 2'
 
+logmsg Validate some rounding functions
+math 'round(3/2)' ; math 'floor(3/2)' ; math 'ceil(3/2)'
+math 'round(-3/2)' ; math 'floor(-3/2)' ; math 'ceil(-3/2)'
+
 logmsg Validate some integral computations
 math 1
 math 10

tests/math.out

@@ -17,6 +17,15 @@
 -2
 -8
 
+####################
+# Validate some rounding functions
+2
+1
+2
+-2
+-2
+-1
+
 ####################
 # Validate some integral computations
 1