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Task/Price-fraction/Nim/price-fraction.nim

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+import strutils, math
+
+const
+  pricemap: array[0 .. 19, int] = [10,18,26,32,38,44,50,54,58,62,66,70,74,78,82,86,90,94,98,100]
+
+# outputs an int (=>float*100)
+proc floatToPrice100(f: float): int =
+    # indx: 0.1-0.05->0, 0.06-0.10->1, 0.11-0.15->2, .....
+    var valu: int = toInt(f*100)
+    if valu == 0:
+        result = 10
+    else:
+        dec(valu)
+        # inc indx every 5 of valu, so value of 1..100 translates to indx of 0..19
+        var indx: int = 2*int(valu/10)+int((valu%%10)/5)
+        result = pricemap[indx]
+
+# str representation of an int (that is a representation of a float price)
+proc price100ToStr(p: int): string =
+    if p < 10:
+       result = "0.0" & $p
+    if p < 100:
+       result = "0." & $p
+    else:
+       result = "1.00"
+
+randomize()
+var i: int = 0
+
+for x in 0 .. 10:
+   i = random(101)
+   echo("Price for ", i.price100ToStr(), ", is: ", float(i/100).floatToPrice100().price100ToStr())