Create convert_number_to_words.py (#6788)

* Create convert_number_to_words.py

A Python Program to convert numerical digits to English words. An Application of this can be in a Payment Application for confirmation

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web_programming/convert_number_to_words.py

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+import math
+
+
+def convert(number: int) -> str:
+    """
+    Given a number return the number in words.
+
+    >>> convert(123)
+    'OneHundred,TwentyThree'
+    """
+    if number == 0:
+        words = "Zero"
+        return words
+    else:
+        digits = math.log10(number)
+        digits = digits + 1
+        singles = {}
+        singles[0] = ""
+        singles[1] = "One"
+        singles[2] = "Two"
+        singles[3] = "Three"
+        singles[4] = "Four"
+        singles[5] = "Five"
+        singles[6] = "Six"
+        singles[7] = "Seven"
+        singles[8] = "Eight"
+        singles[9] = "Nine"
+
+        doubles = {}
+        doubles[0] = ""
+        doubles[2] = "Twenty"
+        doubles[3] = "Thirty"
+        doubles[4] = "Forty"
+        doubles[5] = "Fifty"
+        doubles[6] = "Sixty"
+        doubles[7] = "Seventy"
+        doubles[8] = "Eighty"
+        doubles[9] = "Ninety"
+
+        teens = {}
+        teens[0] = "Ten"
+        teens[1] = "Eleven"
+        teens[2] = "Twelve"
+        teens[3] = "Thirteen"
+        teens[4] = "Fourteen"
+        teens[5] = "Fifteen"
+        teens[6] = "Sixteen"
+        teens[7] = "Seventeen"
+        teens[8] = "Eighteen"
+        teens[9] = "Nineteen"
+
+        placevalue = {}
+        placevalue[2] = "Hundred,"
+        placevalue[3] = "Thousand,"
+        placevalue[5] = "Lakh,"
+        placevalue[7] = "Crore,"
+
+        temp_num = number
+        words = ""
+        counter = 0
+        digits = int(digits)
+        while counter < digits:
+            current = temp_num % 10
+            if counter % 2 == 0:
+                addition = ""
+                if counter in placevalue.keys() and current != 0:
+                    addition = placevalue[counter]
+                if counter == 2:
+                    words = singles[current] + addition + words
+                elif counter == 0:
+                    if ((temp_num % 100) // 10) == 1:
+                        words = teens[current] + addition + words
+                        temp_num = temp_num // 10
+                        counter += 1
+                    else:
+                        words = singles[current] + addition + words
+
+                else:
+                    words = doubles[current] + addition + words
+
+            else:
+                if counter == 1:
+                    if current == 1:
+                        words = teens[number % 10] + words
+                    else:
+                        addition = ""
+                        if counter in placevalue.keys():
+                            addition = placevalue[counter]
+                        words = doubles[current] + addition + words
+                else:
+                    addition = ""
+                    if counter in placevalue.keys():
+                        if current == 0 and ((temp_num % 100) // 10) == 0:
+                            addition = ""
+                        else:
+                            addition = placevalue[counter]
+                    if ((temp_num % 100) // 10) == 1:
+                        words = teens[current] + addition + words
+                        temp_num = temp_num // 10
+                        counter += 1
+                    else:
+                        words = singles[current] + addition + words
+            counter += 1
+            temp_num = temp_num // 10
+    return words
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()