Adding good multiplication function

CTPLICA/comproject.py

@@ -1,6 +1,7 @@
 #!/usr/bin/python3
 
 import sys
+from unittest import result
 import numpy
 import time
 
@@ -163,13 +164,83 @@ def greater_than(arg1_integer_part: str, arg2_integer_part: str, arg1_decimal_pa
 
 
 def sb_multiply(arg1: str, arg2: str) -> bool:
-    pass
+    # transform arg1 to string if not already in string and test if it's a full integer (without decimal part or decimal part equals zero)
+    arg1_as_string = str(arg1)
+    arg1_integer_part = arg1_as_string
+    arg1_decimal_part = ''
+    arg1_is_full_integer = True
+    arg1_is_negative = True if arg1_integer_part.startswith('-') else False
+    try:
+        arg1_integer_part, arg1_decimal_part = arg1_as_string.split(".")
+        if arg1_decimal_part==len(arg1_decimal_part)*'0': arg1_is_full_integer = True
+        else: arg1_is_full_integer = False
+    except:
+        pass#nothing to do
+    if arg1_is_negative: arg1_integer_part = arg1_integer_part.replace('-', '')
+    # transform arg2 to string if not already in string and test if it's a full integer (without decimal part or decimal part equals zero)
+    arg2_as_string = str(arg2)
+    arg2_integer_part = arg2_as_string
+    arg2_decimal_part = ''
+    arg2_is_full_integer = True
+    arg2_is_negative = True if arg2_integer_part.startswith('-') else False
+    try:
+        arg2_integer_part, arg2_decimal_part = arg2_as_string.split(".")
+        if arg2_decimal_part==len(arg2_decimal_part)*'0': arg2_is_full_integer = True
+        else: arg2_is_full_integer = False
+    except:
+        pass#nothing to do
+    if arg2_is_negative: arg2_integer_part = arg2_integer_part.replace('-', '')
+    # making integer and decimal parts same size
+    max_integer_part_size = max( len(arg1_integer_part), len(arg2_integer_part) )
+    arg1_integer_part = '0'*(max_integer_part_size-len(arg1_integer_part)) + arg1_integer_part
+    arg2_integer_part = '0'*(max_integer_part_size-len(arg2_integer_part)) + arg2_integer_part
+    #---------
+    max_decimal_part_size = max(len(arg1_decimal_part),len(arg2_decimal_part))
+    arg1_decimal_part = arg1_decimal_part + '0'*(max_decimal_part_size-len(arg1_decimal_part))
+    arg2_decimal_part = arg2_decimal_part + '0'*(max_decimal_part_size-len(arg2_decimal_part))
+    # making real multiplication operation
+    rem = '0'
+    intermediate_numbers = []
+    
+    #down_number_in_multiplication = arg2_integer_part+arg2_decimal_part
+    #up_number_in_multiplication = arg1_integer_part+arg1_decimal_part
+    if arg2_is_full_integer:
+        down_number_in_multiplication = arg2_integer_part
+    else:
+        down_number_in_multiplication = arg2_integer_part+arg2_decimal_part
+    if arg1_is_full_integer:
+        up_number_in_multiplication = arg1_integer_part
+    else:
+        up_number_in_multiplication = arg1_integer_part+arg1_decimal_part
+    
+    print("up_number_in_multiplication", up_number_in_multiplication)
+    print("down_number_in_multiplication", down_number_in_multiplication)
+    for j in range(len(down_number_in_multiplication)-1, -1, -1):
+        current_intermediate_number = '0'*( (len(down_number_in_multiplication)-1) - j )
+        for i in range(len(up_number_in_multiplication)-1, -1, -1):
+            res = int( eval( '((' + down_number_in_multiplication[j] + '*' + up_number_in_multiplication[i] + ')+' + str(rem) + ')%10' ) )
+            current_intermediate_number = str(res) + current_intermediate_number
+            rem = int( eval( '(((' + down_number_in_multiplication[j] + '*' + up_number_in_multiplication[i] + ')+' + str(rem) + ') - ' + str(res) + ')/10') )
+        if rem != '0': current_intermediate_number = str(rem) + current_intermediate_number
+        intermediate_numbers.append(current_intermediate_number)
+    result = intermediate_numbers[0]
+    for k in range(1, len(intermediate_numbers)):
+        result = sb_addition(result, intermediate_numbers[k])
+    print("result before putting . :", result)
+    if not(arg1_is_full_integer) or not(arg2_is_full_integer):
+        result = result[:-len(arg1_decimal_part+arg2_decimal_part)]+'.'+result[len(result)-len(arg1_decimal_part+arg2_decimal_part):] #here to modifiy
+    while result.startswith('0'): result = result[1:]
+    if (arg1_is_negative and not(arg2_is_negative)) or (not(arg1_is_negative) and arg2_is_negative): result = '-' + result
+    #print("result", result[:-len(arg1_decimal_part+arg2_decimal_part)]+'.'+result[len(result)-len(arg1_decimal_part+arg2_decimal_part):])
+    return result
 
 if __name__=='__main__':
-    print("add", sb_addition("-10", "-1.99999993") )
+    #print("add", sb_addition("2222222222222222222222222222222222222222.55", "2.55") )
+    #print("add", sb_addition("3.8257", "0.8257") )
     #print( type(sb_substract("9999999.019999", "99999.99999993")) )
-    print("sub", sb_substract("12", "78.9999") )
+    #print("sub", sb_substract("12", "78.9999") )
     #print(greater_than("0","1110", "0","1112", True, True))
     #print(greater_than("0","0", "1110","1112"))
     #print(greater_than('9001','9003'))
+    print("mul", sb_multiply('123','123.0'))
     pass