commit cb9bab62533005a3bb8d6bf2ece54caf062c1ef7
Author: Dm1tr1y147 <me@dmitriy.icu>
Date:   Tue Apr 7 22:10:04 2020 +0500

    Лабораторная работа - Системы счисления

diff --git a/1.py b/1.py
new file mode 100644
index 0000000..2ce70cb
--- /dev/null
+++ b/1.py
@@ -0,0 +1,77 @@
+dictionary = [chr(i) for i in range(ord('0'), ord('9')+1)] + \
+    [chr(i) for i in range(ord('A'), ord('F')+1)]
+
+
+def validation(string, ibase, tbase):
+    for n in string:
+        if not n in dictionary[:ibase] + [',', '.']:
+            return False
+    if ibase < 2 or ibase > 16 or tbase < 2 or tbase > 16:
+        return False
+    return True
+
+
+def convert(string, ibase, tbase):
+    if string == '0':
+        return 0
+    if ibase != 10:
+        string = other_to_dec(string, ibase)
+    if tbase == 10:
+        return string
+    string = float(string)
+    integer = dec_to_other(int(string), tbase)
+    decimal = string - int(string)
+    if decimal:
+        decimal = float_dec_with__to_other(decimal, tbase)
+        return integer + ',' + decimal
+    return integer
+
+
+def other_to_dec(string, ibase):
+    sum = 0
+    amount = len(string.split('.')[0])-1
+    for n in string:
+        if n != '.':
+            sum += int(dictionary.index(n)) * ibase**amount
+            amount -= 1
+    return sum
+
+
+def dec_to_other(num, tbase):
+    result = ''
+    while num // tbase > 0:
+        result += str(dictionary[int(num % tbase)])
+        num //= tbase
+    result += str(dictionary[int(num % tbase)])
+    return result[::-1]
+
+
+def float_dec_with__to_other(num, tbase):
+    result = ''
+    counter = 0
+    while num - int(num) > 0 and counter < 8:
+        result += str(dictionary[int(num * tbase)])
+        num = num * tbase - int(num * tbase)
+        counter += 1
+    return result[:7]
+
+# _____ MAIN PROGRAMM _____
+
+input_number = input("Число: ").upper().replace(",", ".")
+init_base = int(input("Основание исходной системы: "))
+target_base = int(input("Основание конечной системы: "))
+
+hasSign = False
+if input_number[0] == '-':
+    hasSign = True
+    input_number = input_number[1:]
+
+if not validation(input_number, init_base, target_base):
+    print("Wrong input!")
+    exit()
+
+output = convert(input_number, init_base, target_base)
+
+if hasSign:
+    output = '-' + str(output)
+print(output)