在編程和日常電腦應用中，有時我們需要將十進制數轉換為二進制，八進制或十六進制。 在此示例中，我們將為此編寫三個數字系統間數值轉換的函數:
dec_to_bin() - 將十進制數轉換為二進制， dec_to_oct() - 將十進制數轉換為八進制， dec_to_hex() - 將十進制數轉換為十六進制。
# Functions dec_to_bin, dec_to_oct, and dec_to_hex
def dec_to_bin(i):
if (i == 0):
b = "0"
else:
b = ""
while (i != 0):
r = i % 2
b = str(r)+b
i = i // 2
return b
def dec_to_oct(i):
if (i == 0):
o = "0"
else:
o = ""
while (i != 0):
r = i % 8
o = str(r)+o
i = i // 8
return o
def dec_to_hex(i):
xdigit = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
"A", "B", "C", "D", "E", "F"]
if (i == 0):
x = "0"
else:
x = ""
while (i != 0):
r = i % 16
x = xdigit[r]+x
i = i // 16
return x
i = int(input("Enter an unsigned integer: "))
print("Binary representation of decimal integer %d is %s."
% (i,dec_to_bin(i)))
print("Octal representation of decimal integer %d is %s."
% (i,dec_to_oct(i)))
print("Hexadecimal representation of decimal integer %d is %s."
% (i,dec_to_hex(i)))
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在此示例中，我們輸入十進制數 123，結果如下
Enter an unsigned integer: 123
Binary representation of decimal integer 123 is 1111011.
Octal representation of decimal integer 123 is 173.
Hexadecimal representation of decimal integer 123 is 7B.
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