预备知识:
palindromic number 回文数字。如:9009.正序与逆序所获取的字符串是一致的。
Question:
A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 99.
Find the largest palindrome made from the product of two 3-digit numbers.
在python中如何进行:
1.数值转化成字符串。
函数 描述
int(x [,base ]) 将x转换为一个整数
long(x [,base ]) 将x转换为一个长整数
float(x ) 将x转换到一个浮点数
complex(real [,imag ]) 创建一个复数
str(x ) 将对象 x 转换为字符串
repr(x ) 将对象 x 转换为表达式字符串
eval(str ) 用来计算在字符串中的有效Python表达式,并返回一个对象
tuple(s ) 将序列 s 转换为一个元组
list(s ) 将序列 s 转换为一个列表
chr(x ) 将一个整数转换为一个字符
unichr(x ) 将一个整数转换为Unicode字符
ord(x ) 将一个字符转换为它的整数值
hex(x ) 将一个整数转换为一个十六进制字符串
oct(x ) 将一个整数转换为一个八进制字符串
2.如何对字符串进行 reverse。
‘abc'[::-1] 返回cba
my solution:
def findBpalindromic():
""" find the biggest palindromic number which is product of two 3-digit number
"""
[x,y,result,rst,rstx,rsty] = [1000,1000,0,0,0,0]
for i in range(100,x):
for j in range(100,y):
result = i * j
rvs = str(result)[::-1]
if rvs == str(result):
if rst < result :
rst = rst1
rstx = i
rsty = j
print rst,rstx,rsty
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