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Related to question Excel Sheet Column Title
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28
相当于26进制的运算：
int titleToNumber(char *s) { int i,res=0; for(i = 0; i<strlen(s); i++){ res = res*26+s[i]-‘A‘+1; } return res; }
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原文地址：http://www.cnblogs.com/zhhc/p/4345206.html
