# 171. Excel Sheet Column Number

[Link](https://leetcode.com/problems/excel-sheet-column-number/)

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 
    ...
```

**Example 1:**

```
Input: "A"
Output: 1
```

**Example 2:**

```
Input: "AB"
Output: 28
```

**Example 3:**

```
Input: "ZY"
Output: 701
```

**Solution**

```
    public static String convertToTitle(int n) {
        int modresult = 0;
        StringBuilder sb = new StringBuilder();
        while(n != 0){
            n--;
            modresult = n%26;
            sb.append((char)(modresult + 'A'));
            n = n/26;
        }
        sb.reverse();
        return sb.toString();
    }
```
