Case convert

#include<iostream>
using namespace std;


class Solution {
public:
    /**
     * @param character: a character
     * @return: a character
     */
    char lowercaseToUppercase(char character) {
        // write your code here
        int a;
        char b;
        a=int(character);
        b=char(a-32);
        return b;
    }
};
int main()
{
    char b;
    Solution s;
    b=s.lowercaseToUppercase(‘a‘);
    cout << b << endl;
    return 0;
}

注：LintCode的题目