算法

/*  1.字符串最后一个单词的长度*/
    string str;
    getline(cin, str);
    int count = 0;
    int len = str.length();
    for (int i = len-1; i > -1; i--)
    {
        if (str[i] != ' ')
        {
            count++;
        }
        else
        {
            break;
        }
    }
    cout << count;



    /*
     2.计算某字符出现次数
    */
    string str_data;
    char ch;
    cout << "晴天输入一行由字母，数字和空格组成的字符串:";
    cin >> str_data;
    cout << "输入一个字符:";
    cin >> ch;
    int count = 0;
    for (auto i = 0; i < str_data.size(); i++)
    {
        if (toupper(ch) == toupper(str_data[i]))
        {
            count++;
        }
    }
    cout << count;