计数字符串中的字母将返回不正确的数字

老师要我们写一个程序，计算输入字符串中的字母(a-z, a-z)、数字和特殊字符的数量。我们只允许使用<iostream>。

我的程序正确地计数字母，但是我不能得到数字或其他字符的正确计数。下面是我的代码:

#include <iostream>   //preprocessor directive
using namespace std;
//preprocessor directives

int main ()
{
//declare and initialize variables
    char s[50];
    int i;
    int letter = 0;
    int number = 0;
    int other = 0;

//user input
    cout << "Enter a continuous string of characters with no blank spaces" << endl;
    cout << "(example: aBc1234!@#$%)" << endl << endl;
    cout << "Enter your string: ";
    cin >> s;
    cout <<endl;
//loop through the string
//count letters
    i = 0;
    while (s[i] !=0)
    {
    if ((s[i] >= 'a' && s[i] < 'z') ||
        (s[i] >= 'A' && s[i] < 'Z'))
        letter++;
    i++;
    }
//count numbers
    {
    if ((s[i] >= '0' && s[i] < '9'))
        number++;
    i++;
    }
//count other
    {
    if ((s[i] >= '!' && s[i] < ')'))
        other++;
    i++;
    }
//output results
    cout << "Your string has " << letter << " letters" << endl;
    cout << number << " numbers, and " << endl;
    cout << other << " other characters" << endl;

    return 0;
}