这个字符串的程序哪里不正确 求指正 谢谢！

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题目:输入十个字符，统计其中大写字母，小写字母，数字字符，空格和其他字符的个数。

样例输入
abc123## A 
样例输出
1 3 3 1 2 

=====================================================
#include <iostream>
#include <string>
using namespace std;
int main()
{
    string a;
    int i;
    int num1=0,num2=0,num3=0,num4=0,num5=0;
    cin>>a;
    for(i=0;i<=9;i++)
    {
        if(a[i]>=‘A‘&&a[i]<=‘Z‘)
        {
            num1++;
        }
        else
        {
            if(a[i]>=‘a‘&&a[i]<=‘z‘)
            {
                num2++;
            }
            else
            {
                if(a[i]>=‘0‘&&a[i]<=‘9‘)
                {
                    num3++;
                }
                else
                {
                    if(a[i]==‘ ‘)
                    {
                        num4++;
                    }
                    else
                    {
                        num5++;
                    }
                }
            }
        }
    }
    cout<<num1<<‘ ‘<<num2<<‘ ‘<<num3<<‘ ‘<<num4<<‘ ‘<<num5<<endl;
    return 0;
}

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这个字符串的程序哪里不正确 求指正 谢谢！

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原文地址：http://www.cnblogs.com/gsdfg54564/p/4390404.html