提示并输入一个字符串，统计该字符串中字母个数、数字个数、空格个数、其他字符的个数

#include <iostream>using namespace std;int main()
{cout<<"请输入字符串:";string str;getline(cin,str);int num=0;int alp=0;int spa=0;int other=0;int len=str.length();for(int i=0;i<len;i++){if(str[i]>='0'&&str[i]<='9'){num++;}else if((str[i]>='a' && str[i]<='z')||(str[i]>='A' && str[i]<='Z')){alp++;}else if(str[i]==' '){spa++;}else{other++;}}cout<<"数字"<<num<<"个"<<endl;cout<<"字母"<<alp<<"个"<<endl;cout<<"空格"<<spa<<"个"<<endl;cout<<"其他字符"<<other<<"个"<<endl;return 0;
}