C++统计不同类型字符出现次数

PHP小丑

#include <iostream>
#include <cstring>
using namespace std;
int main(){
char a[1001];
int b=0,s=0,n=0,o=0;
cin.getline(a,1001);
for(int i=0;i<strlen(a);i++){
if(a[i]>='a'&&a[i]<='z') s++;
else if(a[i]>='A'&&a[i]<='Z') b++;
else if(a[i]>='0'&&a[i]<='9') n++;
else o++;
}
cout<<b<<" "<<s<<" "<<n<<" "<<o<<endl;
return 0;
}