C++统计数字字符个数

Shun

#include <iostream>
using namespace std;
int main(){
char a[256];
int n,m;
cin>>n;
for (int i=0;i<n;i++){
cin>>a[i];
}
for (int i=0;i<n;i++){
if(a[i]>='0'&&a[i]<='9'){
m++;
}
}
cout<<m<<endl;
return 0;
}