不知道为啥用string会有问题

include iostream

include cstring

using namespace std;

int main(){

int t;
char a[80];
int score;
int count;
cin>>t;
for(int i=0;i<t;i++){
    cin>>a;
    count=0;
    score=0;
    for(int j=0;j<int(strlen(a));j++){
        if(a[j]=='O')count++;
        else if(a[j]=='X')count=0;
        else if(a[j]=='\0')break;
        score+=count;
    }
    cout<<score<<endl;
}

return 0;

}