那错了？

#include<bits/stdc++.h>
using namespace std;
int main(){
int a,b,sum = 0
cin >> a >> b;
for(int i = a;i <= b;i++){
int k = i;
while(t > 0){
sum += t % 10;
t /= 10;
}
}
cout << sum << endl;

return 0; 

}