Multiplication *something* style

#include "iostream"
int main(int argc, char const *argv[]){
  int total=0;

  std::string str1, str2;
  std::cin >> str1 >> str2;
  for (int i = 0; i < str1.length(); ++i)
    for (int j = 0; j < str2.length(); ++j){
      // cout << str1[i] << " " << str2[j] << " " << (str1[i]-48)*(str2[j]-48) << "\n";
      total += (str1[i]-48)*(str2[j]-48);
    }

  std::cout << total << "\n";
  return 0;
}