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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. int main() {
  6. int x = 1;
  7. cout << setfill('0') << setw(4) << x << endl;
  8. return 0;
  9. }
Success #stdin #stdout 0s 3340KB
stdin
Standard input is empty
stdout
0001