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  1. #include <iostream>
  2. #include <stdio.h>
  3. using namespace std;
  4.  
  5. int main() {
  6. double num = 123.0;
  7. printf("xx%f", num);
  8. printf("\n");
  9. printf("xx%4.2f", num);
  10. printf("\n");
  11. printf("xx%10.2f", num);
  12. return 0;
  13. }
Success #stdin #stdout 0s 4444KB
stdin
Standard input is empty
stdout
xx123.000000
xx123.00
xx    123.00