foo.cc: In function 'int main()':
foo.cc:6:13: warning: format '%c' expects argument of type 'int', but argument 3 has type 'const char*' [-Wformat=]
    6 |  printf("%d%c%d%c",f1," ",f2," " );
      |            ~^         ~~~
      |             |         |
      |             int       const char*
      |            %s
foo.cc:6:17: warning: format '%c' expects argument of type 'int', but argument 5 has type 'const char*' [-Wformat=]
    6 |  printf("%d%c%d%c",f1," ",f2," " );
      |                ~^            ~~~
      |                 |            |
      |                 int          const char*
      |                %s

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