foo.cc: In function 'int main()':
foo.cc:8:23: warning: '0' flag used with '%n' gnu_printf format [-Wformat=]
     printf("%0.nf",a/b);
                       ^
foo.cc:8:23: warning: precision used with '%n' gnu_printf format [-Wformat=]
foo.cc:8:23: warning: format '%n' expects argument of type 'int*', but argument 2 has type 'double' [-Wformat=]

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