foo.c: In function 'main':
foo.c:5:25: warning: unknown conversion type character '.' in format [-Wformat=]
    5 |         scanf("%lf %lf %.2lf",&a,&m,&k);
      |                         ^
foo.c:5:15: warning: too many arguments for format [-Wformat-extra-args]
    5 |         scanf("%lf %lf %.2lf",&a,&m,&k);
      |               ^~~~~~~~~~~~~~~

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