foo.c: In function 'FindiSecondMax':
foo.c:29:33: error: 'max' undeclared (first use in this function); did you mean 'max2'?
   29 |                                 max=a[i];i2=i;
      |                                 ^~~
      |                                 max2
foo.c:29:33: note: each undeclared identifier is reported only once for each function it appears in

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