/in/foo.c:3:1: error: unknown type name 'class'
 class seqList()
 ^~~~~
/in/foo.c: In function 'main':
/in/foo.c:46:8: warning: implicit declaration of function 'FindiSecondMax' [-Wimplicit-function-declaration]
 int t1=FindiSecondMax( a ,  n1) ;
        ^~~~~~~~~~~~~~
/in/foo.c: In function 'seqList':
/in/foo.c:25:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
At top level:
/in/foo.c:5:6: warning: 'FindiSecondMax' defined but not used [-Wunused-function]
  int FindiSecondMax(int  *arr , int n)
      ^~~~~~~~~~~~~~