foo.c: In function 'main':
foo.c:7:3: error: assignment to expression with array type
  b=a;
   ^
foo.c:6:19: warning: variable 'b' set but not used [-Wunused-but-set-variable]
  char a[]="hello",b[10];
                   ^
foo.c:5:9: warning: unused variable 'i' [-Wunused-variable]
     int i;
         ^

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