/in/foo.c: In function 'main':
/in/foo.c:6:1: warning: statement with no effect [-Wunused-value]
 for(a;a<=b;a++)
 ^~~
/in/foo.c:6:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
/in/foo.c:8:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  printf("%d",j);
  ^~~~~~