/in/foo.c: In function 'main':
/in/foo.c:6:16: warning: right-hand operand of comma expression has no effect [-Wunused-value]
    6 |         for(i=1,i<=n,i++)
      |                ^
/in/foo.c:6:25: error: expected ';' before ')' token
    6 |         for(i=1,i<=n,i++)
      |                         ^
      |                         ;
/in/foo.c:6:25: error: expected expression before ')' token