/in/foo.c: In function 'main':
/in/foo.c:5:10: warning: right-hand operand of comma expression has no effect [-Wunused-value]
    5 | for(i=100,i<1000,i++)
      |          ^
/in/foo.c:5:21: error: expected ';' before ')' token
    5 | for(i=100,i<1000,i++)
      |                     ^
      |                     ;
/in/foo.c:5:21: error: expected expression before ')' token