foo.c: In function 'main':
foo.c:5:9: warning: right-hand operand of comma expression has no effect [-Wunused-value]
    5 |  for(m=1,n;m<n;m++)
      |         ^
foo.c:6:17: error: lvalue required as left operand of assignment
    6 |  {n%m==0?s=s+m:s=s
      |                 ^
foo.c:6:19: error: expected ';' before '}' token
    6 |  {n%m==0?s=s+m:s=s
      |                   ^
      |                   ;
......
    9 |  }
      |  ~                 

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