foo.c: In function 'main':
foo.c:15:12: error: expected expression before ')' token
  if(a+b>=c,){
            ^
foo.c:15:11: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  if(a+b>=c,){
           ^
foo.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&a,&b,&c);
  ^~~~~~~~~~~~~~~~~~~~~~~~

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