foo.c: In function 'main':
foo.c:6:6: error: expected identifier or '(' before numeric constant
  int 2,5,3,d;
      ^
foo.c:7:19: error: lvalue required as unary '&' operand
  scanf("%d,%d,%d",&2,&5,&3);
                   ^
foo.c:7:22: error: lvalue required as unary '&' operand
  scanf("%d,%d,%d",&2,&5,&3);
                      ^
foo.c:7:25: error: lvalue required as unary '&' operand
  scanf("%d,%d,%d",&2,&5,&3);
                         ^
foo.c:8:2: error: 'd' undeclared (first use in this function)
  d=max(2,5,3);
  ^
foo.c:8:2: note: each undeclared identifier is reported only once for each function it appears in

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