這些英文是什么意思？麻煩了
?hello.c: In function 'main': hello.c:14:9: error: 'num' undeclared (first use in this function) ? ? ? ? num += i*flag; ? ? ? ? ^~~ hello.c:14:9: note: each undeclared identifier is reported only once for each function it appears in
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2017-12-08
沒定義num