哪错了？谁知道吗？详细解释一下吧

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scanf中，输入变量前要加&取地址才行

1、int mian() 要有类型
2、接收输入取地址 &

scanf("%d%s%d%d", &groups[i].num, groups[i].name, &groups[i].score[0], &groups[i].score[1]);