用C语言编写 (给出一百分的成绩，要求输出成绩等级， 90分以上为A,80-89为B,70-79

#include int main(){ int sc; scanf ("%d", &sc); if (sc > 90)printf ("A\n"); else if (sc >= 80)printf ("B\n"); else if (sc >= 70)printf ("C\n"); else if (sc >= 60)printf (&qu