...输入n个学生的成绩,计算平均分,并统计各等级成绩的个数。答:include <stdio.h> int main(int argc, char *argv[]){ int count,i,sum=0,avg;int score[20];int count_A=0,count_B=0,count_C=0,count_D=0,count_E=0;printf("你要输入几个学生的成绩:");scanf("%d",&count);printf("请输入%d个学生的成绩\n",count);for(i=0;i<count;...