输入一个正整数n,再输入n个学生的成绩,计算平均分,并统计不及格成绩的个数。 #include int main(void) { int count, i, n; double grade, total; printf("Enter n; ") ; scanf("%d",&n); total = 0; count=0; for(i=1;i<=n;i++) { printf("Enter grade#%d:",i); scanf("%lf",&grade); total=total+grade; if(________ ) count++; } printf( "Grade average=%.2f\n", total/n); printf( "Number of failures=%d\n", count); return 0; }