功能：计算平均成绩并统计90分以上人数。#include main(){int n,m;float grade,average;average=0.0;/***********SPACE***********/n=m=【1】;while(1){【?】("%f",&grade);if(grade<0) break;n++;average+=grade;if(grade<90)【3】;m++;}if(n) printf("%.2f%d\n",average/n,m);}