c语言程序题:从键盘上任输入三个实数,求出最大数和最小数的和值,答:{ float a,b,c,max,min,sum,average;printf("请输入三个实数,以空格隔开");scanf("%f %f %f",&a,&b,&c);max=a;min=a;if(b>max) max=b;if(b<min) min=b;if(c>max) max=c;if(c<min) min=c;sum=min+max;average=sum/2;printf("和值为%f\n",sum);printf("平均值为%f...