这样:#includevoidmain(){doublea,b,c,he;printf("请输入三个实数n");scanf("%lf",&a);scanf("%lf",&b);scanf("%lf",&c);he=a+b+c;printf("这个三个数是:%lf%lf%lfn",a,b,c);printf("这个三个数的和是:%lfn",he);a=(int)(a+0.5);b=(int)(b+0.5);c=(int)(c+0.5);printf("四舍五入保留整数的结果是:%lf%lf%lfn",a,b,c);}
求采纳