参考程序：

       #include<stdio.h>

        main()

       {  int i,j,n,m;

          float fc,max=0,av,sum=0;

          scanf("%d,%d",&n,&m);

          for(i=1;i<=n;i++)

             for(j=1;j<=m;j++)

             { scanf("%f",&fc);

               sum+=fc;

               if(max<fc)max=fc;

              }

            av=sum/(nm);

            printf("%f,%f",max,av);

         {