用FOR语句
#include <stdio.h>
main ()
{int m,n,i,j;
float v,s,x;
printf("press the number of students and the number of the courses\n");
scanf("%d,%d",&m,&n);
i=1;
for(;i<=m;i=i+1)

{printf("%d",i);
    for(s=0,j=1;j<=n;j++ )
{
    scanf("%f",&x);
s=s+x;
}
v=s/n;
printf("%f\n",v);
}
}

用WHILE语句
#include <stdio.h>
main ()
{int m,n,i,j;
float v,s,x;
printf("press the number of students and the number of the courses\n");
scanf("%d,%d",&m,&n);
i=1;
while (i<=m)
{
printf("the %d student\n",i);
s=0;
j=1;
while (j<=n)
{
printf("press the %d course's score=\n",j);
scanf("%f",&x);
s=s+x;
j=j+1;
}
v=s/n;
printf("%f\n",v);
i=i+1;
}
}

用FOR语句怎么使和用WHILE语句一样在应用程序中出现提示语句如（请输入第K名成绩）

#include <stdio.h>
int main ()
{
    int m,n,i,j;
    float v,s,x;
    printf("press the number of students and the number of the courses\n");
    scanf("%d,%d",&m,&n);
    i=1;
    for(;i<=m;i=i+1)   
    {
        printf("the %d student\n",i);
        for(s=0,j=1;j<=n;j++ )
        {
            printf("press the %d course's score=\n",j);
            scanf("%f",&x);
            s=s+x;
        }
        v=s/n;
        printf("%f\n",v);
    }
    return 0;
}