求教一下函数问题

#include <stdio.h>
#include <malloc.h>



struct student
{
char name[100];
float score;
};

int main(void)
{
int len;
int i, j;
struct student * parr;
struct student t;


printf("请输入学生人数 len = ");
scanf("%d", &len);
printf("\n");

parr = (struct student *)malloc(len * sizeof(struct student));

for (i=0; i<len; ++i)
{
printf("请输入第%d个学生信息\n", i+1);

printf("name = ");
scanf("%s", parr[i].name);

printf("score = ");
scanf("%f", &parr[i].score);
printf("\n\n");
}


for (i=0; i<len; ++i)
for (j=0; j<len-1-i; ++j)
{
if (parr[j].score > parr[j+1].score)
{
t = parr[j];
parr[j] = parr[j+1];
parr[j+1] = t;
}
}


return 0;
}





这段要写成函数应该发送哪两个参数，最好能写详细点给我参考下
for (i=0; i<len; ++i)
for (j=0; j<len-1-i; ++j)
{
if (parr[j].score > parr[j+1].score)
{
t = parr[j];
parr[j] = parr[j+1];
parr[j+1] = t;
}
}