排序功能实现不了，功力不深，可不可以帮忙指点一下？

Question

#include <stdio.h>#include<string.h>typedef struct student{    long studentID;    char studentname[10]; char studentsex; int studentage;    int score[6];    int studentsum;}STUDENT;int main(void){ void InputScore(STUDENT stu[],int n,int m);    void TallSort(STUDENT stu[],int n,int m);    void NumberSearch(STUDENT stu[],int n,int m);    void PrintScore(STUDENT stu[],int n,int m);    STUDENT stu[30];    int n,m,x;    int coursesum[30];    printf("How many student?\n");    scanf("%d",&n);    printf("How many subject?\n");    scanf("%d",&m);    do{    printf("1.录入学生信息\n");    printf("2.按科目总分排名\n");    printf("3.按学号查询学生信息\n");    printf("4.学生信息修改\n"); printf("5.学生信息删除\n");    printf("6.List record\n");    printf("0.Exit\nPlease enter your choice:");    scanf("%d",&x); getchar();    switch(x)    {    case 0:        return 0;    case 1:       InputScore(stu,n,m);        break;    case 2:       TallSort(stu,n,m);        break;    case 3:        NumberSearch(stu,n,m);        break;    case 6:        PrintScore(stu,n,m);    }    }while(1);}/*------------录入学生信息子程序------------*/void InputScore(STUDENT stu[],int n,int m){    int i,j;    for (i = 0;i < n;i++)    {        stu[i].studentsum = 0;        printf("录入学生信息 %d:\n",i+1);        scanf("%ld",&stu[i].studentID);        getchar();        scanf("%s",&stu[i].studentname); scanf("%s",&stu[i].studentsex); scanf("%s",&stu[i].studentage);        for(j = 0;j < m;j++)        {            scanf("%d",&stu[i].score[j]);            stu[i].studentsum = stu[i].studentsum + stu[i].score[j];        }    }}void StudentScore(STUDENT stu[],float studentaver[],int n, int m){    int i,j;    for(i = 0;i < n;i++)    {        stu[i].studentsum ;        printf("%s's sum is %d\n",stu[i].studentname,stu[i].studentsum);    }}/*------------按科目总分排序子程序------------*/void TallSort(STUDENT stu[],int n,int m){    int i,j;    STUDENT temp;    for(i = 0;i < n-1;i++) {   for(j = i+1;j < n;j++)        {            if(stu[i].studentsum < stu[j].studentsum)            {                temp = stu[j];                stu[j] = stu[i];                stu[i] = temp;            }        }    }    for(i = 0;i < n;i++)    {        printf("%4d%4d%8s%8s%4d%4d\n",i+1, stu[i].studentID,stu[i].studentname,stu[i].studentsex,stu[i].studentage,stu[i].studentsum);    }}/*------------按学号查询子程序------------*/void NumberSearch(STUDENT stu[],int n,int m){    int pos;    long a;    printf("Input the searching ID:");    scanf("%ld",&a);    pos = Search1(stu,a,n,m);    if(pos != -1){        //return 0;     }else{        printf("no found\n");    }}int Search1(STUDENT stu[],long a,int n,int m){    int i,j;    STUDENT temp;    for(i = 0;i < n-1;i++)    {    for(j = i+1;j < n;j++)    {        if(stu[i].studentsum < stu[j].studentsum)        {            temp = stu[j];            stu[j] = stu[i];            stu[i] = temp;        }    }    }    for(i = 0;i < n;i++)    {        if(stu[i].studentID == a){            printf("name = %d,ID = %d,sex = %s,age = %d,score = %d,rank = %d\n",stu[i].studentID,stu[i].studentname,stu[i].studentsex,stu[i].studentage,stu[i].studentsum,i+1);            return 1;        }}    return -1;}/*------------打印成绩子程序------------*/void PrintScore(STUDENT stu[],int n,int m){    int i,j;    for(i = 0;i < n;i++)    {        printf("%10d%8s",stu[i].studentID,stu[i].studentname);        for(j = 0;j < m;j++)        {            printf("%4d",stu[i].score[j]);        }         printf("  sum is %d\n",stu[i].studentsum);    }}

Answer 1

在线等，急！！！