#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>

struct student{
    long ID;
    char name[20];
    float score;
}stu[15];
struct student *p;


//函数原型声明
void get(struct student *p,int N,int i);
void print(struct student *p,int N,int i);
void search_name(int N);
void sort_ID(struct student *p,int N);
void sort_score(struct student *p,int N);
void sort_name(struct student *p,int N);

//主函数
void main(){
    int N,i=0;
    printf("Please enter the number of students(5~15):");
    scanf("%d",&N);
    printf("\n");
    //子函数
    get(p,N,i);//输入
    p=stu;
    print(p,N,i);
    p=stu;
    search_name(N);//按姓名查询
    sort_ID(p,N);//按学号排序
    print(p,N,i);
    p=stu;
    sort_score(p,N);//按成绩排序
    print(p,N,i);
    p=stu;
    sort_name(p,N);//按姓名排序
    print(p,N,i);
    p=stu;
    getch();
}

void get(struct student *p,int N,int i){
    p=stu;
    for(i;i<N;i++){
        printf("NO.%d:Please enter the student's ID:\t",i+1);
        scanf("%ld",&((p+i)->ID));
        fflush(stdin);
        printf("     Please enter the student's name:\t");
        scanf("%s",&((p+i)->name));
        fflush(stdin);
        printf("     Please enter the student's score:\t");
        scanf("%f",&((p+i)->score));
        fflush(stdin);
    }
}

void print(struct student *p,int N,int i){
        printf("               The Score List\n");
        printf("NO.    ID         Name        Score\n");
        for(i;i<N;i++){
            printf("%-6d%-12d%-20s%-6f\n",i+1,(p+i)->ID,(p+i)->name,(p+i)->score);
        }
}

void search_name(int N){
    int i,count=0;
    char name[20];
    printf("Please enter the name you want to find:");
    scanf("%s",name);
    printf("\n");
    for (i=0;i<N;i++){
        if (strcmp(name,(p+i)->name) == 0){
            printf("ID         Name        Score\n");
            printf("%-6d%-12d%-6f\n",i+1,(p+i)->ID,(p+i)->score);
            count++;
        }
    }
    if(count==0)
        printf("This guy is not exsist!\r\n");
}

void sort_ID(struct student *p,int N){
    struct student *pt;
    int i,j;
    for(i=0;i<N;i++){
        for(j=0;j<N-i;j++){
            if((p+j)->ID>(p+j+1)->ID){
                *pt=*(p+j);
                *(p+j)=*(p+j+1);
                *(p+j+1)=*pt;
            }
        }
    }
}

void sort_score(struct student *p,int N){
    struct student *pt;
    int i,j;
    for(i=0;i<N;i++){
        for(j=0;j<N-i;j++){
            if((p+j)->score>(p+j+1)->score){
                *pt=*(p+j);
                *(p+j)=*(p+j+1);
                *(p+j+1)=*pt;
            }
        }
    }
}

void sort_name(struct student *p,int N){
    struct student *pt;
    int i,j;
    for(i=0;i<N;i++){
        for(j=0;j<N-i;j++){
            if(strcmp((p+j)->name,(p+j+1)->name)>0){
                *pt=*(p+j);
                *(p+j)=*(p+j+1);
                *(p+j+1)=*pt;
            }
        }
    }
}
经过了断点测试，问题就是出在这三个函数中
void sort_ID(struct student *p,int N);
void sort_score(struct student *p,int N);
void sort_name(struct student *p,int N);
可是不会改啊……