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

/*define the number of the student as 10*/
#define num 10

/*struct Student definition*/
struct Student
{
       char number[5];
       int score;
}stuscore[num];
/*definition end*/

/*function declared*/
void SortStudentScore(struct Student stu[num]);
void ReadStudentScore(char *fileName,struct Student stu[num]);
void WriteStudentScore(char *fileName,struct Student stu[num]);
/*declare end*/

int main(void)
{
       char * sourcefile="S1_Score.txt";
       char * targetfile="1_OrderScore.txt";       
       ReadStudentScore(sourcefile,stuscore);
       SortStudentScore(stuscore);
       WriteStudentScore(targetfile,stuscore);
       return 0;
}

void ReadStudentScore(char *fileName,struct Student stu[num])
{
       FILE * fp;
       int i=0;
       struct Student * getchara=stu;
       if((fp=fopen(fileName,"r"))==NULL)
       {
              printf("Error!can't open the source file %s\n!",fileName);
              getch();
              exit(1);
       }
       for(i=0;i<num;i++)
       {
              fscanf(fp,"%5s",getchara->number);
              fgetc(fp);
              fscanf(fp,"%d\n",&getchara->score);
              getchara++;
       }
       fclose(fp);
}

/*the followed SortStudentScore is used to sorts the student.*/
/*SortStudentScore is completed by the 'maopao' method*/
void SortStudentScore(struct Student stu[num])
{
       int i,j,flag;
       struct Student temp;
       for(i=0;i<num-1;i++)
       {
              flag=0;
              for(j=num-1;j>i;j--)
                     if(stu[j].score>stu[j-1].score)
                     {
                            temp=stu[j];
                            stu[j]=stu[j-1];
                            stu[j-1]=temp;
                            flag=1;
                     }
                     if(flag==0)
                            break;
       }
}
/*SortStudentScore function end*/

void WriteStudentScore(char *fileName,struct Student stu[num])
{
       int i;
       FILE *fp=fopen(fileName,"r");
       for(i=0;i<num;i++)
       {
              fscanf(fp,"%s%d",stu[i].number,&stu[i].score);
       }
       fclose(fp);
}