sort.c

学生管理系统c

#include <stdio.h>
#include "h.h"
/*按ave排序输出*/
void sort()
{
	char c;
	if((fp=fopen("student.dat","rb"))==0)
	{
		printf("cannot open!");
		exit(0);
	}
	for(i=0;fread(&st[i],LEN,1,fp)!=0;i++);
	fclose(fp);
	n=i;
	for(i=0;i<n;i++)
		for(j=i+1;j<n;j++)
			if(st[i].ave<st[j].ave)/*所要条件*/
			{
				s=st[i];
				st[i]=st[j];
				st[j]=s;
			}
	fp=fopen("student.dat","wb");
	printf("\nnumber    name             sex      score                                  ave ");
	for(i=0;i<n;i++)/*输出语句*/
	{
		printf("\n%-10s%-10s%10s",st[i].num,st[i].name,st[i].sex);
	    for(j=0;j<K;j++)
		   printf("%8d",st[i].score[j]);
		printf("%8.2f",st[i].ave);
		fwrite(&st[i],LEN,1,fp);                
	}
	fclose(fp);
	printf("\n");
	printf("\n\tDo you want enter the menu?(y/n)\n\ty--return menu\n\tn--exit:");
	getchar();
	scanf("%c",&c);
	if(c=='y'||c=='Y')
		main();
	if(c=='n'||c=='N')
		exit(0);
	getch();
}