#include<stdio.h>
#include<string.h>
struct
  {
    int num;//数据编号
    int shouru;//收入
    int zhichu;//支出
    int yue;//余额
  }date[366];
int sum=0;
void win();//菜单显示

void Login()
{
  int i;
  FILE *user;
  char name[10],pass[20],na[10],pa[20];
  printf("********          请输入你的选择:          ********\n");
  printf("********    1.登陆    2.注册    3.关闭    ********\n");
  scanf("%d",&i);
  switch (i)
    {
    case 1:
      {
      printf("请输入你的用户名:");
      scanf("%s",na);
      printf("请输入你的密码:");
      scanf("%s",pa);
      user=fopen("user.txt","r");
Goto1:fscanf(user,"%s %s\n",name,pass);
      if ((!strcmp(name,na)) && (!strcmp(pass,pa)))//判断用户名和密码
    { printf("********        欢迎你   %s        ********\n",name);
      fclose(user);
      win();
      break;
    }
      else if (fopen("user.txt","r")!=NULL)
     goto Goto1;//继续查找user.txt里的用户名和密码
      else
    {
     printf("********             密码错误             ********\n");
     fclose(user);
     Login();
     break;
    }
      }
    case 2:
      {
       user=fopen("user.txt","a");
       printf("请输入你的新用户名:");
       scanf("%s",name);
       printf("请输入你的新密码:");
       scanf("%s",pass);
       fprintf(user,"%s %s",name,pass);
       fprintf(user,"\n");
       fclose(user);
       Login();
       break;
      }
    case 3: break;
    }
}

void Input()
{
  FILE *dat;
  int m,n;
  dat=fopen("date.txt","a");
  printf("你要输入几个数据?");
  scanf("%d",&m);
  sum=sum+m;
  printf("收入 | 支出\n");
  for (n=1;n<=m;n++)
    {
     scanf("%d%d",&date[n].shouru,&date[n].zhichu);
     fprintf(dat,"%d %d\n",date[n].shouru,date[n].zhichu);
    }
  fclose(dat);
  printf("********      你输入了 %d 个数据      ********\n",m);
  win();
}

void all()
{
  FILE *dat;
  int i,x=0,y=0,z=0;
  dat=fopen("date.txt","r");
  for (i=1;i<=sum;i++)
  {
    fscanf(dat,"%d %d",&date[i].shouru,&date[i].zhichu);
    date[i].num=i;
    x=x+date[i].shouru;
    y=y+date[i].zhichu;
    z=x-y;
    date[i].yue=z;
  }
}

void Pr()
{
  int i;
  all();
  printf("|  编号  | 收入 | 支出 |  余额  |\n");
  for (i=1;i<=sum;i++)
    printf("%-7d %-8d %-8d %-8d\n",i,date[i].shouru,date[i].zhichu,date[i].yue);
  win();
}

void Over()
{
  int i;
  all();
  printf("|  编号  | 收入 | 支出 |  余额  |\n");
  for (i=1;i<=sum;i++)
    if (date[i].yue<0)
      printf("%-7d %-8d %-8d %-8d\n",i,date[i].shouru,date[i].zhichu,date[i].yue);
  win();
}

void Lookup()
{
  int a,b,i;
  all();
  printf("请输入A,B将查找编号A——B的数据:");
  scanf("%d%d",&a,&b);
  printf("|  编号  | 收入 | 支出 |  余额  |\n");
  for (i=a;i<=b;i++)
    printf("%-7d %-8d %-8d %-8d\n",i,date[i].shouru,date[i].zhichu,date[i].yue);
  win();
}

void win()
{
  int o;
  printf("+-------------------------------------------------+\n");
  printf("|                                                 |\n");
  printf("|                欢迎来到财务管理系统             |\n");
  printf("|                                                 |\n");
  printf("+-------------------------------------------------+\n");
  printf("| 1.改变用户              2.输入数据              |\n");
  printf("| 3.查找数据              4.透支警告              |\n");
  printf("| 5.显示全部              0.关闭程序              |\n");
  printf("+-------------------------------------------------+\n");
  printf("请输入你的选择:");
  scanf("%d",&o);
  switch(o)
   {
     case 0: break;
     case 1: Login(); break;
     case 2: Input(); break;
     case 3: Lookup(); break;
     case 4: Over(); break;
     case 5: Pr(); break;
   }
}

void main()
{
  Login();

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