C语言实现的银行帐目管理程序

作者：oopul  

#include
#include
struct bankdata{    /*定义一个结构体*/
int num;
char name[20];
float balance;
}
create(FILE *ptr)/*创建具有结构体的空文档*/
{int num;
 struct bankdata data={-1,"NONAME",0};
 for(num=0;num<=15;num++){
      fseek(ptr,num*sizeof(struct bankdata),SEEK_SET);
      fwrite(&data,sizeof(struct bankdata),1,ptr);
      }
 }
view(FILE *ptr)/*查看文档内容*/
{int num;
 struct bankdata data;
 clrscr();
 for(num=0;num<=15;num++){
       fseek(ptr,num*sizeof(struct bankdata),SEEK_SET);
       fread(&data,sizeof(struct bankdata),1,ptr);
       printf("%-10d%-16s%-10f\n",data.num,data.name,data.balance);
       }
}
add(FILE *ptr)/*添加一个帐目*/
{int num;
 struct bankdata data;
 printf("Enter new account number(0-15):\n");
 scanf("%d",&num);
 fseek(ptr,num*sizeof(struct bankdata),SEEK_SET);
 fread(&data,sizeof(struct bankdata),1,ptr);
 if(data.num!=-1)
   printf("Account %d already contains informaton.\n",num);
 else{
      printf("Enter name.\n");
      scanf("%s",data.name);
      printf("Enter balance.\n");
      scanf("%f",&data.balance);
      data.num=num;
      }
 fseek(ptr,data.num*sizeof(struct bankdata),SEEK_SET);
 fwrite(&data,sizeof(struct bankdata),1,ptr);
 }
delete(FILE *ptr)/*删除一个帐目*/
{int num,num2;
 int num1[16]={-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1};
 char name1[20];
 char name2[20];
 struct bankdata blankdata={-1,"NONAME",0};
 struct bankdata data;
 printf("Enter delete name.\n");
 scanf("%s",name1);
 for(num=0;num<=15;num++){
  fseek(ptr,num*(sizeof(struct bankdata))+sizeof(int),SEEK_SET);
  fread(name2,20,1,ptr);
  if(strcmp(name1,name2)==0) num1[num]=num;
  }
 for(num=0,num2=0;num<=15;num++){
  if(num1[num]!=-1) {
   fseek(ptr,num*sizeof(struct bankdata),SEEK_SET);
   fread(&data,sizeof(struct bankdata),1,ptr);
   printf("%-10d%-16s%-10f\n",data.num,data.name,data.balance);
   num2++;
   }
  }
 if(num2>1){
 printf("Which account do you want to delete?\n");
 scanf("%d",&num);
 fseek(ptr,num*sizeof(struct bankdata),SEEK_SET);
 fwrite(&blankdata,sizeof(struct bankdata),1,ptr);
 }
 if(num2==1){
  fseek(ptr,data.num*sizeof(struct bankdata),SEEK_SET);
  fwrite(&blankdata,sizeof(struct bankdata),1,ptr);
 }
 if(num2==0) printf("There is no your name.\n");
}
modify(FILE *ptr)/*修改帐目*/
{int num,num2;
 int num3[16]={-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1};
 float num1;
 char name1[20];
 char name2[20];
 struct bankdata data;
 printf("Enter modify name.\n");
 scanf("%s",name1);
 for(num=0;num<=15;num++){
  fseek(ptr,num*(sizeof(struct bankdata))+sizeof(int),SEEK_SET);
  fread(name2,20,1,ptr);
  if(strcmp(name1,name2)==0) num3[num]=num;
  }
 for(num=0,num2=0;num<=15;num++){
  if(num3[num]!=-1) {
   fseek(ptr,num*sizeof(struct bankdata),SEEK_SET);
   fread(&data,sizeof(struct bankdata),1,ptr);
   printf("%-10d%-16s%-10f\n",data.num,data.name,data.balance);
   num2++;
   }
  }
 if(num2>1){
  printf("Which account do you want to modify?\n");
  scanf("%d",&num);
  fseek(ptr,num*sizeof(struct bankdata),SEEK_SET);
  fread(&data,sizeof(struct bankdata),1,ptr);
  printf("Enter charge(+) or payment(-)\n");
  scanf("%f",&num1);
  data.balance+=num1;
  fseek(ptr,num*sizeof(struct bankdata),SEEK_SET);
  fwrite(&data,sizeof(struct bankdata),1,ptr);
  }
 if(num2==1){
  printf("Enter charge(+) or payment(-)\n");
  scanf("%f",&num1);
  data.balance+=num1;
  fseek(ptr,data.num*sizeof(struct bankdata),SEEK_SET);
  fwrite(&data,sizeof(struct bankdata),1,ptr);
  }
 if(num2==0) printf("There is no your name.\n");
 }
main()
{FILE *fptr;
 int choice=0;
 if((fptr=fopen("d:\\account.txt","r++"))==NULL)
   printf("File couldn't be opened.\n");
 else{
       while(choice!=5){
       printf("\nEnter your choice\n"/*菜单*/
       "0-create account\n"
       "1-view account\n"
       "2-add account\n"
       "3-delete account\n"
       "4-modify account\n"
       "5-quit\n"
       );
       scanf("%d",&choice);
       switch(choice){
   case 0:create(fptr);break;
   case 1:view(fptr);break;
   case 2:add(fptr);break;
   case 3:delete(fptr);break;
   case 4:modify(fptr);break;
   }
       }
}
fclose(fptr);
return(0);
}