银行帐目管理程序

#include<stdio.h>
#include<string.h>
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);
}