Question

我想运行非常非常简单的库系统代码。似乎该代码是完全正确的，但我不知道为什么该代码正确工作。它给了我2错误：

此处不允许在'{'标记之前的功能定义

在输入末尾出现'}'

您能帮我解决这个问题吗？

#include<windows.h>
#include<stdio.h>
#include<conio.h>
#include <stdlib.h>
#include<string.h>                  //contains strcmp(),strcpy(),strlen(),etc
char catagories[][15]={"Computer","Electronics","Electrical","Civil","Mechnnical","Architecture"};
void returnfunc(void);
void mainmenu(void);
void addbooks(void);
void deletebooks(void);
void viewbooks(void);
void closeapplication(void);
int  getdata();
int t(void);

//void show_mouse(void);
//list of global files that can be acceed form anywhere in program
FILE *fp,*ft,*fs;
COORD coord = {0, 0};
void gotoxy (int x, int y)
{
coord.X = x; coord.Y = y; // X and Y coordinates
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}
//list of global variable
int s;
char findbook;
struct books
{
int id;
char stname[20];
char name[20];
char Author[20];
int quantity;
float Price;
int count;
int rackno;
char *cat;
/*struct books a;
int main()
{
getch();
return 0;
}*/
//struct meroDate issued;
//struct meroDate duedate;
};
void mainmenu()
{

system("cls");
int i;
gotoxy(20,5);
printf("\xDB\xDB\xDB\xDB\xB2 1. Add Books   ");
gotoxy(20,7);
printf("\xDB\xDB\xDB\xDB\xB2 2. Delete books");
gotoxy(20,9);
printf("\xDB\xDB\xDB\xDB\xB2 3. View Book list");
gotoxy(20,15);
gotoxy(20,21);
printf("Enter your choice:");
switch(getch())
{
case '1':
addbooks();
break;
case '2':
deletebooks();
break;
case '3':
viewbooks();
break;
default :
  printf("Invalid \n" );
}
void addbooks(void)    //funtion that add books
{
system("cls");
int i;
gotoxy(20,5);
printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2SELECT CATEGOIES\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");
gotoxy(20,7);
printf("\xDB\xDB\xDB\xDB\xB2 1. Computer");
gotoxy(20,9);
printf("\xDB\xDB\xDB\xDB\xB2 2. Electronics");
gotoxy(20,11);
printf("\xDB\xDB\xDB\xDB\xB2 3. Electrical");
gotoxy(20,13);
printf("\xDB\xDB\xDB\xDB\xB2 4. Civil");
gotoxy(20,15);
printf("\xDB\xDB\xDB\xDB\xB2 5. Mechanical");
gotoxy(20,17);
printf("\xDB\xDB\xDB\xDB\xB2 6. Architecture");
gotoxy(20,19);
printf("\xDB\xDB\xDB\xDB\xB2 7. Back to main menu");
gotoxy(20,21);
printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");
gotoxy(20,22);
printf("Enter your choice:");
scanf("%d",&s);
if(s==7)
mainmenu() ;
system("cls");
mainmenu() ;
system("cls");
fp=fopen("Bibek.dat","ab+");
if(getdata()==1)
{
a.cat=catagories[s-1];
fseek(fp,0,SEEK_END);
fwrite(&a,sizeof(a),1,fp);
fclose(fp);
gotoxy(21,14);
printf("The record is sucessfully saved");
gotoxy(21,15);
printf("Save any more?(Y / N):");
if(getch()=='n')
mainmenu();
else
system("cls");
addbooks();
}
}
void deletebooks()    //function that delete items from file fp
{
system("cls");
int d;
char another='y';
while(another=='y')  //infinite loop
{
system("cls");
gotoxy(10,5);
printf("Enter the Book ID to  delete:");
scanf("%d",&d);
fp=fopen("Bibek.dat","rb+");
rewind(fp);
while(fread(&a,sizeof(a),1,fp)==1)
{
if(a.id==d)
{
gotoxy(10,7);
printf("The book record is available");
gotoxy(10,8);
printf("Book name is %s",a.name);
gotoxy(10,9);
printf("Rack No. is %d",a.rackno);
findbook='t';
}
}
if(findbook!='t')
{
gotoxy(10,10);
printf("No record is found modify the search");
if(getch())
mainmenu();
}
if(findbook=='t' )
{
gotoxy(10,9);
printf("Do you want to delete it?(Y/N):");
if(getch()=='y')
{
ft=fopen("test.dat","wb+");  //temporary file for delete
rewind(fp);
while(fread(&a,sizeof(a),1,fp)==1)
{
if(a.id!=d)
{
fseek(ft,0,SEEK_CUR);
fwrite(&a,sizeof(a),1,ft); //write all in tempory file except that
}                              //we want to delete
}
fclose(ft);
fclose(fp);
remove("Bibek.dat");
rename("test.dat","Bibek.dat"); //copy all item from temporary file to fp except that
fp=fopen("Bibek.dat","rb+");    //we want to delete
if(findbook=='t')
{
gotoxy(10,10);
printf("The record is sucessfully deleted");
gotoxy(10,11);
printf("Delete another record?(Y/N)");
}
}
else
mainmenu();
fflush(stdin);
another=getch();
}   
}
gotoxy(10,15);
mainmenu();
}
void viewbooks(void)  //show the list of book persists in library
{
int i=0,j;
system("cls");
gotoxy(1,1);
printf("*********************************Book List*****************************");
gotoxy(2,2);
printf(" CATEGORY     ID    BOOK NAME     AUTHOR       QTY     PRICE     RackNo ");
j=4;
fp=fopen("Bibek.dat","rb");
while(fread(&a,sizeof(a),1,fp)==1)
{
gotoxy(3,j);
printf("%s",a.cat);
gotoxy(16,j);
printf("%d",a.id);
gotoxy(22,j);
printf("%s",a.name);
gotoxy(36,j);
printf("%s",a.Author);
gotoxy(50,j);
printf("%d",a.quantity);
gotoxy(57,j);
printf("%.2f",a.Price);
gotoxy(69,j);
printf("%d",a.rackno);
printf("\n\n");
j++;
i=i+a.quantity;
}
gotoxy(3,25);
printf("Total Books =%d",i);
fclose(fp);
gotoxy(35,25);
returnfunc();
}
return0;
getch();
}

Answer 1

在代码中的某些地方，您具有以下（简化的）序列：

function()
{
/**/
printf("Enter your choice:");
switch(getch())
{
/**/
}
/* here you do not finalise the current function,
   a } is missing */
void addbooks(void)    //funtion that add books
{
/**/
}

如果您习惯于简洁地缩进所有代码，那么它将看起来像这样

function()
{
    /**/
    printf("Enter your choice:");
    switch(getch())
    {
        /**/
    }
/*?*/

void addbooks(void)    //funtion that add books
{
    /**/
}

...问题将非常明显。

不允许使用C函数定义吗？

1 个答案: