I have to create a program in C and not C++, that allows the user to create a file that stores names and numbers, displays them and sorts the dates by names or numbers using Bubble sorting. I know how to create a program that sorts names and numbers that are entered from a keyboard, but don't know how to do it whit a file. If anyone knows please at least show me an example. Thanks.

This is the program i written so far.

#define _CRT_SECURE_NO_WARNINGS
#include<stdlib.h>
#include<stdio.h>
#include<conio.h>

FILE *f;
struct dates{
	char name;
	int num;
    }list;
    int s,i;
int create(){
   
   

  printf("Enter total numbers of elements: ");
  scanf("%d",&s);

  f=fopen("Bubble.txt", "w");

  printf("Enter %d elements:\n ",s);
  for(i=0;i<s;i++){
	  printf("Name:\n");
          scanf("%s",&list.name);
	  fflush(stdin);

	  printf("Number:\n");
	  scanf("%d",&list.num);
	  fwrite(&list,sizeof(list),1,f);
  }
	  fclose(f);
	  return 0;
}
	  
  
int display()
 {      
  f=fopen("Bubble.txt", "r");
  
  printf("---Names and numbers:--\n ");
  printf("| Nr.| Nume   | Numar |\n");
  i=1;
  fread(&list,sizeof(list),1,f);
  while (!feof(f))
  {
  
  printf(" | %d  | %6s | %5d |\n", 
   i++,
   list.name,
   list.num);
  fread(&list,sizeof(list),1,f);
  
  }
  printf("\n");
  fclose(f);
  return 0;
}
  

int bubble()
{   

    //Bubble 	sorting function
    
    return 0;
}	 

  int main(void)
	  {
	int option;
	while (1)

	{
	printf("           ------- M E N I U ------\n");
	printf("         ----- Choose an option ----\n");
        printf("\n");
	printf("              1 - Create the file\n");
	printf("              2 - Display the file\n");
	printf("              3 - Bubble sorting\n");
	printf("              4 - Exist the program\n");
	scanf("%d",&option); fflush(stdin);
	switch (option)
	{
	case 1: create(); break;
	case 2: display(); break;
        case 3: bubble(); break;
	case 4: exit(1);

	default: printf("Alegeti optia corect\n"); break;
	} }
	   _getch();
	}

Edited 5 Years Ago by JohnQ002: n/a

I know how to create a program that sorts names and numbers that are entered from a keyboard, but don't know how to do it whit a file.

Read the file into memory, then sort it as you normally would. While it's possible to sort the file without loading it into memory completely (Google "external sorting"), such methods are quite a bit more complex than in-memory sorting. I also don't believe that your requirements are asking for an external sort.

This is an updated version of the program with a bubble sorting function in it, but it doesn't sort the way it should. If someone knows what I did wrong, please tell me.

#define _CRT_SECURE_NO_WARNINGS
#include<stdlib.h>
#include<stdio.h>
#include<conio.h>

FILE *f;
struct dates{
	char name[10];
	int num;
    }list, list2;
    int s,i;
int create(){
   
   

  printf("Enter total numbers of elements: ");
  scanf("%d",&s);

  f=fopen("Bubble.txt", "w");

  printf("Enter %d elements:\n ",s);
  for(i=0;i<s;i++){
	  printf("Name:\n");
          scanf("%s",&list.name);
	  fflush(stdin);
	  printf("Number:\n");
	  scanf("%d",&list.num);
	  fwrite(&list,sizeof(list),1,f);
  }
	  fclose(f);
	  return 0;
}
	  
  
int display()
 {      
  f=fopen("Bubble.txt", "r");
  
  printf("---Names and numbers:--\n ");
  printf("| Nr.| Nume   | Numar |\n");
  i=1;
  fread(&list2,sizeof(list2),1,f);
  while (!feof(f))
  {
  
  printf(" | %d  | %6s | %5d |\n", 
   i++,
   list2.name,
   list2.num);
  fread(&list2,sizeof(list2),1,f);
  
  }
  printf("\n");
  fclose(f);
  return 0;
}
  

int bubble()
{   

    //Bubble 	sorting function
	      f=fopen("Bubble.txt", "r");
              struct dates arr[5];
              fread(&list2,sizeof(list2),1,f);
              int i=0;

           
           while (!feof(f))
           {
              arr[i]=list2;
              i++;
             fread(&list2,sizeof(list2),1,f);
           }

int j,k;

for(j=0; j<i; j++)
  {
     for(k=0; k<i; k++)
       {
          if(arr[k].num>arr[k+1].num)
          {
               struct dates temp=arr[k]; 
               arr[k]=arr[k+1];
               arr[k+1]=temp;
          }
      }
   }


  fclose(f);
  f=fopen("Bubble.txt", "w");
  

    for(j=0; j<i; j++)
     {
          struct dates temp=arr[j];
          fwrite(&temp,sizeof(temp),1,f);
      }

   fclose(f);
   return 0;
}	 

  int main()
	  {
			int option;
	while (1)

	{
	printf("         ------- M E N I U --------\n");
	printf("         ----- Choose an option ----\n");
        printf("\n");
	printf("           1 - Create the file\n");
	printf("           2 - Display the file\n");
	printf("           3 - Bubble sorting\n");
	printf("           4 - Exist the program\n");
	scanf("%d",&option); fflush(stdin);
	switch (option)
	{
	case 1: create(); break;
	case 2: display(); break;
        case 3: bubble(); break;
  	case 4: exit(1);

	default: printf("Choose the correct option\n"); break;
	} }
	   return 0;
	}

Edited 5 Years Ago by JohnQ002: n/a

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