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Is it possible to arange lines in a file alphabetically?

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Re: Is it possible to arange lines in a file alphabetically?

#11

Nov 20th, 2006

Did that...works...tried to use qsort..getting a bunch of errors...losing temper.

Can you please just type the rest of the code for me? This isn't even part of my course, I just want to sort my <snip> music.

Last edited by Ancient Dragon; Nov 20th, 2006 at 4:00 pm.

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Re: Is it possible to arange lines in a file alphabetically?

#12

Nov 20th, 2006

Study the links which I have given you, my writing the code wont help you in any way.

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Re: Is it possible to arange lines in a file alphabetically?

#13

Nov 20th, 2006

>This isn't even part of my course, I just want to sort my <snip> music.

I don't believe you. I think this is homework and you are trying to trick me.

Last edited by Ancient Dragon; Nov 20th, 2006 at 4:02 pm.

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Re: Is it possible to arange lines in a file alphabetically?

#14

Nov 20th, 2006

I have studied the links and written a code that seems identical to the one in the 'solved example' page. Still, I'm getting a 'cannot convert 'int(*)(char *,char *)' to 'int(*)(const void *,const void*)' message, and I don't see why.

Here's the code:

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define numofstr 50
#define strlen 101
int compare(char *,char *);
main(){
FILE *a,*b;
char s[100];                            /*starr - string array*/
int i=0;
char starr[numofstr][strlen];
a=fopen("C:\\C_fajlovi\\non_sorted.txt","r");
b=fopen("C:\\C_fajlovi\\sorted.txt","w");
while(fscanf(a,"%s",&s)!=EOF){
 strcpy(starr[i],s);
    i++;
    }
qsort(starr,numofstr,strlen,compare);
}
int compare(char*a,char*b){
return strcmp(a,b);
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define numofstr 50
#define strlen 101
int compare(char *,char *);
main(){
FILE *a,*b;
char s[100];                            /*starr - string array*/
int i=0;
char starr[numofstr][strlen];
a=fopen("C:\\C_fajlovi\\non_sorted.txt","r");
b=fopen("C:\\C_fajlovi\\sorted.txt","w");
while(fscanf(a,"%s",&s)!=EOF){
 strcpy(starr[i],s);
    i++;
    }
qsort(starr,numofstr,strlen,compare);
}
int compare(char*a,char*b){
return strcmp(a,b);
}

Whyyyyy?

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Re: Is it possible to arange lines in a file alphabetically?

#15

Nov 20th, 2006

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Originally Posted by iamthwee

>This isn't even part of my course, I just want to sort my <snip> music.

I don't believe you. I think this is homework and you are trying to trick me.

I'm studying at an electrical engineering university. I don't have homework and I'm not trying to trick you. If you're gonna post I'd rather you tell me what's wrong with my code.

Last edited by Ancient Dragon; Nov 20th, 2006 at 4:02 pm.

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Re: Is it possible to arange lines in a file alphabetically?

#16

Nov 20th, 2006

I wouldn't use strlen as a variable since it is an actual function.

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Re: Is it possible to arange lines in a file alphabetically?

#17

Nov 20th, 2006

Hmm looks like the code sample is broken.

Try this:

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
 int compare_ints( const void* a, const void* b ) {
   char* arg1 = (char*) a;
   char* arg2 = (char*) b;
   return strcmp( arg1, arg2 ) ;
 }
 int compare_ints( const void* a, const void* b ) {
   char* arg1 = (char*) a;
   char* arg2 = (char*) b;
   return strcmp( arg1, arg2 ) ;
 }

Last edited by ~s.o.s~; Nov 20th, 2006 at 2:52 pm.

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Re: Is it possible to arange lines in a file alphabetically?

#18

Nov 20th, 2006

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define numofstr 50
#define strleng 101
int compare_ints(const void *,const void *);
main(){
FILE *a,*b;
char s[100];                            /*starr - string array*/
int i=0;
char starr[numofstr][strleng];
a=fopen("C:\\C_fajlovi\\non_sorted.txt","r");
b=fopen("C:\\C_fajlovi\\sorted.txt","w");
while(fscanf(a,"%s",&s)!=EOF){
 strcpy(starr[i],s);
    i++;
    }
qsort(starr,numofstr,strleng,compare_ints);
for(i=0;i<numofstr;i++)
 fprintf(b,"%s\n",starr[i]);
}
int compare_ints( const void* a, const void* b ) {
   char* arg1 = (char*) a;
   char* arg2 = (char*) b;
   return strcmp( arg1, arg2 ) ;
 }
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define numofstr 50
#define strleng 101
int compare_ints(const void *,const void *);
main(){
FILE *a,*b;
char s[100];                            /*starr - string array*/
int i=0;
char starr[numofstr][strleng];
a=fopen("C:\\C_fajlovi\\non_sorted.txt","r");
b=fopen("C:\\C_fajlovi\\sorted.txt","w");
while(fscanf(a,"%s",&s)!=EOF){
 strcpy(starr[i],s);
    i++;
    }
qsort(starr,numofstr,strleng,compare_ints);
for(i=0;i<numofstr;i++)
 fprintf(b,"%s\n",starr[i]);
}
int compare_ints( const void* a, const void* b ) {
   char* arg1 = (char*) a;
   char* arg2 = (char*) b;
   return strcmp( arg1, arg2 ) ;
 }

That would be the whole thing with the last change. Now it doesn't report any errors but I get a Access violation at address...' pop-up and it creates a file called 'sorted.txt' but it stays empty.

Last edited by Sin-da-cat; Nov 20th, 2006 at 3:04 pm.

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Re: Is it possible to arange lines in a file alphabetically?

-1

#19

Nov 20th, 2006

starr expects a 2d array

What do you think this is...

strcpy(starr[i],s);

Is that a 2d array?

No offence but I'd scrap that and try again. SOS has given you a crappy example ha ha.

Last edited by iamthwee; Nov 20th, 2006 at 3:08 pm.

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Re: Is it possible to arange lines in a file alphabetically?

#20

Nov 20th, 2006

fscanf( ) accpets the addr of the variable where the data is to be stored.

What you have is:

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
while(fscanf(a,"%s",&s)!=EOF)
while(fscanf(a,"%s",&s)!=EOF)

Try replacing &s by &s[0] or s and then see.

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No offence but I'd scrap that and try again. SOS has given you a crappy example ha ha.

If you cant help atleast keep your bad sense of humour to yourself.

Last edited by ~s.o.s~; Nov 20th, 2006 at 3:12 pm.

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