Search String in File Using C programming

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I am creating Student Information system in C language.
the Structure is

struct { char firstname[20];
char pass[20];
}student;

Print the String in File with Below Format

C++

fprintf(fp,"%d\t\t%s\t\t P\t\t%d:%d:%d\t\t\n",index,student.firstname,t.ti_hour,t.ti_min,t.ti_sec);

<pre lang="cs">void searchname()
{  int index;
found=0;
fp=fopen("attdb.txt","r");
if(fp == NULL)
    {
     outtextxy(100,450,"! The File is Empty...\n\n");
     }
      else
    {
    outtextxy(100,300,"\nEnter student first name:");
     scanf("%s",&studentname);
    do
    {      
    fscanf(fp,"%d\t\t%s",index,student.firstname);
    length = strlen(student.firstname);
    if(student.firstname[length]==studentname[length])
    found=1;
    }while(!feof(fp));
}
 if(found==1)
 {
    outtextxy(100,400,"\nThe record is found.");
    getch();
  }
 else
 {
     outtextxy(100,400,";Not found...\n");

 }

its is gone in infinite loop...

Posted 26-Jun-14 21:36pm

Parth Akbari

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4 solutions

Solution 1

You might want to include || found != 1 in your while loop condition.

Good luck!

Posted 26-Jun-14 21:39pm

E.F. Nijboer

Comments

Parth Akbari 27-Jun-14 4:12am

i Add in my loop but still going in infinite loop.while((!feof(fp)) || (found!=1));
is there any mistake in fscanf "\t" may problem with reading.
HERE is my TXT file structure "http://s28.postimg.org/43dqgfafx/screenshot_2014_06_27.jpg"

Solution 2

C#

fp=fopen("attdb.txt","r");
if(fp == NULL)    <=== try changing == to !=

:-0 My apologies, my eyes did not see the formatting correctly. :-0

Posted 27-Jun-14 4:48am

jeron1

Updated 27-Jun-14 8:31am

v2

Comments

Parth Akbari 27-Jun-14 12:36pm

no .... its not work...its gives "The File is Empty.." and "Not found..." message...

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Richard MacCutchan · Accepted Answer · 2014-06-27T07:49:00

C++

   if(student.firstname[length]==studentname[length])
    found=1;
    }while(!feof(fp));
}

This is not going to work, you need to use a proper string comparison function to check if the names match. You also do not need the ampersand & On the variable name when scanning a string input field.

Michael Haephrati · Accepted Answer · 2014-06-29T09:31:00

I would change

C++

do
{
fscanf(fp,"%d\t\t%s",index,student.firstname);
length = strlen(student.firstname);
if(student.firstname[length]==studentname[length])
found=1;
}while(!feof(fp));

to

C++

while !feof(fp)
{
    fscanf(fp,"%d\t\t%s",index,student.firstname);
    length = strlen(student.firstname);
    if(student.firstname[length]==studentname[length])
        break;
}

Search String in File Using C programming

4 solutions

Solution 3

Solution 4

Solution 1

Solution 2

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