Searching Files

I've looked everywhere and havent been able to find a solution. I have a file that holds the account number and the balance of the account. I want the user to enter the account number and the program tests to see if it is there and returns the balnace. I have tried figuring this out using text files and binary files but havent been able to figure it out yet

Any help would be greatly appreciated.

Try:

Code:

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#include <string.h>
#include <stdio.h>

int findinfile(char *lookforme){
      FILE *in;
      int i,found;
      char *big;
      in=fopen("filename","rb")
      fseek(in,0,SEEK_END);
      i=(int) ftell(in);
      big = calloc(1+i,1);
      fread(big,i,1,in);
      found =0;
      if (strstr(big,lookforme) != NULL)
          found = 1;
      fclose(in);
      return found;

}

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