C program on Binary Search Algorithm

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This program uses the Binary search algorithm works as:- first sorts the strings entered and then searches the demanded string's address.


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#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
  int i,j,n,f,l,flag,mid;
  char str[20][100],temp[20];
  char word[100];
  clrscr();
  puts("\t\nEnter the no. of string to be sorted:");
  scanf("%d",&n);
  f=0,l=n;

  printf("Enter %d strings(must not be longer than 100 words)\nput a ENTER when one string ends:\n",n);
  for(i=0;i<=n;i++)
      gets(str[i]);

  //sorting the string
  for(i=0;i<=n;i++)
      {
      for(j=i+1;j<=n;j++)
 {
    if(strcmp(str[i],str[j])>0)
    {
        strcpy(temp,str[i]);
       strcpy(str[i],str[j]);
       strcpy(str[j],temp);
    }
 }
      }
  printf("The sorted string\n");
  for(i=0;i<=n;i++)
      puts(str[i]);

  printf("\n\n\tEnter a word:");
  gets(word);
  //searching a string
  while(f<=l)
 {
   mid=(f+l)/2;
   flag=strcmp(word,str[mid]);
   if(flag==0)
  {
  printf("String found at %d position",mid);
  break;
  }
   else if(flag>0) f=mid+1;
   else l=mid-1;
   }
   if(flag!=0) printf("strring NOT FOUND");
  getch();
  return 0;
}

OUTPUT: -

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