Slip 23_2: Read the data from file ‘sortedcities.txt’ containing sorted names of cities and their STD codes. Accept a name of the city from user and use binary search algorithm to check whether the name is present in the file and output the STD code, otherwise output “city not in the list”.

-

 Solution :

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

struct city

{

 char name[20];

 int code;

}ct[10];

int readFile(struct city a[])

{

 int i=0;

 FILE *fp;

 if((fp=fopen("sortedfile.txt","r"))!=NULL)

 {

 while(!feof(fp))

 {

 fscanf(fp,"%s%d",&a[i].name,&a[i].code);

 i++;

 }

}

 return i-1;

}

int binarysearch(struct city a[10],int lb,int ub,char sr[20])

{

 int mid=0;

 while(lb<=ub)

 {

 mid=(lb+ub)/2;

 if(strcmp(a[mid].name,sr)==0)

 return mid;

 else if(strcmp(sr,a[mid].name)<0)

 ub=mid-1;

 else

 lb=mid+1;

 }

 return -1;

}

main()

{ int n,p;

 char sr[20];

 n=readFile(ct);

 if(n==-1)

 printf("File not found ");

 else

 {

 printf("Enter city name to search ");

 scanf("%s",sr);

 p=binarysearch(ct,0,n,sr);

 if(p>=0)

 printf("\nCity is found and code =%d ",ct[p].code);

 else

 printf("\nCity not found ");

 }

}

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