Slip27_1 : Read the data from the file and sort on names in alphabetical order (use strcmp) using Merge sort and write the sorted data to another file 'sortedemponname.txt'

-

 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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