Slip 9_1: Read the data from the ‘employee.txt’ file and sort on age using Counting sort or Quick sort and write the sorted data to another file 'sortedemponage.txt'.

-

 Solution : Using Quick sort

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

struct employee

{

 char name[20];

 int age;

}emp[10];

int readFile(struct employee a[])

{

 int i=0;

 FILE *fp;

 if((fp=fopen("emp.txt","r"))!=NULL)

 {

 while(!feof(fp))

 {

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

 i++;

 }

 }

 return i-1;

}

void quicksort(struct employee a[10],int lb,int ub)

{ int i,j;

 struct employee key,temp;

 if(lb<ub)

{

i=lb+1;

 key=a[lb];

 j=ub;

 while(i<=j)

 {

 while(a[i].age<=key.age && i<=ub)

 i++;

 while(a[j].age>key.age && j>=lb)

 j--;

 if(i<j)

 {

 temp=a[i];

 a[i]=a[j];

 a[j]=temp;

 }

 }

 //swap key and a[j]

 temp=a[j];

 a[j]=a[lb];

 a[lb]=temp;

 quicksort(a,lb,j-1);

 quicksort(a,j+1,ub);

 }

}

void writeFile(struct employee a[],int n)

{

 int i=0;

 FILE *fp;

 if((fp=fopen("sortedemp_quick_age.txt","w"))!=NULL)

 {

 for(i=0;i<n;i++)

 { fprintf(fp,"%s %d\n",a[i].name,a[i].age);

 }

 }

}

main()

{ int n;

 n=readFile(emp);

 if(n==-1)

 printf("File not found ");

 else

 {

 quicksort(emp,0,n-1);

 writeFile(emp,n);

 printf("File Sorted ");

}

}



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