Slip 21_2, Slip 24_2 : Read the data from the file “employee.txt” and sort on names in alphabetical order (use strcmp) using insertion sort or selection sort.

-

 Solution : Using Insertion 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 InsertionSort(struct employee a[],int n)

{ int i,j;

 struct employee key;

 for(i=1; i<n; i++)

 {

 key=a[i];

 for(j=i-1; j>=0; j--)

 {

 if(strcmp(a[j].name,key.name)>0)

 {

 a[j+1]=a[j];

 }

 else

 break;

 }

 a[j+1]=key;

 }

}

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

{

 int i=0;

 FILE*fp;

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

 {

 for(i=0;i<n;i++)

 {

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

 }

 }

}

int main()

{

 int n;

 n=readfile(emp);

 if(n==-1)

 printf("File Not Found");

 else

 {

 InsertionSort(emp,n);

 writefile(emp,n);

 printf("File Sorted");

 }

}

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