Slip10_2, 30_1 : Read the data from the file “employee.txt” and sort on names in alphabetical order (use strcmp) using bubble sort or selection sort

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 Solution :Using Bubble sort

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

struct employee

{

 char name[20];

 int age;

}emp[10];

int readfile(struct employee a[10])

{

 int i=0;

 FILE*fp;

 if((fp=fopen("empl.txt","r"))!=NULL)

 {

 while(!feof(fp))

 {

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

 i++;

 }

 }

 return i-1;

}

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

{

 int i;

 FILE *fp;

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

 {

 for(i=0;i<n;i++)

 {

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

 }

 }

}

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

{

 int i,j;

 struct employee temp;

 for(i=0;i<n-1;i++)

 {

 for(j=0;j<n-1;j++)

 {

 if(strcmp(a[j].name,a[j+1].name)>0)

 {

 temp=a[j];

 a[j]=a[j+1];

 a[j+1]=temp;

 }

 }

 }

}

main()

{

 int n;

 n=readfile(emp);

 if(n==-1)

 printf("File is not found");

 else

 {

 bubblesort(emp,n);

 writefile(emp,n);

 printf("File is found");

 }

}


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