C program to sort names in alphabetical order using structures

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Structure is a collection of different datatype variables, grouped together under a single name.

Features of structure

The features of structure in the C programming language are as follows −

It is possible to copy the contents of all the structure elements of different datatypes to another structure variable of its type by using an assignment operator.
For handling the complex datatypes, it is better to create structure within another structure, which is called nested structures.
It is possible to pass an entire structure, individual elements of structure and an address of structure to a function.
It is possible to create structure pointers.

Declaration and initialization of structures.

General form of structure declaration is as follows −

datatype member1;
   struct tagname{
      datatype member2;
      datatype member n;
};

Here,

struct is the keyword.
tagname specifies name of structure.
member1, member2 are the data items.

For example,

struct book{
   int pages;
   char author [30];
   float price;
};

Program

Following is the C program to sort the names in an alphabetical order by using the structures −

Live Demo

#include<stdio.h>
#include<string.h>
struct tag{
   char name[10];
   int rno;
};
typedef struct tag node;
node s[5];
sort(int no){
   int i,j;
   node temp;
   for(i=0;i<no-1;i++)
   for(j=i+1;j<no;j++)
   if(strcmp(s[i].name,s[j].name)>0){
      temp=s[i];
      s[i]=s[j];
      s[j]=temp;
   }
}
void main(){
   int no,i;
   fflush(stdin);
   printf("Enter The Number Of Students:");
   scanf("%d",&no);
   for(i=0;i<no;i++){
      printf("Enter The Name:");
      fflush(stdin);
      gets(s[i].name);
      printf("Enter the Roll:");
      scanf("%d",&s[i].rno);
   }
   sort(no);
   for(i=0;i<no;i++){
      printf("%s\t",s[i].name);
      printf("%d
",s[i].rno);
   }
}

Output

When the above program is executed, it produces the following result −

Enter The Number of Students:5
Enter The Name:Priya
Enter the Roll:3
Enter The Name:Hari
Enter the Roll:5
Enter The Name:Pinky
Enter the Roll:7
Enter The Name:Lucky
Enter the Roll:1
Enter The Name:Krishna
Enter the Roll:2
Hari 5
Krishna 2
Lucky 1
Pinky 7
Priya 3