Suppose a file contains student’s records with each record containing name and age of a student. Write a program to read these records and display them in sorted order by name.

File (c).txt

Siraj 21
Azad 20
Shafinaz 21
Sagar 20
Ruksana 19
Farzana 15
Rizwan 14
Gulabsa 21
Pinku 20
Nazia 19
Deepak 20

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>

void sort_names(char**, int);
void swap(char*, char*);

int main()
{
	char ch = 'i', *help[30], name[50], *p;
	int i, j, tot_names;
	FILE *fp;
	fp = fopen("File (c).txt", "r+");
	if (fp == NULL)
	{
		printf("\nCannot open the file.\n");
		exit(1);
	}
	for (i = 0; ch != EOF; i++)
	{
		ch = fgetc(fp);
		for (j = 0; ch != '\n'; j++)
		{
			if (ch == EOF)
				break;

			name[j] = ch;
			ch = fgetc(fp);
		}

		//To terminate the string
		name[j] = '\0';

		/*Saveing the name is array of pointers*/
		p = (char*)malloc(50);
		strcpy(p, name);
		help[i] = p;
	}
	tot_names = i - 1;

	sort_names(help, tot_names);

	//Displaying the content
	for (j = 0; j <= tot_names; j++)
		puts(help[j]);

	fclose(fp);
	_getch();
	return 0;
}

void swap(char *a, char *b)
{
	char temp[20];
	strcpy(temp, a);
	strcpy(a, b);
	strcpy(b, temp);
}

void sort_names(char** name_list, int tot_names)
{
	int i, j, k = 0;

	for (i = 0; i <= tot_names; i++)
	{
		for (j = i + 1; j <= tot_names; j++)
		{
			/*If the name starts with same letter,
			so it checks the next letter of that name*/
			for (k = 0; name_list[i][k] == name_list[j][k]; k++);

			if (name_list[i][k] > name_list[j][k])
				swap(name_list[j], name_list[i]);
		}
	}
}