try yourself |run program

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

struct student{
char stName[100];
char stMob[15];
char stAddress[300];
};

void main(){
struct student st1,st2;
clrscr();
puts("Enter name of student:");
gets(st1.stName);
puts("Enter mobile number of student:");
gets(st1.stMob);
puts("Enter address of student:");
gets(st1.stAddress);
printf("\n******************************\n");
puts("Enter name of student:");
gets(st2.stName);
puts("Enter mobile number of student:");
gets(st2.stMob);
puts("Enter address of student:");
gets(st2.stAddress);
printf("\n========student details==========");
printf("\nName of student: ");
printf(st1.stName);
printf("\nStudent mobile number: ");
printf(st1.stMob);
printf("\nAddress of student: ");
printf(st1.stAddress);
printf("\n--------------------------------");
printf("\nName of student:");
printf(st2.stName);
printf("\nStudent mobile number:");
printf(st2.stMob);
printf("\nAddress of student:");
printf(st2.stAddress);
getch();
}

Program Output

Enter name of student:
Rahul Kumar
Enter mobile number of student:
9971366710
Enter address of student:
New Delhi, India
******************************
Enter name of student:
Krishna Kumar
Enter mobile number of student:
9717983128
Enter address of student:
Buxar, India
========student details==========
Name of student: Rahul Kumar
Student mobile number: 9971366710
Address of student: New Delhi, India
--------------------------------
Name of student:Krishna Kumar
Student mobile number:9717983128
Address of student:Buxar, India