Student Management System

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

FILE *fp;

struct students {
	char firstname[30];
	char lastname[30];
	char roll_no[20];
	char s_class[30];
	char address[50];
	char percentage[20];
} s ;

void addstudent();
void allstudent();
void search();
void delete();

int main() {
	system("cls");
	int ch, co ;
	printf("\t\t\t\t\t<== Welcome to Student Management System ==> \n\n");
	printf("1. Add Student \n");
	printf("2. All Students \n");
	printf("3. Reover Student \n");
	printf("4. Search Student \n");
	printf("Choose Your Choice --> ");
	scanf("%d",&ch);
	switch(ch) {
		case 1 :
			addstudent();
			break;
		case 2 :
			allstudent();
			break;
		case 3 :
			delete();
			break;
		case 4 :
		    search();
			break;
		default :
			printf("\t\t\t\t\t\n<== Please Choose a Correct Option Please ==> \n");
			printf("Do you Want To Do It Again \n Press [ 1 ] ---> \t ");
			scanf("%d",&co);
			if(co==1) {
				main();
			} else {
				printf("\t\t\t\t\t\n <== Thanks For Usinf Our Student Management System ==> \n");
			}
	}
}
void  addstudent() {
	FILE *fp;
	struct students s;
	int an;
	do {
		system("cls");
		fp=fopen("Student.txt","a+");
		printf("\t\t\t\t\t\n <== Add Student ==> \n");
		printf("Enter First Name -- > \t");
		scanf("%s",&s.firstname);
		printf("Enter Second Name --> \t");
		scanf("%s",&s.lastname);
		printf("Enter Roll Number --> \t");
		scanf("%s",&s.roll_no);
		printf("Enter Class --> \t");
		scanf("%s",&s.s_class);
		printf("Enter Address --> \t");
		scanf("%s",&s.address);
		fflush(stdin);
		printf("Enter Percentage --> \t");
		scanf("%s",&s.percentage);
		if(fp==NULL) {
			fprintf(stderr,"\t\t\t\t\t\n<== Unable To Store Record ==> \n");
		} else {
			printf("\t\t\t\t\t\t\n<== Student Added Successfully ==> \n");
		}
			fwrite(&s,sizeof(struct students),1,fp);
			fclose(fp);
		printf("Do you Want To Add Another Student PRESS [ 1 ] --> \t");
		scanf("%d",&an);
	} while(an==1);
	main();
}

void allstudent() {
	FILE *fp;
	struct students s;
	system("cls");
	fp=fopen("student.txt","r");
	printf("\t\t\t\t\t\n<== All Student Record ==> \n\n");
	if(fp==NULL){
		printf(stderr,"Unable To Open File \\n");
		exit(0);
	}
	else{
	while(fread(&s,sizeof(struct students),1,fp)>0){
	printf("\n\t<------------------------------> \n\n");
	printf("\tFirst Name   --> \t%s\n",s.firstname);
	printf("\tLast Name    --> \t%s\n",s.lastname);
	printf("\tRoll Number  --> \t%s\n",s.roll_no);
	printf("\tClass        --> \t%s\n",s.s_class);
	printf("\tAddress      --> \t%s\n",s.address);
	printf("\tPercentage   --> \t%s\n",s.percentage);
	printf("\n\t<------------------------------>\n");
    }
    }
	fclose(fp);
	getch();
	main();
}

void search() {
    FILE *fp;
	struct students s;
	char sr[20];
	int found = 0 ;
	system("cls");
	fp=fopen("student.txt","r");
	printf("\t\t\t\t\t\n<== All Student Record ==> \n\n");
	printf("Enter The Roll Number --> ");
	scanf("%s",&sr);
	if(fp==NULL){
		printf(stderr,"Unable To Open File \\n");
		exit(0);
	}
	else{
	while(fread(&s,sizeof(struct students),1,fp)>0){
	if(strcmp(sr,s.roll_no)==0){
	found = 1;
	printf("\n\t<------------------------------> \n\n");
	printf("\tFirst Name   --> \t%s\n",s.firstname);
	printf("\tLast Name    --> \t%s\n",s.lastname);
	printf("\tRoll Number  --> \t%s\n",s.roll_no);
	printf("\tClass        --> \t%s\n",s.s_class);
	printf("\tAddress      --> \t%s\n",s.address);
	printf("\tPercentage   --> \t%s\n",s.percentage);
	printf("\n\t<------------------------------>\n");
    }
    }
    if(found == 1){
    	printf("\t\t\t\t\t\n<== Record Found ==> \n");
	}
    }
	fclose(fp);
	getch();
	main();
}
void delete(){
	FILE *fp , *ft;
	struct students s;
	printf("\t\t\t\t\t\n<== Delete Student ==>\n");
	fp=fopen("student.txt","r");
	ft=fopen("temp.txt","w");
	char sr[20];
	int found = 0;
	printf("Enter The Roll Number --> ");
	scanf("%s",&sr);
	if(fp==NULL){
        fprintf(stderr,"can't open file\n");
        exit(0);
    }
    while(fread(&s,sizeof(struct students),1,fp)>0){
	if(strcmp(sr,s.roll_no)==0){
	found = 1;
    }
    else{
           fwrite(&s,sizeof(struct students),1,ft);
    }
}
    fclose(fp);
    fclose(ft);
    if(!found){
        printf("\n\t\t\t\tRecord not found\n");
        }
      if(found){ 
        remove("student.txt");
        rename("temp.txt","student.txt");
        printf("\n\t\t\t\tRecord deleted succesfully\n");
        }
  getch();
  main();
}