can u please fix the in update score and display from big to small for me

#include

#include

#include

#include

#include

struct students{

char name[100];

char sex[100];

char id[100];

char age[100];

char grade[100];

int i;

char score[100];

char tel[100];

float math;

float physic;

float computer;

float khlanguage;

float history;

float sum;

float avg;

float mix;

};

struct students pd[100];

int i,n;

char filename[50];

void addInfo( ){

FILE*f1;

printf(" \tEnter student name: "); scanf("%s",&pd[n].name);

printf("\tEnter student ID: "); scanf("%s",&pd[n].id);

printf("\tEnter Gender: "); scanf("%s",&pd[n].sex);

printf("\tEnter student age: "); scanf("%s",&pd[n].age);

printf("\tEnter student grade: "); scanf("%s",&pd[n].grade);

printf("\tEnter telephone (+885): "); scanf("%s",&pd[n].tel);

i++;

f1 = fopen("student22.txt","a");

fprintf(f1,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel);

fclose(f1);

}

//function to search information of students by id

void searchInfo( ){

char id[100];

FILE*f1;

int flag=0;

f1 = fopen("student22.txt","r");

printf(" \t-------------------------------------------------------------------- ");

printf(" \tSEARCH ID:"); scanf("%s",id);

printf("\t-------------------------------------------------------------------- ");

printf("\tName\tid\tsex\tage\tgrade\ttelephone ");

printf("\t-------------------------------------------------------------------- ");

while(fscanf(f1,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel)!=EOF){

i++;

if(strcmp(pd[n].id,id)==0){

printf("\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel);

flag=1;

}

}

if(flag==0){

printf("\t*****NOT FOUND*****");

}

fclose(f1);

}

// function for display all students information

void displayInfo( ){

FILE*f1;

int i;

f1=fopen("student22.txt","r");

printf(" \t-------------------------------------------------------------------- ");

printf("\tName\tID\tSex\tAge\tGrade\tTel ");

printf("\t-------------------------------------------------------------------- ");

while(fscanf(f1,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel)!=EOF){

i++;

printf("\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel);

printf("\t-------------------------------------------------------------------- ");

}

fclose(f1);

}

// function for delete students informations

void deleteInfo(){

FILE*f1 ;

int id[100],f = 0 ,j;

int flag = 0;

int count = 0,n=0,index;

f1=fopen("student22.txt","r");

printf(" \tEnter ID :");scanf("%s",id);

while(fscanf(f1,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel)!=EOF){

if(strcmp(pd[n].id,id)==0){

printf(" \t\t---<<<<*** We found the student ID to be deleted ***>>>>--- ");

index = n;

}

count++;

n++;

}

n=0;

fclose(f1);

f1=fopen("student22.txt","w");

while(n < count){

if(index == n){

n++;

continue;

}else{

fprintf(f1,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel);

}

n++;

}

fclose(f1);

}

// functions for add score students

void addScore( ){

int k;

char id[100];

FILE*fs,*f1;

f1= fopen("student22.txt","r");

fs=fopen("students_score22.txt","a");

int status=0;

// printf("\tMath\tPhysic\tComputer\tKhmer\tHistory\tScore\tAverage\t ");

printf(" \t-------------------------------------------------------------------- ");

printf(" \tEnter id: ");scanf("%s",id);

while(fscanf(f1,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel)!=EOF){

if(strcmp(pd[i].id,id)==0){

status=1;

printf(" \tInput math score: "); scanf("%f",&pd[i].math);

printf("\tInput physic score: "); scanf("%f",&pd[i].physic);

printf("\tInput computer score: "); scanf("%f",&pd[i].computer);

printf("\tInput khmer score: "); scanf("%f",&pd[i].khlanguage);

printf("\tInput history score: "); scanf("%f",&pd[i].history);

pd[i].sum=pd[i].math + pd[i].physic + pd[i].computer + pd[i].khlanguage + pd[i].history;

pd[i].avg=pd[i].sum/5;

printf("\t*****UPDATE IS DONE***** ");

fprintf(fs," \t%s\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f ",pd[i].id,pd[i].name,pd[i].math,pd[i].physic,pd[i].computer,pd[i].khlanguage,pd[i].history,pd[i].sum,pd[i].avg);

break;

}

}

if (status==0){

printf("\t*****NOT FOUND*****");

}

fclose(f1);

fclose(fs);

}

// update students informations

void updateInfo( ){

char id[100];

int status=0,i=0;

FILE*f1;

FILE *f2;

f1= fopen("student22.txt","r");

f2= fopen("student33.txt","w");

//printf("\tName\tID\tGender\tAge\tGrade\tTel ");

//printf("\t-------------------------------------------------------------------- ");

printf(" \tEnter ID: ");scanf("%s",id);

while(fscanf(f1,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel)!=EOF){

if(strcmp(pd[n].id,id)==0){

status=1;

printf(" \tNew student name: "); scanf("%s",&pd[n].name);

printf("\tNew student ID: "); scanf("%s",&pd[n].id);

printf("\tNew student gender: "); scanf("%s",pd[n].sex);

printf("\tNew Student age: "); scanf("%s",&pd[n].age);

printf("\tNew user grade: "); scanf("%s",&pd[n].grade);

printf("\tNew telephone (+885): "); scanf("%s",&pd[n].tel);

printf("\t*****UPDATE IS DONE***** ");

fprintf(f2,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel);

}

else{

fprintf(f2,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[n].name,pd[n].id,pd[n].sex,pd[n].age,pd[n].grade,pd[n].tel);

}

i++;

}

if (status==0){

printf("\t*****NOT FOUND*****");

}

fclose(f1);

fclose(f2);

remove("student22.txt");

rename("student33.txt","student22.txt");

}

void updateScore(){

char id[100];

int status=0,i=0;

FILE*f3;

FILE *f4;

f3= fopen("students_score22.txt","r");

f4= fopen("student34.txt","w");

//printf("\tName\tID\tGender\tAge\tGrade\tTel ");

//printf("\t-------------------------------------------------------------------- ");

printf(" \tEnter ID: ");scanf("%s",id);

while(fscanf(f3," \t%s\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f ",pd[i].id,pd[i].name,pd[i].math,pd[i].physic,pd[i].computer,pd[i].khlanguage,pd[i].history,pd[i].sum,pd[i].avg)!=EOF){

if(strcmp(pd[n].id,id)==0){

status=1;

printf(" \tInput math score: "); scanf("%f",&pd[i].math);

printf("\tInput physic score: "); scanf("%f",&pd[i].physic);

printf("\tInput computer score: "); scanf("%f",&pd[i].computer);

printf("\tInput khmer score: "); scanf("%f",&pd[i].khlanguage);

printf("\tInput history score: "); scanf("%f",&pd[i].history);

pd[i].sum=pd[i].math + pd[i].physic + pd[i].computer + pd[i].khlanguage + pd[i].history;

pd[i].avg=pd[i].sum/5;

printf("\t*****UPDATE IS DONE***** ");

fprintf(f4," \t%s\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f ",pd[i].id,pd[i].name,pd[i].math,pd[i].physic,pd[i].computer,pd[i].khlanguage,pd[i].history,pd[i].sum,pd[i].avg);

}

else{

fprintf(f4," \t%s\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f ",pd[i].id,pd[i].name,pd[i].math,pd[i].physic,pd[i].computer,pd[i].khlanguage,pd[i].history,pd[i].sum,pd[i].avg);

}

i++;

}

if (status==0){

printf("\t*****NOT FOUND*****");

}

fclose(f3);

fclose(f4);

remove("students_score22.txt");

rename("student34.txt","students_score22.txt");

}

//Function to update score

// function for display score students

void displayScore(){

char math[100],computer[100],physic[100],kh[100],his[100],sum[100],avg[100];

FILE*fs;

int count=0;

fs=fopen("students_score22.txt","r");

int i =0;

printf(" \tid\tname\tmath\tphysic\tcomputer kh\thistory\tSum\tAverage ");

printf("\t-------------------------------------------------------------------- ");

while(fscanf(fs,"\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s ",pd[i].id,pd[i].name, math, physic, computer, kh, his,sum,avg)!=EOF){

printf(" \t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s ",pd[i].id,pd[i].name,math,physic,computer,kh,his,sum,avg);

i++;

}

fclose(fs);

}

// function search male/female students informations

void searchGender(){

char sex[100];

int flag=0;

FILE*f1;

f1=fopen("student22.txt","r");

printf(" \tSEARCH GENDER(M/F):"); scanf("%s",sex);

printf("\tName\tID\tGender\tAge\tGrade\tTel ");

printf("\t-------------------------------------------------------------------- ");

// for(int i=0;i< n;i++){

// if(strcmp(pd[i].sex,sex)==0){

// flag=1;

// printf("\t%s\t%s\t%s\t%s\t%s\t%s ",pd[i].name,pd[i].id,pd[i].sex,pd[i].age,pd[i].grade,pd[i].tel);

while(fscanf(f1,"\t%s\t%s\t%s\t%s\t%s\t%s ",pd[i].name,pd[i].id,pd[i].sex,pd[i].age,pd[i].grade,pd[i].tel)!=EOF){

if(strcmp(pd[i].sex,sex)==0)

{

printf("\t%s\t%s\t%s\t%s\t%s\t%s ",pd[i].name,pd[i].id,pd[i].sex,pd[i].age,pd[i].grade,pd[i].tel);

flag=1;

}

}

if(flag==0){

printf("\t*****NOT FOUND*****");

}

n++;

fclose(f1);

}

// function for display score from big to small

void mix()

{

printf("\tID\tName\tSex\tAvg ");

printf("\t-------------------------------------------------------------------- ");

for(int k=pd[k].avg ;k>=0 ;k--)

{

{

printf("\t%s\t%s\t%s\t%f " ,pd[k].id,pd[k].name,pd[k].sex,pd[k].avg);

}

}

}

void loing_password()

{

char username[15];

char password[12];

printf("Enter your username: ");

scanf("%s",&username);

printf("Enter your password: ");

scanf("%s",&password);

if(strcmp(username,"chaitu")==0){

if(strcmp(password,"123")==0){

printf(" Welcome.Login Success!");

}else{

printf(" wrong password");

}

}

else{

printf(" User doesn't exist");

}

printf(" ");

}

void mun()

{

printf("\t\t\t\t |======================================================================| ");

printf("\t\t\t\t | WELCOME | ");

printf("\t\t\t\t | To | ");

printf("\t\t\t\t | STUDENT MANAGEMENT SYSTEM | ");

printf("\t\t\t\t | | ");

printf("\t\t\t\t |======================================================================| ");

printf("\t\t\t\t-----------------------------------------------------------------------------------------------------| ");

printf("\t\t\t\t|1) add students information. | 2)search information by id. | ");

printf("\t\t\t\t|----------------------------------------------------------------------------------------------------| ");

printf("\t\t\t\t|3) display all students information. | 4) update students information. | ");

printf("\t\t\t\t| ---------------------------------------------------------------------------------------------------| ");

printf("\t\t\t\t|5) for delete students informations. | 6) search male/female students informations. | ");

printf("\t\t\t\t|----------------------------------------------------------------------------------------------------| ");

printf("\t\t\t\t|7) add score student. | 8) display student score. | ");

printf("\t\t\t\t|----------------------------------------------------------------------------------------------------| ");

printf("\t\t\t\t|9) update score students. | 10) display score from big to small. | ");

printf("\t\t\t\t|----------------------------------------------------------------------------------------------------| ");

printf(" \t\t\t\t|11) Exit the program. | | ");

printf("\t\t\t\t|----------------------------------------------------------------------------------------------------|");

}

void loading( ) {

int i,j;

printf("Loading........");

for (i=1 ; i<= 20; i++){

for(j=0; j<=100000000; j++);

printf("%c",177);

}

}

// for call function use in main()

int main() {

system("color 0");

loing_password();

// loading();

int choice;

mun();

while(1){

printf(" ");

printf(" \tEnter Your Options: "); scanf("%d",&choice);

if(choice==1){

system("cls");

mun();

addInfo();

}

else if(choice==2){

system("cls");

mun();

searchInfo();

}

else if(choice==3)

{

system("cls");

mun();

displayInfo();

}

else if (choice==4)

{

system("cls");

mun();

updateInfo();

}

else if (choice==5)

{

system("cls");

mun();

deleteInfo();

}

else if (choice==6)

{

system("cls");

mun();

searchGender();

}

else if (choice==7)

{

system("cls");

mun();

addScore();

}

else if (choice==8)

{

system("cls");

mun();

displayScore();

}

else if (choice == 9)

{

system("cls");

mun();

printf(" ");

updateScore();

}

else if(choice == 10)

{

system("cls");

mun();

mix();

}

else if (choice==11)

{

system("cls");

mun();

printf("***** exit program*******");

break ;

}

}

}