Question

// READ BEFORE YOU START:
// You are given a partially completed program that creates a list of students for a school.
// Each student has the corresponding information: name, gender, class, standard, and roll_number.
// To begin, you should trace through the given code and understand how it works.
// Please read the instructions above each required function and follow the directions carefully.
// If you modify any of the given code, the return types, or the parameters, you risk failing the automated test cases.
//
// The following will be accepted as input in the following format: "name:gender:standard:roll_number:tuition_fee"
// Example Input: "Tom:M:3rd:10:2000.10" or "Elsa:F:4th:15:2700"
// Valid name: String containing alphabetical letters beginning with a capital letter
// Valid gender: Char value 'M' or 'F'
// Valid standard: String containing alpha-numeric letters beginning with a number
// Valid roll_number: Positive integer value
// Valid tuition fee: Float containing no more than 2 decimal value, for example: 1500.45 or 2000.7 or 2700
// All inputs will be a valid length and no more than the allowed number of students will be added to the list

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

#pragma warning(disable: 4996)

typedef enum { male = 0, female } gender; // enumeration type gender

struct student {
        char name[30];
        gender genderValue;
        char standard[10];
        int roll_number;
        float tuition_fee;
};

int count = 0; // the number of students currently stored in the list (initialized at 0)

struct student list[30]; // initialize list of students

// forward declaration of functions
void flush();
void branching(char);
void registration(char);
int add(char*, char*, char*, int, float, struct student*); // 30 points
char* search(char*, int, struct student*); // 10 points
void display();
void save(char* fileName);
void load(char* fileName); // 10 points

int main()
{
        load("Sudent_List.txt"); // load list of students from file (if it exists)

        char ch = 'i';
        printf("Assignment 5: Array of Structs and Enum Types\n\n");
        printf("Student information\n\n");

        do
        {
                printf("Please enter your selection:\n");
                printf("\ta: add a new student to the list\n");
                printf("\ts: search for a student on the list\n");
                printf("\td: display list of students\n");
                printf("\tq: quit and save your list\n");
                ch = tolower(getchar());
                flush();
                branching(ch);
        } while (ch != 'q');

        save("Student_List.txt"); // save list of students to file (overwrite if it exists)
        return 0;
}

// consume leftover '\n' characters
void flush()
{
        int c;
        do c = getchar(); while (c != '\n' && c != EOF);
}

// branch to different tasks
void branching(char c)
{
        switch (c)
        {
        case 'a':
        case 's': registration(c); break;
        case 'd': display(); break;
        case 'q': break;
        default: printf("Invalid input!\n");
        }
}

// The registration function is used to determine how much information is needed and which function to send that information to.
// It uses values that are returned from some functions to produce the correct ouput.
// There is no implementation needed here, but you should study this function and know how it works.
// It is always helpful to understand how the code works before implementing new features.
// Do not change anything in this function or you risk failing the automated test cases.
void registration(char c)
{
        char input[100];

        if (c == 'a')
        {
                printf("\nPlease enter the student's information in the following format:\n");
                printf("\tname:gender:standard:roll_number:tuition_fee\n");
                
                fgets(input, sizeof(input), stdin);

                // discard '\n' chars attached to input
                input[strlen(input) - 1] = '\0';

                char* name = strtok(input, ":"); // strtok used to parse string
                char* genderValueString = strtok(NULL, ":");
                char* standard = strtok(NULL, ":");
                int roll_number = atoi(strtok(NULL, ":")); // atoi used to convert string to int
                float tuition_fee = atof(strtok(NULL, ":")); // atof used to convert string to float

                int result = add(name, genderValueString, standard, roll_number, tuition_fee, list);

                if (result == 0)
                        printf("\nThat student is already on the list\n\n");
                else
                        printf("\nStudent added to list successfully\n\n");
        }
        else // c = 's'
        {
                printf("\nPlease enter the student's information in the following format:\n");
                printf("\tname:roll_number\n");
                fgets(input, sizeof(input), stdin);

                char* name = strtok(input, ":"); // strtok used to parse string
                int roll_number = atoi(strtok(NULL, ":")); // atoi used to convert string to int

                char* result = search(name, roll_number, list);

                if (result == NULL)
                        printf("\nThat student is not on the list\n\n");
                else
                        printf("\nStandard: %s\n\n", result);
        }
}

// Q1 : add (30 points)
// This function is used to insert a new student into the list.
// Your list should be sorted alphabetically by name, so you need to search for the correct index to add into your list (array).
// If a student already exists with the same name, then those students should be sorted by roll_number.
// Do not allow for the same student to be added to the list multiple times. (same name and same roll_number (same roll number cannot happen)).
// If the student already exists on the list, return 0. If the student is added to the list, return 1.
//
// NOTE: You must convert the string "genderValueString to an enum type and store it in the list. This will be tested.
// (You must store all of the required information correctly to pass all of the test cases)
// NOTE: You should not allow for the same student to be added twice, you will lose points if you do not account for this.
// (That means that students on the list are allowed to have the same name but not same roll number).
// You are not required to use pointer operations for your list but you may do so if you'd like. 
// 'list' is passed to this function for automated testing purposes only, it is global.
int add(char* name, char* genderValueString, char* standard, int roll_number, float tuition_fee, struct student* list)
{
    return 0;
}

// Q2 : search (10 points)
// This function is used to search for a student on the list and returns the standard of that student
// You will need to compare the search keys: name and roll_number, with the stored name and roll_number.
// If the student exists in the list, return a String containing the standard of the requested student.
// If the student does not exist on the list, return NULL
char* search(char* name, int roll_number, struct student* list)
{
    return NULL;
}
// This function displays the list of students and the information for each one. It is already implemented for you.
// It may be helpful to trace through this function to help you complete other sections of this assignment.
void display()
{
        char* genderValue = "Male";
    int i;
        if (count == 0)
                printf("\nThere are no students on this list!\n\n");
        else {
                for (i = 0; i < count; i++)
                {
                        printf("\nName: %s\n", list[i].name);

                        if (list[i].genderValue == male)
                                genderValue = "Male";
                        else if (list[i].genderValue == female)
                                genderValue = "Female";

                        printf("Standard: %s\n", list[i].standard);
                        printf("Gender: %s\n", genderValue);
                        printf("Roll No: %d \n", list[i].roll_number);
                        printf("Tuition Fee: $ %.2f \n", list[i].tuition_fee);
                }
                printf("\n");
        }
}

// This function saves the array of structures to file. It is already implemented for you.
// You should understand how this code works so that you know how to use it for future assignments.
void save(char* fileName)
{
        FILE* file;
    int i;
        file = fopen(fileName, "wb");

        fwrite(&count, sizeof(count), 1, file);
        for (i = 0; i < count; i++)
        {
                fwrite(list[i].name, sizeof(list[i].name), 1, file);
                fwrite(list[i].standard, sizeof(list[i].standard), 1, file);
                fwrite(&list[i].genderValue, sizeof(list[i].genderValue), 1, file);
                fwrite(&list[i].roll_number, sizeof(list[i].roll_number), 1, file);
                fwrite(&list[i].tuition_fee, sizeof(list[i].tuition_fee), 1, file);
        }
        fclose(file);
}

// Q3:  Load file (10 points)
// This function loads data from file and build the the array of structures. 
// Use the save function given above as an example on how to write this function.
void load(char* fileName)
{


     return NULL;
}

Example outputs for the use of these functions are included below.

add: Assignment5Array of Structs and Enum Types tudent inforrmation Please enter your selection: a: add a new student to the list s: search for a student on the list d: display list of students q: quit and save your list ai Please enter the student's information in the following format: Tom:M:1st:11211:2350.75 Student added to list successfully Please enter your selection: name gender standard:roll_number tuition fee a: add a new student to the list s search for a student on the 1ist d: display list of students q: quit and save your list Please enter the student's information in the following format: Jerry:M:1st :12321:2450.55 Student added to list successfully Please enter your selection: name gender:standard roll_number:tuition_fee a: add a new student to the list s: search for a student on the list d: display list of students q: quit and save you list ai Please enter the student's information in the following format: Elsa:F:3rd:1233:3450.65 Student added to list successfully Please enter your selection: name gender standard:roll_number tuition fee a: add a new student to the list s search for a student on the 1ist d: display list of students q quit and save your list

Answer 1

Please find the code for load() , search() and add() funtions . Please add in comments if anything else needed

int add(char* name, char* genderValueString, char* standard, int roll_number, float tuition_fee, struct student* list)
{
int i = 0, ret = 0 ,j=0;
int flag = 0;

if((roll_number < 0) || !(name[0] >=65 && name[0] <=90) || !(isdigit(standard[0])) || (genderValueString[0] != 'M' && genderValueString[0] != 'F') ){
return 0;
}

if(count != 0){

while((i < count) && ((ret = strcmp(list[i].name,name)) < 0)){
i++;
}

if(ret == 0){
if(list[i].roll_number == roll_number)
return 0;
else
i++;
}

if(i != count){
for(j=i ; j < count ;j++){
list[j+1] = list[j];
}
}
}

strncpy(list[i].name,name,sizeof(list[i].name) - 1);
list[i].name[29] = '\0';
if(!strncmp(genderValueString,"F",1)){
list[i].genderValue = female;
}
else{
list[i].genderValue = male;
}
  
strncpy(list[i].standard,standard,strlen(standard));
list[i].roll_number = roll_number;
  
list[i].tuition_fee = tuition_fee ;

count++;
  
return 1;
}

char* search(char* name, int roll_number, struct student* list)
{
int i =0;

for(i=0; i < count ;i++){
if( !(strcmp(name,list[i].name)) && (list[i].roll_number == roll_number))
return list[i].standard;
}

return NULL;
}

void load(char* fileName)
{
FILE* fp = fopen(fileName,"r");
char ch = ' ';
char gen[10] = {'\0'};
char input[200] = {'\0'};
int i = 0;

if(fp == NULL){
printf("Cannot open the file\n");
return;
}

i = count;
while(ch != EOF ){
fscanf(fp,"%[^\n]",input);

if(strlen(input) == 0)
break;

strcpy(list[i].name,strtok(input,":"));
  
strncpy(gen,strtok(NULL,":"),10);
if(gen[0] == 'M')
list[i].genderValue = male;
else
list[i].genderValue = female;

strncpy(list[i].standard,strtok(NULL,":"),sizeof(list[i].standard) - 1);
  
list[i].roll_number = atoi(strtok(NULL,":"));
list[i].tuition_fee = atof(strtok(NULL,":"));
  
i++;
count++;
ch = fgetc(fp);
memset(input,0,sizeof(input));
}

}