Thread: Records and Files

This topic is really new to me, i was just reading some stuff ahead of my class and saw a practisable question, I have started it but now im really confuse. I would appreciate it if someone cold modify it so i could gain more practise.
QUESTION
You are required to create a student management system that will allow you to store and
update student records. Each student record should consist of an id, a name (fist name
and last name), date of birth, address, telephone number and the program being pursued.
Assume 10 records will be stored.
1. Create and populate an array of records. Store records into file
2. Allow user to update a record. Note, the user should only manipulate the data
structure. All changes to the data structure should then be use to overwrite the
file.
3. Allow user to search for a record from the data structure.
4. Print all records from the structure.
NB. You should create appropriate functions to solve the problem.

Code:

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

struct student
{
  char* ID[10];
  char* LastName[10]; 
  char* FirstName[10]; 
  char* DateOfBirth[10];  
  char* Address[10];
  char* TelephoneNumber[10]; 
  char* ProgramPursued[10];   
};

struct student students[10]={
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
{"a243","Spencer", "Sochelle", "22-05-87", "43_Olympic_Court", "898-0497", "Computer"},         
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
{"a123","Hall", "Rayon", "16-06-87", "43_Olympic_Court", "898-0497", "Computer"},
};


char GetUserOption()
{
  char option = 'I'; // 'I' for Invalid

  while(option == 'I')
  {

    printf("\n");
    printf("Choose one of the following options:\n\t\t\t[u]pdate   [P]rint   [S]earch   [E]xit\n");
    scanf("%c", &option);

    switch(toupper(option))
    {
      case 'U':
      case 'P':
      case 'S':
      case 'E':
        break;
      default:
        option = 'I';
        break;
    }
  }

  return option;
}

void LetUserSearchForStudent()
{

  int count;
  char id,f;
 
  

  printf("Enter the id you want to search for\n");
  scanf("%c", & id);
  f='b';
  for(count=0; count<10; count++)
  {
	if(id== student students[count])
	{
		print("%c was found at location %d", id, count);
		count=10;
		f='a'
	}
  }
  if (f=='b')
	printf("%c was not found", id);
}

void PrintStudents(Student students[])
{
  fprintf(fp, "%student", students[]);
}


void LoadStudents(Student students[])
{
  FILE *fp=fopen("records.txt","r");
}

void UpdateStudents(Student students[])
{
  FILE *fp=fopen("records.txt","a");
}
  
void SaveStudents(Student students[])
{
  int i;

  // Open the file for writing
  FILE *fp = fopen("records.txt", "wb");
  if(fp == NULL) return; 

  // Loop through each student
  for(i = 0; i < 10; ++i)
  {
    // Write the student to the file....
    fprintf(fp, "%s,%s,%s,%s,%s,%s,%s\r\n", 
            students[i].ID,
            students[i].LastName,
            students[i].FirstName,
            students[i].DateOfBirth,
            students[i].Address,
            students[i].TelephoneNumber,
            students[i].ProgramPursued
    );    
  }

  // Close the file
  fclose(fp);  
}

}


int main()
{
  Student students[10];
  int looping = 1;

  // Load the students from the file
  LoadStudents(students);

  // Loop until exit
  while(looping)
  {
    char option = GetUserOption();
    switch(option)
    {
      case 'U':
        UpdateStudents(Student students[]);
        break;

      case 'P':
        PrintStudents(Student sudents[]);
        break;

      case 'S':
    LetUserSearchForStudent()
       
             break;

      case 'E':
        looping = 0; // exit the loop
        break;
    }
  } 

  // Save the students to the file
  SaveStudents(students);

  return 0;
}

What are you confused about?

The program not compiling. I think something is wrong the functions

What are the compiler errors?

its alot, could u copy the code and modify it for me plz

Ummm NO! You copy the compiler errors and post them here and I will help you fix it. Nobody here is going to do the work for you though buddy.

Also, compiler errors are usually VERY Explicit in what you need to look for. They even indicate the line you should look at.

Code:

 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp In function `void LetUserSearchForStudent()': 
69 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp expected primary-expression before "students" 
69 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp expected `)' before "students" 
71 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp `print' undeclared (first use this function) 
  (Each undeclared identifier is reported only once for each function it appears in.) 
74 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp expected `;' before '}' token 
74 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp At global scope: 
80 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp variable or field `PrintStudents' declared void 
80 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp `Student' was not declared in this scope 
81 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp expected `,' or `;' before '{' token 
86 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp variable or field `LoadStudents' declared void 
86 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp `Student' was not declared in this scope 
87 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp expected `,' or `;' before '{' token 
91 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp variable or field `UpdateStudents' declared void 
91 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp `Student' was not declared in this scope 
92 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp expected `,' or `;' before '{' token 
96 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp variable or field `SaveStudents' declared void 
96 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp `Student' was not declared in this scope 
97 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp expected `,' or `;' before '{' token 
123 C:\Documents and Settings\Nuddy\Desktop\coursework2.cpp expected declaration before '}' token

Ok first problem, since you are not typedef-ing the struct you need to use "struct Student" everywhere you use Student.

So just add the word struct before any use of Student. Let me know what the compiler errors are after that.

example: struct Student students[10];

how would u typedef this...caz i doing that topic and im not getting it

One way to do it:

Code:

typedef struct student
{
  char* ID[10];
  char* LastName[10]; 
  char* FirstName[10]; 
  char* DateOfBirth[10];  
  char* Address[10];
  char* TelephoneNumber[10]; 
  char* ProgramPursued[10];   
}STUDENT;

Then just use:

STUDENT mystudent;

so both the struct and the typedef can work with each other...........

Typedef can work with anything. Typedef just redefines how you name a particular existing type.

In the example above you create struct student define it on the spot and rename it to STUDENT.

But you can also redefine other things, even primitive types:

typedef int INTEGER;

And then do:
INTEGER x = 10;

oooo...'.ok wow.....nice, i see what ur saying now