Thread: Updating Records

Is it possible you could edit this function to update this particular record.

Record

Code:

struct Student
{
  int ID;
  char LastName[32]; 
  char FirstName[32];
  int DateOfBirth; 
  char Address[32];
  char TelephoneNumber[11]; 
  char ProgramPursued[32];   
};

struct Student students[10]={
{123,"Hall", "Rayon", 160687, "43_Olympic_ Court", "898-0497", "Computer"},
{234,"Spencer", "Sochelle", 220587, "29_Decent_Village", "528-5214", "Business"},         
{345,"Dobson", "Dwayne", 890583, "263_Far Park Blvd", "457-2014", "Computer"},
{456,"Clarke", "Dave", 110181, "87_Rasta_Village", "354-5874", "Law"},
{567,"Currie", "Nickeisha", 230491, "26_Waterground_rd", "898-6578", "Nurse"},
{678,"Blackwood", "Mariann", 10490, "3_St_Johns_road", "256-1458", "Art"},
{789,"Hall", "Wesley", 101086, "3_Bayfarm_road", "236-1028", "Science"},
{891,"Hall", "Bouki", 251285, "67_pimpim_drive", "887-9910", "Engineer"},
{912,"Paul", "Shawn", 231180, "25_glasco_Close", "567-1996", "Law"},
{101,"Able", "Frank", 100591, "1_Camp_road", "528-1235", "Business"},
};

Update Students

Code:

void UpdateStudents(Student students[])
{
     char name[10];
     int position;
     int change;
     
  printf("Enter the First name of the person record you want to edit: ");
  scanf("%d", &name);
    for (int i=0;i<10;i++)
    {
        if (name==students[i].FirstName)
{
                printf("Enter Index position of desired changes[0-6]:");
                fflush(stdin);
                scanf("%d", &position);
                
                printf("What do you want to change it to:");
                fflush(stdin);
                scanf("%d", &change);
                
                Student students[position]=change;
                }
                }
                

}

1) String comparison is done via strcmp(string1,string2) not ==.

2) Don't fflush(stdin) EVER! Whoever taught you that has no idea what he is doing.

3) Ident your code properly.

4)Student students[position]=change; <----- Does not make any sense student = int???

could u show me how to allow the user to update the record. i.e if the user want to change something from the record he will be able to then append the new entry with the what the user edit

If by position you mean the actual member of the struct (whether it's name, ID or whatever) then you are on the right track.

1st: Make the changes I suggested above.

2nd: Not sure what "int change" is in your logic.

3rd: You will need to make a switch statement to switch around your position and consider what field needs editing in each of its cases.

its kinda complicated. could u give me an example

3rd: You will need to make a switch statement to switch around your position and consider what field needs editing in each of its cases.


This is what i dont understand. And im not asking u to do my work, i am a young student in C Programming and i just saw a practise question and attempt it. So your hep is very much appreciated.

Code:

void UpdateStudents(Student students[])
{
   int choice;
printf("What do you want to change?\n");
printf("1. Change ID number\n 2. Change Last Name\n 3. Change First Name\n 4. Change Date of Birth\n 5. Change Address\n 6. Change Telephone number\n 7. Change Program\n");
scanf("%d", &choice);
switch (choice) {
    case 1:
        printf("Input new ID number: ");
        scanf("%d", &students[i].ID);
        break;
        
     case 2:
        printf("Input new Last Name: ");
        scanf("%d", &students[i].LastName);
        break;
        
     case 3:
        printf("Input new First Name: ");
        scanf("%d", &students[i].FirstName);
        break;
        
     case 4:
        printf("Input new Date of Birth: ");
        scanf("%d", &students[i].DateOfBirth);
        break;
        
      case 5:
        printf("Input new Address: ");
        scanf("%d", &students[i].Address);
        break; 
        
       case 6:
        printf("Input new Telephone Number: ");
        scanf("%d", &students[i].TelephoneNumber);
        break;  
              
       case 7:
        printf("Input new Program: ");
        scanf("%d", &students[i].ProgramPursued);
        break;  
                    
    default:
        printf("Bad input\n");
        break;
}  

}

And what do you believe i to be in this function?

Ok. Your framework should be something like this(from my understanding of what you want to do):

Code:

/* somewhere at the beginning of the function */
int change_int;
char change_str[32];

/* .............. now inside your if */
if (strcmp(name,students[i].FirstName) == 0)
{
                printf("Enter Index position of desired changes[0-6]:");
                scanf("%d", &position);
                
                printf("What do you want to change it to:");

                switch(position)
                {
                   /* case 0 means the user wants to modify student.id, so read an int value */
                   case 0: scanf("%d",change_int);
                                student[i].id = change_int;
                                break;
                   /* case 1 means the user wants to modify student.lastname so read a string */
                   case 1: scanf("%s",change_str);
                                strcpy(student.lastname,change_str);
                                break;
                    /* so on and so forth for all of the fields */

                    default: break;
                }           
               
}

Ok, not bad nuddy, yours is actually better because you are not overcomplicating it with additional temporary storage variables.

However make sure that this is inside your for, otherwise you are not modifying the position that holds the name that you want.

could u put mines in the for loop just to give me an example of what it will do

How can i write what the user change back to the file "record.txt"

Code:

void UpdateStudents(Student students[])
{
   int choice;
for (int i=0;i<10;i++)
    {

printf("What do you want to change?\n");
printf("1. Change ID number\n 2. Change Last Name\n 3. Change First Name\n 4. Change Date of Birth\n 5. Change Address\n 6. Change Telephone number\n 7. Change Program\n");
scanf("%d", &choice);
switch (choice) {
    case 1:
        printf("Input new ID number: ");
        scanf("%d", &students[i].ID);
        break;
        
     case 2:
        printf("Input new Last Name: ");
        scanf("%d", &students[i].LastName);
        break;
        
     case 3:
        printf("Input new First Name: ");
        scanf("%d", &students[i].FirstName);
        break;
        
     case 4:
        printf("Input new Date of Birth: ");
        scanf("%d", &students[i].DateOfBirth);
        break;
        
      case 5:
        printf("Input new Address: ");
        scanf("%d", &students[i].Address);
        break; 
        
       case 6:
        printf("Input new Telephone Number: ");
        scanf("%d", &students[i].TelephoneNumber);
        break;  
              
       case 7:
        printf("Input new Program: ");
        scanf("%d", &students[i].ProgramPursued);
        break;  
                    
    default:
        printf("Bad input\n");
        break;
}  

} }