Thread: how to delete data

hehe.. I edited it.. because it's my assignment... xD

What i do is put a few end of string char's into the char array on the low end (0,1,2). Only array[0] should be needed, but I like to to sure.

End of string char is '\0'.

Originally Posted by Kinshara

Code:

for(int c=0;c<jum_data;c++)// so I am searching the "nim" which must be same with the files
	{
	if(strcmp(nim,data_mahasiswa[c].nim)==0)        //this is OK :)
	{printf("NIM : %s\n",data_mahasiswa[c].nim);
	printf("Nama : %s\n",data_mahasiswa[c].nama);
	printf("Are you sure want to delete??(y/n)");
	tombol=getchar();
	if(tombol=='y')                                       //this is OK
	{
	data_mahasiswa[c].nim[0]=='\0';              //This is wrong, just one =
	data_mahasiswa[c].nim[1]=='\0';              // this is wrong, just one =
	data_mahasiswa[c].nim[2]=='\0';              //this is worng, just one =
	}

can I use that?
I declare "nim" as char..
but I won't work.. am I wrong?

Not == (compared to), but = (assignment). Remove one = .


Also, inside your curly braces, please indent your code 2 or three spaces:

not:

Code:

{printf...
printf...
printf
}

but:

Code:

{  
   printf
   printf...
   printf...
}

WAW!! you are right!!! hahaha..
it works!
but, how about int type?
can we just use same? "\0"???

can we delete it directly to their struct?

Code:

struct profile
{
  char a[11];
  char b[12];
  int c;
};
struct profile work_profile[10];
/* can we delete at once by deleting work_profile[3]? */

Originally Posted by Kinshara

WAW!! you are right!!! hahaha..
it works!

You don't have to act **SO** damn surprised! <LOL>

but, how about int type?
can we just use same? "\0"???


No. '\0' is for char's. For int's, set them to zero.

"Can we delete it directly to their struct?"

You can delete a struct, but you don't want to, usually. You want to set the members of the struct, to their proper value, and then print up only the one's that have the values you are looking for.


For instance, say "Ishmael" leaves the class, and you need to remove his record from your class program.

You don't delete his struct. You recycle it.

You set his name to '\0\0\0" and or set his school ID number, to 0. Now your program logic knows that the record struct for Ishmael, is unused, and can be given data for another student - and no struct was deleted, or needs to be created.

You could print out your records using logic like this:

Code:

for(i = 0; i < NumberOfRecords; i++) {
  if(records[i].studentNum)
    printf("\n %d %s ", records[i].studentNum, records[i].name);
}

A database will keep several records like this, available for reuse. It saves a lot of computer time.