Controlling Repetition in a Structure

Hey all, having a bit of a problem with controlling the repetition of input into a structure.
It seems that if i use a while loop with an integer as its condition then it will work fine, but if i want the while condition to be with a string, or char, then it seems to stay in the loop and i can't get out.
Anyway i've posted the code, so if anyone can help me it would be great.

Code:

#include <stdio.h>

#define MAX_STUDENT 10 /* size of structure array */


typedef struct { 
	int studentNum;
	char lastName[ 15 ];
	char firstName[ 10 ];
	double balance;
} studentData;


void read_studentRecord( studentData [] );
void print_studentRecord( studentData []);

int main()
{ 
	studentData student[MAX_STUDENT]; /* define a structure array of size MAX_CLIENT */

	read_studentRecord( student );
	print_studentRecord( student );
	return 0;

}


/* Read client records and store them in a structure */ 

void read_studentRecord( studentData student[] )
{
	int i = 0;

	printf( "Enter student number( E.g S00023456, (0 to end input) )\n? " );
	scanf( "%d", &student[i].studentNum );
	while ( student[i].studentNum != 0 ) 
	{ 

		printf( "Enter lastname, firstname, Phone #\n? " );
		scanf( "%s%s%lf",student[i].lastName, student[i].firstName, 
		&student[i].balance );
		i++;
	
		printf( "Enter account number\n? " );
		scanf( "%d", &student[i].studentNum );
	}

}


/* Print client records stored in the structure */

void print_studentRecord( studentData student[] )

{
	int i = 0;

	if (student[0].studentNum != 0)

	printf( "\n%-6s%-16s%-11s%10s\n\n", "Acct", "Last Name", 
	"First Name", "Balance" );

		while ( student[i].studentNum != 0 ) 
	{ 

	printf( "%-6d%-16s%-11s%10.2f\n", student[i].studentNum, 
	student[i].lastName, student[i].firstName, student[i].balance );

	i++;

	}

}

Thanks again

Sorry about double posting, but

atm in the read_studentRecord function, the while loop works
(because studentNum is of type int)

but if i change the studentNum member to a char and change %d's to %s's it wont work for me

it may have something to do with the while condition waiting for a '0', oh well, you guys see what i cant so...

I hope i've explained that properly.

Thanks

Originally posted by Silence
Sorry about double posting, but

atm in the read_studentRecord function, the while loop works
(because studentNum is of type int)

but if i change the studentNum member to a char and change %d's to %s's it wont work for me

it may have something to do with the while condition waiting for a '0', oh well, you guys see what i cant so...

I hope i've explained that properly.

Thanks

If you are using a char then it should be %c not %s. %s is for a string.

- Sean