array help

[gunnerz]

void addNewEnrolment() {

printf("\n       Student Number: ");
	scanf("%s", NEW_ENR_STUDENT_NUMBER);
	strcpy(edatabase[enrolment_record_count].ENR_STUDENT_NUMBER, NEW_ENR_STUDENT_NUMBER);
	edatabase[enrolment_record_count].ENR_STUDENT_NUMBER[9] = '\0';
}

void addToEnrolmentDatabaseArray(char line[]){

strncpy(edatabase[enrolment_record_count].ENR_STUDENT_NUMBER, data_pointer, 9);
	edatabase[enrolment_record_count].ENR_STUDENT_NUMBER[9] = '\0';

}

This is a part of my C program, there is a function to add new enrolment, and another funtion to add record to the array. The variable is declared like this:

char ENR_STUDENT_NUMBER[10];

The problem I am having is that, when the user input number, let say: 120 , it is less than the array size, when i call functions to modify or delete the record using ENR_STUDENT_NUMBER, it says Record not Found, but the record is succesfully added in a text file. Another problem is that, with the same workings like above but different variable:

char ENR_COURSE_DESCRIPTION[26];

When the program asks for user input, whenever the user enter space between input, the program skips 2 other inputs and goes for the next. Can anyone help me solve this problem?

[KONI]

The problem is that you're reading a number as a string and that the "number" 120 is in fact not a number but the concatenation of characters '1', '2' and '0'. Worse, the ascii value for '1' is far off from being 1, so any operation treating it as a number won't work.

I suggest you read the following FAQ entry about how to get a number from a user. It explains in every detail what the most safe way of reading a number is and gives a good example.

A shorter but less good way of doing it would be to use scanf to read a number:

int i;
scanf("%d", &i);

but then you're at the mercy of the user input.

Another way would be to convert the characters into numbers, which takes quite some practice:

int number = 0;
char string[512];
int i;

scanf("%s", string);
for (i = 0; i < strlen(string); i++, number *= 10)
{
    number += (string[i] - '0');
}

I also recommend reading how to get a string instead of using scanf().

[brewbuck]

for (i = 0; i < strlen(string) - 1; i++, number *= 10)
{
    number += (string[i] - '0');
}

This loop doesn't process the last character of the string.

[KONI]

This loop doesn't process the last character of the string.

fixed, thanks a lot

[gunnerz]

If i use fgets for user input, how i can store the input in a variable, i need to put this record in an structure array database. I am maintaining this program, can you help explain in detail the add to database and enrollment part, i am not 100% understand on that part, alright.

//read file
char line[80];

while(fgets(line, 80, infile) != NULL) {
			addToEnrolmentDatabaseArray(line);
			enrolment_record_count = enrolment_record_count + 1;

//add to database
void addToEnrolmentDatabaseArray(char line[]) {
	extern EnrolmentDatabase edatabase;
	extern int enrolment_record_count;

	char *data_pointer = line;

strncpy(edatabase[enrolment_record_count].ENR_COURSE_DESCRIPTION, data_pointer, 25);
	edatabase[enrolment_record_count].ENR_COURSE_DESCRIPTION[25] = '\0';
	data_pointer += 25;

//addEnrolment
printf("   Course Description: ");
	scanf("%s", NEW_ENR_COURSE_DESCRIPTION);
	strcpy(edatabase[enrolment_record_count].ENR_COURSE_DESCRIPTION, NEW_ENR_COURSE_DESCRIPTION);
	edatabase[enrolment_record_count].ENR_COURSE_DESCRIPTION[25] = '\0';

[Adak]

When the program asks for user input, whenever the user enter space between input, the program skips 2 other inputs and goes for the next. Can anyone help me solve this problem?

If you study KONI's link to the FAQS, you can fix that user input problem. Never underestimate the power of a user to muck up input --> they're geniuses at it.

Adak