Thread: Strings and white space

Is it possible to scan strings with spaces, and then other unlike int variables. For instance, if I wanted to input the name of a tool, then it's price, how would I differentiate between the two in the scan line?

Here's a sample of code:

Code:

void newrecord(FILE *fptr)
{
	struct inventory tool = {0, "", 0, 0.0};

	int recordnum;

	printf("Enter new record (1-100): ");
	scanf("%d", &recordnum);

	fseek(fptr, (recordnum - 1) * sizeof(struct inventory), SEEK_SET);

	fread(&tool, sizeof(struct inventory), 1, fptr);

	if(tool.recordnum != 0){
		printf("Record #%d already contains information.\n", tool.recordnum);
	}
	else{
		printf("Enter Tool Name, Quantity and Cost: ");
		scanf("%s%d%lf", &tool.toolname, &tool.quantity,
			&tool.cost);
		tool.recordnum = recordnum;

		fseek(fptr, (tool.recordnum - 1) * sizeof(struct inventory), SEEK_SET);

		fwrite(&tool, sizeof(struct inventory), 1, fptr);
	}/*end else*/
}

My problem is that I can't get scanf to differentiate beween the variables for 'toolname' and 'quantity'.

I am, but the problem is with input like "Sledge Hammer" and then 7.50 for cost. I need to figure out how to enter strings that have spaces, and then input value for other variables.

Thanks for that. Why do you set name[index] to zero?

Thanks again for the help. OK, I've changed your code around a little to fit my program. This is the new function prototype to insert a new record. See below:

Code:

void newrecord(FILE *fptr)
{
	struct inventory tool = {0, "", 0, 0.0};

	int recordnum, i = 0;
	char temp[30];

	printf("Enter new record (1-100): ");
	scanf("%d", &recordnum);

	fseek(fptr, (recordnum - 1) * sizeof(struct inventory), SEEK_SET);

	fread(&tool, sizeof(struct inventory), 1, fptr);

	if(tool.recordnum != 0){
		printf("Record #%d already contains information.\n", tool.recordnum);
	}
	else{
		printf("Enter name, quantity, and cost: ");
		fgets( temp, 30, stdin );
		
		while(temp[i] != 0 && !isdigit(temp[i + 1])){
			++i;
		strncpy(tool.toolname, temp, i);
		tool.toolname[i] = 0;
		}
		sscanf( &temp[i], "%d%lf", &tool.quantity, &tool.cost);
		printf( "Name: %s\nQuantity: %d\nCost: %lf\n", tool.toolname, tool.quantity, tool.cost);

		tool.recordnum = recordnum;
	}/*end else*/
}

Below is a shot of the program when running.

Press 1 to begin a new file, 2 to use existing data: 1

Enter your choice
1 - store a formatted text file of the inventory called
"storeinv.txt" for printing
2 - update a record
3 - add a new record
4 - delete a record
5 - end program
? 3
Enter new record (1-100): 3
Enter name, quantity, and cost: Name:

Quantity: 0
Cost: 0.000000

Enter your choice
1 - store a formatted text file of the inventory called
"storeinv.txt" for printing
2 - update a record
3 - add a new record
4 - delete a record
5 - end program
?

So what happens between the time I enter a new record number and the time I'm supposed to enter data for the record?

I have also tried the following:

Code:

void eatnewline(void) {
    int x;
    
    do {
        x = getchar();
    } while(x != '\n' && x != EOF);
}

Code:

void newrecord(FILE *fptr)
{
	struct inventory tool = {0, "", 0, 0.0};

	int recordnum, tmprcd, i = 0;
	char temp[30];

	printf("Enter new record (1-100): ");
	scanf("%d", &recordnum);
	tmprcd = recordnum;

	fseek(fptr, (recordnum - 1) * sizeof(struct inventory), SEEK_SET);

	fread(&tool, sizeof(struct inventory), 1, fptr);

	if(tool.recordnum != 0){
		printf("Record #%d already contains information.\n", tool.recordnum);
	}
	else{
		printf("Enter name, quantity, and cost: ");
		eatnewline();
		fgets( temp, 30, stdin );
		
		while(temp[i] != 0 && !isdigit(temp[i + 1])){
			++i;
		strncpy(tool.toolname, temp, i);
		tool.toolname[i] = 0;
		}
		sscanf( &temp[i], "%d%lf", &tool.quantity, &tool.cost);
		printf( "Name: %s\nQuantity: %d\nCost: %lf\n", tool.toolname, tool.quantity, tool.cost);

		tool.recordnum = tmprcd;
	}/*end else*/
}

which is supposed to take care of the newline character. Only this happens when I run the program. I can't figure it out.

Press 1 to begin a new file, 2 to use existing data: 1

Enter your choice
1 - store a formatted text file of the inventory called
"storeinv.txt" for printing
2 - update a record
3 - add a new record
4 - delete a record
5 - end program
? 3
Enter new record (1-100): 3
Enter name, quantity, and cost: Electric sander 7 57.98
Name: Electric sander
Quantity: 7
Cost: 57.980000

Enter your choice
1 - store a formatted text file of the inventory called
"storeinv.txt" for printing
2 - update a record
3 - add a new record
4 - delete a record
5 - end program
? 2
Enter record to update(1-100): 3
Record has no information.

Enter your choice
1 - store a formatted text file of the inventory called
"storeinv.txt" for printing
2 - update a record
3 - add a new record
4 - delete a record
5 - end program
?

Sorry, I forgot the code to write the new data into the file. It works now.