Printline problem

[Doink]

I have written a complete coding for a program. The thing is when I run the program there is no line or whatsoever including the "bell" sound. Any idea why?

(I'm using Dev C++)

/*Updating a Series of Customer Accounts(simplified billing system)*/

#include <stdio.h>

void readinput(int i);
void writeoutput(int i);

struct date{
	int month;
	int day;
	int year;
}date;


struct account
{
	char name[40];
	char street[40];
	char city[40];
	int acct_no;
    float previous_balance;
	float current_payment;
	float new_balance;
    struct date lastpayment;	
}
customer[]={1};

void printline()
{
	int i;

	for(i=0;i>20;i++)

	{
		printf("\7");
		printf("\b");
		printf("\32");
		printf(" ");
		printf("\13");
		printf(" ");
	}
	printf("\n");

}

main()

{
	int i,n;

    printline();
    
	printf("CUSTOMER BILLING SYSTEM\n\n");
	
	printline();

	printf("\nHow many customer are there?");
	scanf("%d",&n);

	for(i=0;i<n;++i)


	{
		readinput(i);

		customer[i].new_balance = customer[i].previous_balance - customer[i].current_payment;
	}
	
	
    for(i=0;i<n;++i)
   
	writeoutput(i);
 
}

void readinput(int i)

{

	printf("Customer no.%d\n",i+1);
	
	printf("\t\Name:");
    scanf("%s",&customer[i].name);

	printf("\tStreet:");
    scanf("%s",&customer[i].street);

	printf("\tCity:");
    scanf("%s",&customer[i].city);

	printf("\tAccount number:");
	scanf("%d",&customer[i].acct_no);

	printf("\tPrevous Balance:");
	scanf("%f",&customer[i].previous_balance);

	printf("\tCurrent payment:");
	scanf("%f",&customer[i].current_payment);

	printf("\tPayment date (mm/dd/yyyy):");
	scanf("%d%d%d",&customer[i].lastpayment.month,
		           &customer[i].lastpayment.day,
				   &customer[i].lastpayment.year);
				   
    printline();
	return;

}		

void writeoutput(int i)

{
	printf("\\tnName:%s",customer[i].name);

	printf("\n\tAccount number:%d\n",customer[i].acct_no);

	printf("\n\tStreet:%s\n",customer[i].street);

	printf("\n\tCity:%s\n\n",customer[i].city);

	printf("Previous Balance: %.2f",customer[i].previous_balance);

	printf("   Current Payment: %.2f", customer[i].current_payment);

	printf("   New balance: %.2f\n\n",customer[i].new_balance);

    return;
	
}

[Salem]

> printf("\7");
It might sound the bell, but it's implementation-specific as to whether you will hear anything.

> printf("\b");
It's \a for the bell, \b is backspace.

All of which is moot anyway, because
for(i=0;i>20;i++)
the for loop is trivially false since i doesn't start off being GREATER than 20.

customer[]={1};

This doesn't declare a variable length array you can write 'n' customers into later on.

[Doink]

wow thanks, it's working now. But when i execute the symbols tend to load very slow. Is there any way to make them load faster?

[matsp]

Yes, each "beep" will take a few hundred milliseconds or so, so 20 times that will be a few seconds.

--
Mats

[Salem]

I guess you're about to learn that "beep" as an amusement lasts about 5 minutes before it becomes really annoying and then you only beep when you've got something really important to tell the user.

Even then, many advanced users would want an option to permanently turn it off.