Minor Problem with my program. Any help greatly appreciated.

agentxx04 · #1 23-Oct-2004, 18:48

Hi. I'm trying to make a program where the program asks for:
1. customer number
2. 1st letter of customer's last name
3. Amount

This is what I have so far:

CPP / C++ / C Code:

#include <stdio.h>
#include <conio.h>

int main() {

	int num;
	char lastname[1];
	float tempnum;
	float purchase[100];


		printf("Customer number:");
		scanf("%d", &num);
		printf("1st letter: ");
		getche();
		lastname[1] = getche();
		printf("\n");
		printf("Amount of purchase:");
		scanf("%f", &tempnum);
		purchase[100] = tempnum;
    printf("\n");


	return 0;

}

The only problem I have is that I want this program to keep asking the user those 3 questions until the user enters zero for the customer number. Like this:

Screen:
customer number?: 12
1st letter of customer's last name?: W
Amount?: 99.95

Customer number?:0

If anyone could give me some advice as to what I can do, I would greatly appreciate it.

Thanks!
:-D

P.S. - Does anybody know how to print out ammount in dollars and cents? ($1.50)

??:

nkhambal · #2 23-Oct-2004, 20:58

Use a do while loop whith choice >0

CPP / C++ / C Code:

do
{

3 questions code

} while (num>0);

Also if you just want to print dollar sign then use "$" sign in your printf statment.For e.g.

CPP / C++ / C Code:

printf("Amount : $%d\n",amount);

WaltP · #3 23-Oct-2004, 23:19

Quote:

Originally Posted by nkhambal

Use a do while loop whith choice >0

CPP / C++ / C Code:

do
{

3 questions code

} while (num>0);

Also if you just want to print dollar sign then use "$" sign in your printf statment.For e.g.

CPP / C++ / C Code:

printf("Amount : $%d\n",amount);

While your first suggetion works, your second is somewhat off. Isn't amount a floating point number? How does %d output a floating point value with 2 decimals?

A correct answer is %.2f for your format string. This prints the number with 2 decimals.

small_ticket · #4 24-Oct-2004, 05:21

Quote:

Originally Posted by WaltP

While your first suggetion works, your second is somewhat off. Isn't amount a floating point number? How does %d output a floating point value with 2 decimals?

A correct answer is %.2f for your format string. This prints the number with 2 decimals.

sorry...
i do not know to ask my question in here is right or not but it is related to this situation if it is wrong pls warn me!!!
in c we use %.2f but i want to implement in c++ in cout what is its format???

nkhambal · #5 24-Oct-2004, 14:46

Hi Waltp,

It was a general example and not as per the code in first post. :-)

WaltP · #6 24-Oct-2004, 15:31

Quote:

Originally Posted by nkhambal

Hi Waltp,

It was a general example and not as per the code in first post. :-)

As a seasoned programmer, I found your use of %d a confusing response for floating output since you did not mention it was "a general example" not a specific answer. I therefore guessed that if I was confused, what would a newbie think? They would use the code and wonder why it still didn't work.

I have no probelm with "general" answers (I perfer them myself) but make sure you write the response with no question that it's an idea of what to do, not an example of what will work. Avoids confusion...

nkhambal · #7 24-Oct-2004, 16:04

Aye Aye.. :-)

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