# Software

## Question

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### C Program Homework Help

By ·
I've been working on this question for the past few hours and can't figure it out for the life of me. PLEASE HELP!

A mail order house sells 5 different products whose retail prices are shown in the following table.
1 \$2.98
2 \$4.50
3 \$9.98
4 \$4.49
5 \$6.87
write a program that reads a series of pairs of numbers as follows:
a) product number
b) quantity sold
your program should use a switch statement to help determine the retail price for each product. Your program should calculate and display the total retail value of all products sold.

MY CODE:
#include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <math.h>

using namespace std;

int main(void)
{
int product;
int quantity;
float s1, s2, s3, s4, s5;
float p1 = 2.98;
float p2 = 4.50;
float p3 = 9.98;
float p4 = 4.49;
float p5 = 6.87;
float total;

printf ("Enter Product Number and Quantity Sold\n(Enter EOF to end)\n");
scanf ("%d%d", &product, &quantity);

while (( product = getchar ()) != EOF ){
switch (product){
case 1:
s1 = (float) quantity*p1;
break;

case 2:
s2 = (float) quantity*p2;
break;

case 3:
s3 = (float) quantity*p3;
break;

case 4:
s4 = (float) quantity*p4;
break;

case 5:
s5 = (float) quantity*p5;
break;

default:
printf ("Invalid Input\n");
break;
/*With this in my program I get Invalid Input running accross the screen*/

}
}
total = (float) s1 + s2 + s3 + s4 + s5;
printf ("Total Sales: %.2f\n", total);

system("PAUSE");
return EXIT_SUCCESS;
}

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### Try

by In reply to C Program Homework Help

scanf ("%d,%d", &product, &quantity);

http://irc.essex.ac.uk/www.iota-six.co.uk/c/c2_printf_and_scanf.asp

NB
just adding a tempiray printf statement straight after the scanf would have told you sumfing was up.

It's messy, but when what you think should be happening isn't, check what is...

Happy coding

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### Programming

by In reply to C Program Homework Help

Try taking the floated numbers that are defined out and make them case specific inside the while.

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

int main(void)
{
int product; /* initializes product */
int quantity; /* initializes quantity */
float total; /* initializes number with decimals */
total = 0.00; /* sets the total to 0 */

printf( "Enter prodcut number 1-5 or -1 to end.\n");
scanf( "%d", &product); /* prompts user for product number and puts program into a while loop */
while (product != -1) {

switch (product){

case 1: printf( "Enter quantity of product 1.\n");
scanf( "%d", &quantity); /* each individual case takes the quantity and of certain product and finds the product of quantity and the amoiunt of the product */
total = (float) total + ( 2.98 * quantity );
printf( "Total retail value is \$%.2f.\n", total); /* prints the total and prompts for a different product number and restarts the whole thing */
break;

case 2: printf( "Enter quantity of product 2.\n");
scanf( "%d", &quantity);
total = (float) total + ( 4.50 * quantity );
printf( "Total retail value is \$%.2f.\n", total);
break;

case 3: printf( "Enter quantity of product 3.\n");
scanf( "%d", &quantity);
total =(float) total + ( 9.98 * quantity );
printf( "Total retail value is \$%.2f.\n", total);
break;

case 4: printf( "Enter quantity of product 4.\n");
scanf( "%d", &quantity);
total =(float) total + ( 4.49 * quantity );
printf( "Total retail value is \$%.2f.\n", total);
break;

case 5: printf( "Enter quantity of product 5.\n");
scanf( "%d", &quantity);
total =(float) total + ( 6.87 * quantity );
printf( "Total retail value is \$%.2f.\n", total);
break;

default: system ("cls");
printf( "Sorry, invalid product number entered.\n");
}
printf( "Enter product number (1-5) or -1 to exit.\n");
scanf( "%d", &product);
}

if (product == -1) { /* ends the prompt for asking for products and ends with the toal sales of the week */

printf("The total sales for the past week are \$%.2f\n", total);
getch ();
}

return 0;
} /* end program */

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It's nice that you want to help, but I hope they got it by now considering the post is two years old.

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