CS1101C Lab 1 (Odd Week)

Credit Card Points

The deadline for this lab question is Friday 09 February 2007, 23:59:59 hours.

The name of your C program file must be called points1.c, files with any other name will not be marked.

Preliminary

Credit card companies award points for money spent using their cards. These points can then be converted to miles which can be used to redeem free plane tickets on certain airlines.

Earning Points

A particular credit card awards you five points for every block of eight Singapore dollars (SGD) spent. No points are given for partial blocks. So, if you spend SGD 16, you will get ten points. If you spend SGD 23, you will still get ten points.

Earning Miles

Furthermore, every block of eight points is worth five miles. Once again, no miles are awarded for partial blocks. So, if you have 40 points, you will get 25 miles. If you have 45 points, you will still get 25 miles.

Double Rewards

By default, the credit card company always gives you double the amount of points, called double rewards. So, if you spend SGD 16, instead of getting ten points, you will get 20 points.

Platinum Rewards

But there are certain shops (called platinum shops) which have a special arrangement with the credit card company. If you spend money at these platinum shops, you will get platinum rewards, and instead of getting double points, you will get 10 times the normal amount of points. So, if you spend SGD 16 at a platinum shop, instead of getting ten points, you will get 100 points.

Your Task

Write a program called points1.c that prompts the user for the amount of money spent, as well as the type of spending (ask the user to key in 1 for double spending, 2 for platinum spending). Your program will compute and display the number of miles earned.

Template

The following points1.c program has been provided for you that reads in the two inputs. You must follow the template given below. Your task is to simply extend the program to compute and print out the number of miles earned.

/**********************************************************************/
/* Matric Number: U061234A and U069876B                               */
/* Userid: u0601234 and u0609876                                      */
/* (For those doing pair programming, only ONE of you should submit   */
/*  your program. The other student should NOT submit.)               */
/* Lab: 1                                                             */
/* Lab Group Number: 99                                               */
/* Lab TA's Name: Who needs a lab TA when you're Bill Gates?          */
/* Lab Session Date: 07 February 2007                                 */
/* Lab Session Time: 1000 - 1145                                      */
/* Title: Points to Miles conversion.                                 */
/* Purpose: Perform Points to Miles conversion.                       */
/**********************************************************************/

#include <stdio.h>

int main(void)
{
    /* Variable declaration.
       You can declare any other variables here. */
    int spending, type;

    /* Get user input. */
    printf("Enter amount of spending in SGD: ");
    scanf("%i", &spending);
    printf("Enter type of rewards (1=double, 2=platinum): ");
    scanf("%i", &type);

    /* Compute and print result here. */

    return 0;
}

Sample Runs

Assuming that the executable is points1, a sample run of the program is shown below. User input is denoted in bold.


$ gcc -Wall points1.c -o points1
$ ./points1
Enter amount of spending in SGD: 123
Enter type of rewards (1=double, 2=platinum): 1
Your spending is: SGD 123
Type of rewards: 1
Number of points earned: 150
Number of miles earned: 90

$ ./points1
Enter amount of spending in SGD: 123
Enter type of rewards (1=double, 2=platinum): 2
Your spending is: SGD 123
Type of rewards: 2
Number of points earned: 750
Number of miles earned: 465

$

Points to Note

For simplicity, we assume that user input will always be within the range of permissible values, so there is no need to perform any explicit checks on the data entered by the user. You may assume that the amount of spending is always an integer between SGD 0 to SGD 1,000,000,000 inclusive.
Do not use any other data types except int. That means you are not allowed to use double, float, char, etc. You are only allowed to use the int data type and nothing else.
The only conversion specifier allowed within printf statements is strictly %i (or %d).
Do not use any logical (&&, ||, !) or bit-wise (&, |, ^, !, <<, >>) operators.
Do not use any selection statements (if, if-else, switch), repetition statements (while, do-while, for), nor the conditional operator "?:".
Do not use any functions from the math library.

Ponder

70,000 miles is enough for you to redeem a round-trip Economy Saver class ticket to Paris, the City of Lights. How much spending is required to earn 70,000 miles, with (a) double rewards, and with (b) platinum rewards?

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