[C]数学计算问题

#include <stdio.h>
#include <time.h>
#include <conio.h>
#include <math.h>
void main()
{
int lock, tbnum, pzchoice, pzquantity, drkchoice, drkquantity;
char getmember, memberstat, membertype_get, membertype, pzsize_get, pzsize, pizza[12], drink[22],dispdiscount[5], memberdesc[22], custname[175]; // custname array based on World's Longest Name of a Person which has 174 characters
float pzprice, drkprice, calcdiscount, pzsubtotal, drksubtotal, totalchrg, amountdc, discounted, tax, total, round, rounded, totalpay, paid, change;
struct tm * timeinfo;
time_t lt;
puts("=====================================\n");
puts("- WELCOME TO PIZZA HOUSE RESTAURANT -\n");
puts("=====================================\n");
puts("\n- MEMBERSHIP TYPES\n");
puts(" G - Gold Class Member\n P - Platinum Class Member\n");
puts("\n- PIZZA SIZES\n");
puts(" L - Large (12\")\n R - Regular (9\")\n P - Personal (6\")\n");
puts("\n- PIZZA FAVOURITES\n");
puts(" 1. Pepperoni\n 2. Seafood\n 3. Vegetable\n 4. Hawaiian\n 5. Mixed Combo\n");
puts("\n- DRINKS\n");
puts(" 1. Orange Juice\n 2. Coffee\n 3. Mineral Water (600ml)\n 4. Pepsi\n");
// Prompt customer's individual & order informations.
printf("\nPlease enter your name\t: ");
gets(custname);
fflush(stdin);
printf("Are you a member? (Y/N)\t: ");
// Limits user input to Y and N only.
lock = 0;
do {
getmember = getch();
switch(getmember) {
case 'Y':
case 'y':
if (lock == 0) {
printf("Y");
lock = 1;
}
else {
printf("\bY");
}
memberstat = 'Y';
break;
case 'N':
case 'n':
if (lock == 0) {
printf("N");
lock = 1;
}
else {
printf("\bN");
}
memberstat = 'N';
break;
case '\r':
if (memberstat == 'Y' || memberstat == 'N'); {
printf("\n");
}
break;
default:
if (lock != 1) {
printf("\b%c", memberstat);
lock = 0;
}
else {
lock = 1;
}
break;
}
fflush(stdin);
}
while (getmember != '\r' || (memberstat != 'Y' && memberstat != 'N'));
// Prompt member type decision...
if (memberstat == 'Y') {
printf("Membership Type? (G/P)\t: ");
// Limits user input to G and P only.
lock = 0;
do {
membertype_get = getch();
switch(membertype_get) {
case 'G':
case 'g':
if (lock == 0) {
printf("G");
lock = 1;
}
else {
printf("\bG");
}
membertype = 'G';
break;
case 'P':
case 'p':
if (lock == 0) {
printf("P");
lock = 1;
}
else {
printf("\bP");
}
membertype = 'P';
break;
case '\r':
if (membertype == 'G' || membertype == 'P'); {
printf("\n");
}
break;
default:
if (lock != 1) {
printf("\b%c", membertype);
lock = 0;
}
else {
lock = 1;
}
break;
}
fflush(stdin);
}
while (membertype_get != '\r' || (membertype != 'G' && membertype != 'P'));
}
// Assign Member Description and Discount Amount
switch (membertype) {
case 'G':
strcpy(memberdesc, "Gold Class Member");
calcdiscount = 0.1;
strcpy(dispdiscount, "10%");
break;
case 'P':
strcpy(memberdesc, "Platinum Class Member");
calcdiscount = 0.2;
strcpy(dispdiscount, "20%");
break;
default:
strcpy(memberdesc, "Non Member");
calcdiscount = 0;
strcpy(dispdiscount, "0%");
break;
}
printf("Table Number\t\t: ");
// Is the input an integer?
while (scanf("%d", &tbnum) != 1) {
puts("\aERROR\nInvalid table number!\n");
printf("Table Number\t\t: ");
scanf("%d", &tbnum);
fflush(stdin);
}
printf("Choice of Pizza\t\t: ");
// When Input is Invalid, display ERROR (SLIGHTLY BUGGED)
while((scanf("%d", &pzchoice) != 1) || (pzchoice <= 0) || (pzchoice >= 6)) {
puts("\aERROR\nInvalid choice of pizza!\n");
printf("Choice of Pizza\t\t: ");
scanf("%d", &pzchoice);
fflush(stdin);
}
// Assign Pizza Name
switch (pzchoice) {
case 1:
strcpy(pizza, "Pepperoni");
break;
case 2:
strcpy(pizza, "Seafood");
break;
case 3:
strcpy(pizza, "Vegetable");
break;
case 4:
strcpy(pizza, "Hawaiian");
break;
case 5:
strcpy(pizza, "Mixed Combo");
break;
}
printf("Pizza Size? (L/R/P)\t: ");
// Limits user input to L, R and P only.
lock = 0;
do {
pzsize_get = getch();
switch(pzsize_get) {
case 'L':
case 'l':
if (lock == 0) {
printf("L");
lock = 1;
}
else {
printf("\bL");
}
pzsize = 'L';
break;
case 'R':
case 'r':
if (lock == 0) {
printf("R");
lock = 1;
}
else {
printf("\bR");
}
pzsize = 'R';
break;
case 'P':
case 'p':
if (lock == 0) {
printf("P");
lock = 1;
}
else {
printf("\bP");
}
pzsize = 'P';
break;
case '\r':
if (pzsize == 'L' || pzsize == 'R' || pzsize == 'P'); {
printf("\n");
}
break;
default:
if (lock != 1) {
printf("\b%c", pzsize);
lock = 0;
}
else {
lock = 1;
}
break;
}
fflush(stdin);
}
while (pzsize_get != '\r' || (pzsize != 'L' && pzsize != 'R' && pzsize != 'P'));
// Assign Pizza Price and Size Description
switch (pzsize) {
case 'L':
pzprice = 25.90;
break;
case 'R':
pzprice = 18.90;
break;
case 'P':
pzprice = 9.00;
break;
}
printf("Quantity of Pizza\t: ");
// Is the input an integer?
while (scanf("%d", &pzquantity) != 1) {
puts("\aERROR\nInvalid number of pizza!\n");
printf("Quantity of Pizza\t: ");
scanf("%d", &pzquantity);
fflush(stdin);
}
printf("Choice of Drink\t\t: ");
// When Input is Invalid, display ERROR (SLIGHTLY BUGGED)
while((scanf("%d", &drkchoice) != 1) || (drkchoice <= 0) || (drkchoice >= 5)) {
puts("\aERROR\nInvalid choice of drink!\n");
printf("Choice of Drink\t\t: ");
scanf("%d", &drkchoice);
fflush(stdin);
}
// Assign Drink Name and Price
switch (drkchoice) {
case 1:
strcpy(drink, "Orange Juice");
drkprice = 3.20;
break;
case 2:
strcpy(drink, "Coffee");
drkprice = 3.00;
break;
case 3:
strcpy(drink, "Mineral Water (600ml)");
drkprice = 2.20;
break;
case 4:
strcpy(drink, "Pepsi");
drkprice = 2.50;
break;
}
printf("Quantity of Drink\t: ");
scanf("%d", &drkquantity);
// Calculations
pzsubtotal = pzprice * pzquantity;
drksubtotal = drkprice * drkquantity;
totalchrg = pzsubtotal + drksubtotal;
amountdc = totalchrg * calcdiscount;
discounted = totalchrg - amountdc;
// Order Summary
puts("\n- ORDER SUMMARY\n");
// Date & Time
time(&lt);
timeinfo = localtime(&lt);
printf("%s\n", asctime(timeinfo));
printf("(Table %d)\n", tbnum);
printf("Customer Name\t: %s\n", custname);
printf("Membership Type\t: %s (%s Discount)\n", memberdesc, dispdiscount);
puts("=====================================================================\n");
printf(" %-6s%-24s%-15s%-13s%-s\n", "Size", "Item", "Unit Price", "Quantity", "Sub-Total");
puts("=====================================================================\n");
printf(" %-6c%-24sRM %6.2f%10d%10s %6.2f\n", pzsize, pizza, pzprice, pzquantity, "RM", pzsubtotal);
printf(" %-6s%-24sRM %6.2f%10d%10s %6.2f\n", "-", drink, drkprice, drkquantity, "RM", drksubtotal);
printf("%69s\n", "-----------");
printf("%61s%6.2f\n", "Total Charge : RM", totalchrg);
printf("%52s%s%5s%6.2f\n", "Discount (", dispdiscount, ") : RM", amountdc);
printf("%69s\n", "-----------");
printf("%61s%6.2f\n", "Discounted Price : RM", discounted);
// Calculate Tax
tax = discounted * 0.1;
printf("%61s%6.2f\n", "Service Tax (10%) : RM", tax);
printf("%69s\n", "-----------");
// Calculate Total
total = discounted + tax;
printf("%61s%6.2f\n", "Total : RM", total);
// Calculate Roundings
rounded = ceil(total * 10) / 10;
round = rounded - total;
printf("%61s%6.2f\n", "Rounding Adjustment : RM", round);
// Calculate Payment
totalpay = total + round;
printf("%69s\n", "-----------");
printf("%61s%6.2f\n", "Total payment : RM", totalpay);
printf("%69s\n\n", "===========");
printf("%62s", "Paid Cash : RM ");
scanf("%f", &paid);
// Ensure paid amount is more than total payment
while (paid < totalpay) {
printf("%66s","\aERROR\n");
printf("%80s","Insufficient amount!\n");
printf("%62s", "Paid Cash : RM ");
scanf("%f", &paid);
fflush(stdin);
}
// Calculate Change
change = paid - totalpay;
printf("%61s%6.2f\n", "Change : RM", change);
// Display Thank You Message
puts("ALWAYS THE PREFERRED CHOICE!\n");
puts("Pizza House Restaurant (482123-0)\n53300 Setapak, Kuala Lumpur.\n");
printf("\n%s, thank you for visiting Pizza House Restaurant (482123-0)!\nHave a nice day, Please come again ~", custname);
}

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