How to display the all the input string from if else statement? - c

Question

At the end of the program before stating the total cost, I would like the program to list the Item chosen by the user.
Here is my code:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
struct menuDetails {
double total, priceA, priceB, priceC, priceD, priceE, priceF;
} md;
int main()
{
int itemTotal, itemName, itemAll;
int sum=0;
char item;
char itemA[10]= "Nasi Ayam";
char itemB[20]= "Nasi Ayam Merah";
char itemC[15]= "Nasi Kerabu";
char itemD[10]= "Sotong";
char itemE[10]= "Teh Peng";
char itemF[5]= "Kopi";
printf("\t========= Menu =========\n");
printf("Item \t Name \t\t\t Price (RM)\n");
printf("A \t Nasi Ayam \t\t 3.50\n");
printf("B \t Nasi Ayam Merah \t 4.00\n");
printf("C \t Nasi Kerabu \t\t 5.50\n");
printf("D \t Sotong \t\t 2.00\n");
printf("E \t Teh Peng \t\t 2.00\n");
printf("F \t Kopi \t\t\t 2.00\n");
printf("\nHow many items would you like to purchase: ");
scanf("%d", &itemTotal);
printf("You have chose to order %d items\n\n", itemTotal);
for(itemName = 1; itemName <= itemTotal; itemName++)
{
printf("Item %d [Enter Item (A-F)]: ", itemName);
scanf(" %c", &item);
md.priceA = 3.50;
md.priceB = 4.00;
md.priceC = 5.50;
md.priceD = 2.00;
md.priceE = 2.00;
md.priceF = 2.00;
if (item == 'A' || item == 'a') {
printf("%s = RM%.2f\n\n", itemA, md.priceA);
md.total = md.total + md.priceA;
}else if (item == 'B' || item == 'b') {
printf("%s = RM%.2f\n\n", itemB, md.priceB);
md.total = md.total + md.priceB;
}else if (item == 'C' || item == 'c') {
printf("%s = RM%.2f\n\n", itemC, md.priceC);
md.total = md.total + md.priceC;
}else if (item == 'D' || item == 'd') {
printf("%s = RM%.2f\n\n", itemD, md.priceD);
md.total = md.total + md.priceD;
}else if (item == 'E' || item == 'e') {
printf("%s = RM%.2f\n\n", itemE, md.priceE);
md.total = md.total + md.priceE;
}else if (item == 'F' || item == 'f') {
printf("%s = RM%.2f\n\n", itemF, md.priceF);
md.total = md.total + md.priceF;
}
}
printf("The total is RM%.2f", md.total);
time_t my_time = time(NULL);
printf("\nDate: %s", ctime(&my_time));
return 0;
}
The output:
========= Menu =========
Item Name Price (RM)
A Nasi Ayam 3.50
B Nasi Ayam Merah 4.00
C Nasi Kerabu 5.50
D Sotong 2.00
E Teh Peng 2.00
F Kopi 2.00
How many items would you like to purchase: 3
You have chose to order 3 items
Item 1 [Enter Item (A-F)]: a
Nasi Ayam = RM3.50
Item 2 [Enter Item (A-F)]: b
Nasi Ayam Merah = RM4.00
Item 3 [Enter Item (A-F)]: c
Nasi Kerabu = RM5.50
The total is RM13.00
Date: Thu Dec 29 17:02:49 2022
Expected output:
========= Menu =========
Item Name Price (RM)
A Nasi Ayam 3.50
B Nasi Ayam Merah 4.00
C Nasi Kerabu 5.50
D Sotong 2.00
E Teh Peng 2.00
F Kopi 2.00
How many items would you like to purchase: 3
You have chose to order 3 items
Item 1 [Enter Item (A-F)]: a
Nasi Ayam = RM3.50
Item 2 [Enter Item (A-F)]: b
Nasi Ayam Merah = RM4.00
Item 3 [Enter Item (A-F)]: c
Nasi Kerabu = RM5.50
Receipt:
Nasi Ayam
Nasi Ayam Merah
Nasi Kerabu
The total is RM13.00
Date: Thu Dec 29 17:02:49 2022
I want to display the list of item chosen by the user.

Answer 1

You could do this by adding a couple more arrays, and creating a for loop to print out the reciept.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX_ITEMS 10
struct menuDetails {
double total, priceA, priceB, priceC, priceD, priceE, priceF;
} md;
int main()
{
int itemTotal, itemName, itemAll;
int sum=0; // you can remove this, it is unused
char item;
char itemA[10]= "Nasi Ayam";
char itemB[20]= "Nasi Ayam Merah";
char itemC[15]= "Nasi Kerabu";
char itemD[10]= "Sotong";
char itemE[10]= "Teh Peng";
char itemF[5]= "Kopi";
// arrays to store the chosen items and their quantities
char chosenItems[MAX_ITEMS];
int quantities[MAX_ITEMS];
int numChosenItems = 0;
printf("\t========= Menu =========\n");
printf("Item \t Name \t\t\t Price (RM)\n");
printf("A \t Nasi Ayam \t\t 3.50\n");
printf("B \t Nasi Ayam Merah \t 4.00\n");
printf("C \t Nasi Kerabu \t\t 5.50\n");
printf("D \t Sotong \t\t 2.00\n");
printf("E \t Teh Peng \t\t 2.00\n");
printf("F \t Kopi \t\t\t 2.00\n");
printf("\nHow many items would you like to purchase: ");
scanf("%d", &itemTotal);
printf("You have chose to order %d items\n\n", itemTotal);
for(itemName = 1; itemName <= itemTotal; itemName++)
{
printf("Item %d [Enter Item (A-F)]: ", itemName);
scanf(" %c", &item);
md.priceA = 3.50;
md.priceB = 4.00;
md.priceC = 5.50;
md.priceD = 2.00;
md.priceE = 2.00;
md.priceF = 2.00;
// store chosen item and the quantity in array
if (item == 'A' || item == 'a') {
printf("%s = RM%.2f\n\n", itemA, md.priceA);
md.total = md.total + md.priceA;
chosenItems[numChosenItems] = 'A';
quantities[numChosenItems] = 1;
numChosenItems++;
}else if (item == 'B' || item == 'b') {
printf("%s = RM%.2f\n\n", itemB, md.priceB);
md.total = md.total + md.priceB;
chosenItems[numChosenItems] = 'B';
quantities[numChosenItems] = 1;
numChosenItems++;
}else if (item == 'C' || item == 'c') {
printf("%s = RM%.2f\n\n", itemC, md.priceC);
md.total = md.total + md.priceC;
chosenItems[numChosenItems] = 'C';
quantities[numChosenItems] = 1;
numChosenItems++;
}else if (item == 'D' || item == 'd') {
printf("%s = RM%.2f\n\n", itemD, md.priceD);
md.total = md.total + md.priceD;
chosenItems[numChosenItems] = 'D';
quantities[numChosenItems] = 1;
numChosenItems++;
}else if (item == 'E' || item == 'e') {
printf("%s = RM%.2f\n\n", itemE, md.priceE);
md.total = md.total + md.priceE;
chosenItems[numChosenItems] = 'E';
quantities[numChosenItems] = 1;
numChosenItems++;
}else if (item == 'F' || item == 'f') {
printf("%s = RM%.2f\n\n", itemF, md.priceF);
md.total = md.total + md.priceF;
chosenItems[numChosenItems] = 'F';
quantities[numChosenItems] = 1;
numChosenItems++;
}
}
printf("The total is RM%.2f\n\n", md.total);
// Print out the receipt
printf("===== Receipt =====\n");
for (int i = 0; i < numChosenItems; i++) {
if (chosenItems[i] == 'A') {
printf("%d x %s\n", quantities[i], itemA, md.priceA);
} else if (chosenItems[i] == 'B') {
printf("%d x %s\n", quantities[i], itemB, md.priceB);
} else if (chosenItems[i] == 'C') {
printf("%d x %s\n", quantities[i], itemC, md.priceC);
} else if (chosenItems[i] == 'D') {
printf("%d x %s\n", quantities[i], itemD, md.priceD);
} else if (chosenItems[i] == 'E') {
printf("%d x %s\n", quantities[i], itemE, md.priceE);
} else if (chosenItems[i] == 'F') {
printf("%d x %s\n", quantities[i], itemF, md.priceF);
}
}
printf("Total \t\t\t RM%.2f\n", md.total);
time_t my_time = time(NULL);
printf("Date: %s", ctime(&my_time));
return 0;
}
Output:
========= Menu =========
Item Name Price (RM)
A Nasi Ayam 3.50
B Nasi Ayam Merah 4.00
C Nasi Kerabu 5.50
D Sotong 2.00
E Teh Peng 2.00
F Kopi 2.00
How many items would you like to purchase: 3
You have chose to order 3 items
Item 1 [Enter Item (A-F)]: a
Nasi Ayam = RM3.50
Item 2 [Enter Item (A-F)]: b
Nasi Ayam Merah = RM4.00
Item 3 [Enter Item (A-F)]: c
Nasi Kerabu = RM5.50
The total is RM13.00
===== Receipt =====
1 x Nasi Ayam
1 x Nasi Ayam Merah
1 x Nasi Kerabu
Total RM13.00
Date: Thu Dec 29 11:11:24 2022

Answer 2

If you want to list the items stored by the user, and want to allow the user to order the same thing more than once, then one thing you could do is to add an extra counter variable for every menu item. Or even better, make an array, which I call item_counters in the code below:
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
struct menu_item
{
const char *name;
double price;
};
#define NUM_MENU_ITEMS 6
static const struct menu_item menu_items[NUM_MENU_ITEMS] = {
{ "Nasi Ayam", 3.50 },
{ "Nasi Ayam Merah", 4.00 },
{ "Nasi Kerabu", 5.50 },
{ "Sotong", 2.00 },
{ "Teh Peng", 2.00 },
{ "Kopi", 2.00 }
};
int main( void )
{
int total_items;
int item_counters[NUM_MENU_ITEMS] = {0};
double total_cost = 0.0;
//print the menu using a loop
printf("\t========= Menu =========\n");
printf("Item Name Price (RM)\n");
for ( int i = 0; i < NUM_MENU_ITEMS; i++ )
{
printf(
"%-8c %-22s %lf\n",
'A'+i, menu_items[i].name, menu_items[i].price
);
}
printf( "\nHow many items would you like to purchase: ");
if ( scanf( "%d", &total_items ) != 1 )
{
fprintf( stderr, "Input error!\n" );
exit( EXIT_FAILURE );
}
printf( "You have chosen to order %d items.\n\n", total_items );
//ask user to select items
for( int i = 0; i < total_items; i++ )
{
char item;
//prompt user to select item
printf( "Item %d [Enter Item (A-%c)]: ", i, 'A'+(NUM_MENU_ITEMS-1) );
//attempt to read one character
if ( scanf( " %c", &item ) != 1 )
{
fprintf( stderr, "Input error!\n" );
exit( EXIT_FAILURE );
}
//make input upper-case, if it is lower-case
item = toupper( (unsigned char)item );
//verify that character is valid
if ( item < 'A' || item > 'A' + (NUM_MENU_ITEMS-1) )
{
printf( "Invalid input!\n" );
exit( EXIT_FAILURE );
}
//increment counter for selected item
item_counters[item-'A']++;
}
//print back the order to the user, and calculate total cost
printf( "\nYou ordered:\n" );
for ( int i = 0; i < NUM_MENU_ITEMS; i++ )
{
if ( item_counters[i] != 0 )
{
double total_cost_for_item;
total_cost_for_item = item_counters[i] * menu_items[i].price;
printf(
"%d %s for %lf\n",
item_counters[i], menu_items[i].name, total_cost_for_item
);
total_cost += total_cost_for_item;
}
}
//print total cost
printf( "\nThe total is RM%.2f\n", total_cost );
//print time
time_t my_time = time(NULL);
printf( "Date: %s\n", ctime(&my_time));
return 0;
}
This program has the following behavior:
========= Menu =========
Item Name Price (RM)
A Nasi Ayam 3.500000
B Nasi Ayam Merah 4.000000
C Nasi Kerabu 5.500000
D Sotong 2.000000
E Teh Peng 2.000000
F Kopi 2.000000
How many items would you like to purchase: 5
You have chosen to order 5 items.
Item 0 [Enter Item (A-F)]: a
Item 1 [Enter Item (A-F)]: b
Item 2 [Enter Item (A-F)]: c
Item 3 [Enter Item (A-F)]: a
Item 4 [Enter Item (A-F)]: d
You ordered:
2 Nasi Ayam for 7.000000
1 Nasi Ayam Merah for 4.000000
1 Nasi Kerabu for 5.500000
1 Sotong for 2.000000
The total is RM18.50
Date: Thu Dec 29 15:54:04 2022
Note that I have modified your program in such a way that you can easily change the number of items in the menu, and the program will automatically adapt. For example, I can simply change
#define NUM_MENU_ITEMS 6
to
#define NUM_MENU_ITEMS 7
and add one item to the list:
static const struct menu_item menu_items[NUM_MENU_ITEMS] = {
{ "Nasi Ayam", 3.50 },
{ "Nasi Ayam Merah", 4.00 },
{ "Nasi Kerabu", 5.50 },
{ "Sotong", 2.00 },
{ "Teh Peng", 2.00 },
{ "Kopi", 2.00 },
{ "Cheese Sandwich", 3.00 }
};
As you can see, the program will adapt itself automatically:
========= Menu =========
Item Name Price (RM)
A Nasi Ayam 3.500000
B Nasi Ayam Merah 4.000000
C Nasi Kerabu 5.500000
D Sotong 2.000000
E Teh Peng 2.000000
F Kopi 2.000000
G Cheese Sandwich 3.000000
How many items would you like to purchase: 5
You have chosen to order 5 items.
Item 0 [Enter Item (A-G)]: A
Item 1 [Enter Item (A-G)]: G
Item 2 [Enter Item (A-G)]: C
Item 3 [Enter Item (A-G)]: G
Item 4 [Enter Item (A-G)]: F
You ordered:
1 Nasi Ayam for 3.500000
1 Nasi Kerabu for 5.500000
1 Kopi for 2.000000
2 Cheese Sandwich for 6.000000
The total is RM17.00
Date: Thu Dec 29 16:00:03 2022
The menu output was automatically adapted and it now asks and accepts input from A to G instead of from A to F. That is the advantage of not hard-coding anything in your program, except in one place.
It is worth noting that this program assumes that the character codes
of the alphabet are stored consecutively in the character
set, which is the case for most character sets, including the ASCII character set. However, this may not be the case on some more exotic platforms. On those platforms, the code would not work.