I'm trying to make an template which is my class assignment.
I used a switch statement in the do while loop while the condition is if enter variable not equal to 16 you should terminate the program
I'vve already used break statment in every case but it isn't working
#include <iostream>
using namespace std;
int main()
{
int op;
cout << "Please enter choice between 1 to 15 For Different Operations "
<< endl;
cout << "1. Create List(create a new list(presumably empty))" << endl;
cout << "2. Insertion" << endl;
cout << "3. Deletion" << endl;
cout << "4. Update(replace the element)" << endl;
cout << "5. Start" << endl;
cout << "6. Next" << endl;
cout << "7. Back" << endl;
cout << "8. Tail" << endl;
cout << "9. Find" << endl;
cout << "10. Copy" << endl;
cout << "11. Get(display current index and element)" << endl;
cout << "12. Size / length" << endl;
cout << "13. Display list" << endl;
cout << "14. De - allocate list" << endl;
cout << "15. Exit" << endl;
cin >> op;
do {
switch (op) {
case 1:
cout << "Creating the List" << endl;
break;
case 2:
cout << "inserting... " << endl;
break;
case 3:
cout << "Deleting... " << endl;
break;
case 4:
cout << "updating... " << endl;
break;
case 5:
cout << "starting... " << endl;
break;
case 6:
cout << "next... " << endl;
break;
case 7:
cout << "back... " << endl;
break;
case 8:
cout << "Tail... " << endl;
break;
case 9:
cout << "Find... " << endl;
break;
case 10:
cout << "Copying... " << endl;
break;
case 11:
cout << "Getting... " << endl;
break;
case 12:
cout << "Size... " << endl;
break;
case 13:
cout << "Display... " << endl;
break;
case 14:
cout << "Deallocate... " << endl;
break;
case 15:
terminate;
break;
default:
cout << "Please enter the correct choice " << endl;
break;
}
} while (op != 16);
return 0;
}
i expect the the cout output in every choice user made and then stop for taking input
from your original code
cin >> op;
do {
switch (op)
so you read from cin outside the loop and never read again, reordering so you read at every loop pass will ask you again the desired operation
do {
cin >> op;
switch (op)
Additionally note that break does not break the loop it just breaks from the switch. Without the break the instructions from the next case will be executed as well in the switch.
If you want to break from the loop under some conditions you need to add a break outside of the switch statement, you can use a variable to "remember" if you should leave the loop.
However since you have an exit condition in your typed instructions why not make the loop exit
} while (op != 15);
which seems to make sense because of the
cout << "15. Exit" << endl;
line.
I am brand new to programming and am doing coding challenges found from here http://www.cplusplus.com/forum/articles/12974/. I cannot find the answer to my specific question through google searches, this is my first time posting here so I apologize if I've broken any guidelines! I am looking at the challenge which makes a user pick a number to select their favorite beverage.
I just learned about the switch statement and i named 5 cases, not including the default. I was trying to figure out how to incorporate an if statement inside of a switch statement (if this is even possible), or maybe it's a for loop that i am looking for? I am not sure but i'm willing to learn about whatever it is. I am trying to make it so that if the user does not enter a valid case number and it goes to default. (ex: anything other than 1, 2, 3, 4, or 5) I want the user to make another attempt at entering a correct number when it hits the default case.
This is my code
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
int main()
{
int choice;
cout << "Choose your beverage of choice by number: " << endl;
cout << "1. Coke" << endl;
cout << "2. Dr. Pepper" << endl;
cout << "3. Sprite" << endl;
cout << "4. Iced Tea" << endl;
cout << "5. Water" << endl;
cout << '\n';
cin >> choice;
cout << '\n' << "Choice entered: " << choice << endl;
cout << '\n';
switch (choice)
{
case 1 : cout << "You have chosen Coke." << endl;
break;
case 2 : cout << "You have chosen Dr. Pepper." << endl;
break;
case 3 : cout << "You have chosen Sprite." << endl;
break;
case 4 : cout << "You have chosen Iced Tea." << endl;
break;
case 5: cout << "You have chosen Water." << endl;
break;
default:
cout << "Error. Choice Not valid. Money returned." << endl;
break;
}
system("pause");
return 0;
}
I am trying to make it so that if the user does not enter a valid case number and it goes to default. (ex: anything other than 1, 2, 3, 4, or 5) I want the user to make another attempt at entering a correct number when it hits the default case.
One way to make this happen is to put a do-while loop around the block of code that receives user input and the switch statement.
int main()
{
bool isValidChoice = true;
do
{
// Reset when the loop is run more than once.
isValidChoice = true;
int choice;
cout << "Choose your beverage of choice by number: " << endl;
cout << "1. Coke" << endl;
cout << "2. Dr. Pepper" << endl;
cout << "3. Sprite" << endl;
cout << "4. Iced Tea" << endl;
cout << "5. Water" << endl;
cout << '\n';
cin >> choice;
cout << '\n' << "Choice entered: " << choice << endl;
cout << '\n';
switch (choice)
{
case 1 :
cout << "You have chosen Coke." << endl;
break;
case 2 :
cout << "You have chosen Dr. Pepper." << endl;
break;
case 3 :
cout << "You have chosen Sprite." << endl;
break;
case 4 :
cout << "You have chosen Iced Tea." << endl;
break;
case 5:
cout << "You have chosen Water." << endl;
break;
default:
cout << "Error. Choice Not valid. Money returned." << endl;
isValidChoice = false;
break;
}
} while ( !isValidChoice );
}
I have a for loop where when the quantity number is entered, the loop will run for the amount of quantity entered. But unfortunately the output summary only displays one output.
For example, when user enters the quantity number of 2, the loop of choosing the pizza, size and add on runs twice but the summary output in this particular line cout << sizetype << "/t" << pizzatype << "/t" << price << endl; only displays one output. Nevertheless, I want to display both of the output which has been entered by user.
Need help on this.
case 2:
cin >> quantity;
for(int i=0; i<quantity; i++)
cout << "**Pizza Favourites**" << endl;
cout << "1. Italian Aloha" << endl;
cout << "2. Vegi Lover" << endl;
cout << "3. Ocean Delite" << endl << endl;
cout << "Choose Your Pizza (Enter Integer 1-3 Only) : ";
cin >> pizza;
switch (pizza)
{
case 1:
cout << "You've ordered Italian Aloha Pizza" << endl;
pizzatype = "Italian Aloha Pizza";
break;
case 2:
cout << "You've ordered Vegi Lover Pizza" << endl;
pizzatype = "Vegi Lover Pizza";
break;
case 3:
cout << "You've ordered Ocean Delite Pizza" << endl;
pizzatype = "Ocean Delite Pizza";
break;
default:
cout << "Invalid Input" << endl;
break;
}
cout << "**Pizza Sizes**" << endl;
cout << "1. Regular (R)" << endl;
cout << "2. Large (L)" << endl;
cout << "3. X-Large (X)" << endl << endl;
cout << "Choose Your Pizza Size (Enter Integer 1-3 Only) : ";
cin >> size;
switch (size)
{
case 1:
cout << "You've Chose Regular Sized Pizza" << endl;
sizetype = "Regular";
price = newRegular;
break;
case 2:
cout << "You've Chose Large Sized Pizza" << endl;
sizetype = "Large";
price = newLarge;
break;
case 3:
cout << "You've Chose X-Large Sized Pizza" << endl;
sizetype = "X-Large";
price = newXlarge;
break;
default:
cout << "Invalid Input" << endl;
break;
}
}
cout << "**Add On**" << endl;
cout << "Do You Want To Add On Extra Cheese ? (Enter Y for Yes and N for No) : ";
cin >> yesNo;
switch (yesNo)
{
case 'Y':
cout << "More Cheese, More Fun !" << endl;
cheesePrice = newCheese;
break;
case 'N':
cout << "No Extra Cheese Required !" << endl;
cheesePrice;
break;
default:
cout << "Invalid Input" << endl;
break;
}
cout << "WONDER PIZZA" << endl;
cout << "************" << endl;
cout << sizetype << "/t" << pizzatype << "/t" << price << endl;
cout << "Extra Cheese : " << cheesePrice << endl;
total = price + cheesePrice;
cout << "Total Payment : " << total << endl;
cout << "Please Insert Your Payment : " << payment << endl;
change = payment - total;
cout << "Change" << change << endl;
break;
Yes, you can nest a switch statement inside the case of an outer switch statement.
The break on an inner case will be in the context of the inner switch.
(Does that answer your question? I wasn't sure that was your question.)
I got 158, 1000, and 140 for the money outputs while I played.
The original amount I put in was 100.
The total amount of money and the amount of money entered by the user aren't showing up correctly when ran.
Sometimes, the total and the amount entered displays correctly, it should be noted.
But not always, and that's a problem.
There is some logic error(s) I can't figure out. Help?
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
#include <stdlib.h>
using namespace std;
void switchStatementsCalculations (int &slot1, int &slot2, int &slot3, string cherries, string
oranges, string plums, string bells, string melons, string bars);
void calculateAmountEarnedByPlaying (double &money, int slot1, int slot2, int slot3,
double &total);
int main()
{
int slot1;
int slot2;
int slot3;
double money=0;
double total=0;
double amountOfMoneyEnterd=0;
int count;
string cherries = "cherries";
string oranges = "oranges";
string plums = "plums";
string bells = "bells";
string melons = "melons";
string bars = "bars";
string doAgain;
cout << "We are going to be playing a slot machine game today." << endl;
srand(time(0));
do
{
cout << "Please enter the amount of money you'd like to insert into the slot machine. We will pull the lever for you." << endl;
cin >> money;
cout << "You put in $" << money << endl;
slot1=rand()%6+1;
slot2=rand()%6+1;
slot3=rand()%6+1;
switchStatementsCalculations(slot1, slot2, slot3, cherries, oranges, plums, bells, melons, bars);
calculateAmountEarnedByPlaying(money, slot1, slot2, slot3, total);
amountOfMoneyEnterd=(amountOfMoneyEnterd+money);
cout << "Would you like to play again? Please type yes if so." << endl;
cin >> doAgain;
if(doAgain!= "yes")
{
cout << "The total amount of money you put in the slot machine is " << amountOfMoneyEnterd << endl;
cout << "The total amount of money you won is $" << total << endl;
}
}
while(doAgain=="yes");
system("Pause");
return 0;
}
void switchStatementsCalculations(int &slot1, int &slot2, int &slot3, string cherries, string
oranges, string plums, string bells, string melons, string bars)
{
switch (slot1)
{
case 1:
cout << "You got " << cherries << endl;
case 2:
cout << "You got " << oranges << endl;
break;
case 3:
cout << "You got " << plums << endl;
break;
case 4:
cout << "You got " << bells << endl;
break;
case 5:
cout << "You got " << melons << endl;
break;
case 6:
cout << "You got " << bars << endl;
}
switch (slot2)
{
case 1:
cout << "You got " << cherries << endl;
break;
case 2:
cout << "You got " << oranges << endl;
break;
case 3:
cout << "You got " << plums << endl;
break;
case 4:
cout << "You got " << bells << endl;
break;
case 5:
cout << "You got " << melons << endl;
break;
case 6:
cout << "You got " << bars << endl;
}
switch (slot3)
{
case 1:
cout << "You got " << cherries << endl;
break;
case 2:
cout << "You got " << oranges << endl;
break;
case 3:
cout << "You got " << plums << endl;
break;
case 4:
cout << "You got " << bells << endl;
break;
case 5:
cout << "You got " << melons << endl;
break;
case 6:
cout << "You got " << bars << endl;
}
}
void calculateAmountEarnedByPlaying(double &money, int slot1, int slot2, int slot3, double &total)
{
double won=0;
if(slot1==slot2 || slot1==slot3 || slot2==slot3)
{
cout << "Congratulations! You won." << endl;
won=(money * 2);
cout << "You won " << won << endl;
}
else if ((slot1==slot2 && slot1==slot3) || (slot2==slot1 && slot2==slot3) || (slot3==slot1 && slot3==slot2))
{
cout << "Congratulations! You won." << endl;
won=(money*3);
cout << "You won " << won << endl;
}
else
{
cout << "You didn't earn any money." << endl;
}
total=(total+won);
}
One mistake is this in your calculateAmountEarnedByPlaying function:
double won;
You did not initialize this variable, thus it contains an indeterminate value.
It is only set if you've won something, but not set if you didn't win. You then do this at the end of your function:
total = (total + won);
If won is not initialized, then total will also be set to an indeterminate value (or undefined behavior occurs).
The won variable should be initialized to 0:
double won = 0;
Most compilers give a warning if you access an uninitialized variable like this. Please check that you have your warnings on to detect these issues.
The other issue is that you forgot a break in your switch statements:
switch (slot1)
{
case 1:
cout << "You got " << cherries << endl; // no break statement
case 2:
cout << "You got " << oranges << endl;
break;
If slot1 is 1, it will print both sets of output for case 1 and case 2.
None of this would be necessary if you used arrays instead of 6 separate variables and 6 separate lines of output:
std::string slot_items[] = {"cherries", "oranges", "plums", "bells", "melons", "bars"};
//...
int slots[3];
//...
for (int i = 0; i < 3; ++i)
slots[i] = rand()%6+1;
//...
// inside the function...
//...
for (int i = 0; i < 3; ++i)
cout << "You got " << slot_items[slots[i]] << endl;
A two line for loop replaces 60 lines of switch and case statements.
cin is really difficult for me to understand with c++.
I want to choose an item on the menu but I want it to be clean, however I am running into issues with cin.fail.
I realize cin.fail checks the datatype so I should be clear when it comes to other data types.
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
int number;// define an integer variable called number
float cost;// a floating point variable called cost,
char beverage;// and a character variable called beverage
bool validBeverage;
cout << fixed << showpoint << setprecision(2);
do
{
cout << endl << endl;
cout << "Hot Beverage Menu" << endl << endl;
cout << "A: Coffee $1.00" << endl;
cout << "B: Tea $ .75" << endl;
cout << "C: Hot Chocolate $1.25" << endl;
cout << "D: Cappuccino $2.50" << endl <<endl << endl;
cout << "Enter the beverage A,B,C, or D you desire" << endl;
cout << "Enter E to exit the program" << endl << endl;
do
{
cin >> beverage;// Fill in the code to read in beverage
if (cin.fail)
{
cout << "You have entered an invalid value." << endl
<< "Please enter the letter corresponding to the menu." << endl;
}
} while (cin.fail);
switch(beverage)
{
case 'a': validBeverage = true;
case 'A': validBeverage = true;
case 'b': validBeverage = true;
case 'B': validBeverage = true;
case 'c': validBeverage = true;
case 'C': validBeverage = true;
case 'd': validBeverage = true;
case 'D': validBeverage = true;
break;
default: validBeverage = false;
}// end switch beverage
if (validBeverage == true)
{
do
{
cout << "How many cups would you like?" << endl;
// Fill in the code to read in number
cin >> number;
if (cin.fail() || number <= 0)
{
cout << "You have entered an invalid value." << endl <<
"Please enter an integer greater than 0." << endl;`enter code here`
}
} while (cin.fail() || number <= 0);
}
switch (beverage)// Fill in the code to begin a switch
statement that is controlled by beverage
{
case 'a': (float)cost = number * 1.0;
cout << "The total cost is $ " << cost << endl;
break;
case 'A': (float)cost = number * 1.0;
cout << "The total cost is $ " << cost << endl;
break;
case 'b': (float)cost = number * 0.75;// Fill in the
code to give the case for tea ( $0.75 a cup)
cout << "The total cost is $ " << cost << endl;
break;
case 'B': (float) cost = number * 0.75;// Fill in the
code to give the case for hot chocolate ($1.25 a cup)
cout << "The total cost is $ " << cost << endl;
break;
case 'c': (float)cost = number * 1.25;
cout << "The total cost is $ " << cost << endl;
break;
case 'C': (float)cost = number * 1.25;
cout << "The total cost is $ " << cost << endl;
break;
case 'd': (float)cost = number * 2.50;// Fill in the
code to give the case for cappuccino ($2.50 a cup)
cout << "The total cost is $ " << cost << endl;
break;
case 'D': (float)cost = number * 2.50;// Fill in the
code to give the case for cappuccino ($2.50 a cup)
cout << "The total cost is $ " << cost << endl;
break;
case 'e':
cout << "Please come again." << endl;
break;
case 'E':
cout << " Please come again." << endl;
break;
default:cout << "Invalid Selection."; // Fill in the
code to write a message indicating an invalid selection.
cout << " Try again please" << endl;
}
}while (beverage != 'e' || beverage != 'E'); // Fill in the code to
finish the do-while statement with the condition that beverage does not
equal E or e.
// Fill in the appropriate return statement
return 0;
}
Try using: if(!cin) which checks for data type on input.