Need Help ASAP with a Loop

[KeegM480]

Write your question here.

  // Calculator, by Keegan Mathur

// Include the iostream library
#include <iostream>

//Use the standard namespace
using namespace std;

void main ( )
{
   // Declare the variables
   int Guess = 1;
   while (Guess != Secret_Number)
{

      //This code repeats until the condition is no longer true

            // Declare the variables
            float Number_1;
            float Number_2;
            float Result;
            int Which_Calculation;

           // Give instructions
           cout << "Choose a task. Press 1 to add, 2 to subtract, 3 to multiply, and 4 to divide." << endl;
           cin >> Which_Calculation;

           // Get numbers
           cout << "Please enter the first number." << endl;
           cin >> Number_1;
           cout << "Please enter the second number." << endl;
           cin >> Number_2;

           if (Which_Calculation == 1)
           {
              // Calculate the result
              Result = Number_1 + Number_2;
           }

           if (Which_Calculation == 2)
           {
              // Calculate the result
              Result = Number_1 - Number_2;
           }

           if (Which_Calculation == 3)
           {
              // Calculate the result
              Result = Number_1 * Number_2;
           }

           if (Which_Calculation == 4)
           {
              // Calculate the result
              Result = Number_1 / Number_2;
           }
           // Print the answer is...
           cout << "The answer is..." << endl;

           //Print the result
           cout << Result << endl;

   }

   system ("PAUSE");

    
}

I am trying to get this code to loop, it was due on Tuesday and I have been back and forth with my teacher, I need the Calculator to loop if "1" is pressed and exit if any other key is pressed. PLEASE HELP ME!

[o3hC5Di1]

Hi there,

You need to actually allow the user to change that variable.
Somewhere within your loop (probably at the end of it) you'll want to do something like:

std::cout << "Enter 1 to make another calculation or any other number to quit: ";
std::cin >> Guess;

Also, you'll want to make SecretNumber equal to 1 at the top of main():

const int SecretNumber=1;

Hope that helps, please do let us know if you have any further questions.

All the best,
NwN

[KeegM480]

// Calculator, by Keegan Mathur

// Include the iostream library
#include <iostream>

//Use the standard namespace
using namespace std;

void main ( )
{
// Declare the variables
int Secret_Number = 1;
while (Guess != Secret_Number)
{

//This code repeats until the condition is no longer true

// Declare the variables
float Number_1;
float Number_2;
float Result;
int Which_Calculation;

// Give instructions
cout << "Choose a task. Press 1 to add, 2 to subtract, 3 to multiply, and 4 to divide." << endl;
cin >> Which_Calculation;

// Get numbers
cout << "Please enter the first number." << endl;
cin >> Number_1;
cout << "Please enter the second number." << endl;
cin >> Number_2;

if (Which_Calculation == 1)
{
// Calculate the result
Result = Number_1 + Number_2;
}

if (Which_Calculation == 2)
{
// Calculate the result
Result = Number_1 - Number_2;
}

if (Which_Calculation == 3)
{
// Calculate the result
Result = Number_1 * Number_2;
}

if (Which_Calculation == 4)
{
// Calculate the result
Result = Number_1 / Number_2;
}
// Print the answer is...
cout << "The answer is..." << endl;

//Print the result
cout << Result << endl;

cout << "Enter 1 to make another calculation or any other number to quit: ";
cin >> Guess;

}

system ("PAUSE");


}


Two Errors? Thank you very much though, I am out over 100 points if I dont get this in soon (would take me from an A- to a C+) and the teacher is gone...

[mobotus]

while (Guess != Secret_Number)

You didn't define Guess in your second post int, float, double, etc.

[KeegM480]

No errors now but it just opens CMD and says "Press any key to continue..." and does not run the application
// Calculator, by Keegan Mathur

// Include the iostream library
#include <iostream>

//Use the standard namespace
using namespace std;

void main ( )
{
// Declare the variables
int Secret_Number = 1;
int Guess = 1;
while (Guess != Secret_Number)
{

//This code repeats until the condition is no longer true

// Declare the variables
float Number_1;
float Number_2;
float Result;
int Which_Calculation;

// Give instructions
cout << "Choose a task. Press 1 to add, 2 to subtract, 3 to multiply, and 4 to divide." << endl;
cin >> Which_Calculation;

// Get numbers
cout << "Please enter the first number." << endl;
cin >> Number_1;
cout << "Please enter the second number." << endl;
cin >> Number_2;

if (Which_Calculation == 1)
{
// Calculate the result
Result = Number_1 + Number_2;
}

if (Which_Calculation == 2)
{
// Calculate the result
Result = Number_1 - Number_2;
}

if (Which_Calculation == 3)
{
// Calculate the result
Result = Number_1 * Number_2;
}

if (Which_Calculation == 4)
{
// Calculate the result
Result = Number_1 / Number_2;
}
// Print the answer is...
cout << "The answer is..." << endl;

//Print the result
cout << Result << endl;

cout << "Enter 1 to make another calculation or any other number to quit: ";
cin >> Guess;

}

system ("PAUSE");


}

[Chervil]

Looks like its doing what you asked.

    int Secret_Number = 1;
    int Guess = 1;
    while (Guess != Secret_Number) { }
    system ("PAUSE");

The while condition is false, so execution continues at the last line of the program.

[KeegM480]

Ok, I fixed that issue by making "int Guess = 2"
How do I get the application to close itself if you dont press the 1 key?

[mobotus]

Not sure I am following your question.

Your program exits the loop now buy the user entering a sentinel value, and main ends.

Do you want it to exit some other way?

cout << "How many problems would you like to do?";
cin >> somevar;

while(somevar > 0){

//Code

somevar--;
}

[o3hC5Di1]

Hi there,

Please note that in C++, main() returns an int:

int main(int argc, char** argv)

This matters because now, in order to exit the program, you can return a number from the main function (the number zero is used to indicate successful running and exiting of the program).

int main(int argc, char** argv)
{
    //variables
    while (Guess == 1)
   {
        //loop stuff
    }

    return 0; //out of the loop, exit the program
}

You will need to remove system("PAUSE");, the loop keeps the console windows open for you as long as needed.

All the best,
NwN

[KeegM480]

Sorry for such a late reply, major computer issues. I got it working not sure how but its working :) thank you guys very much!