how to repeat a menu switch?

[clairelee0322]

Here's my program, the only problem is that I don't know how to display the menu again after the user used the calcultor. I know it has do with DO WHILE LOOP but I don't know how to put it.. please help me out! Thanks!!



[CODE=cpp]//Claire's Calculator
#include <iostream.h>
#include <math.h>
double pow(double x, double y);


main()
{
int choice, choicee;
const double PI = 3.14159;
float a, b, c;
int n, m, i;
double cy;
double x, y;
float x_to_the_y;
double r;
int re, q;

do
{
cout << "Which calculation you wish to use?" << '\n';
cout << "1 - Addition" << '\n';
cout << "2 - Subtraction" << '\n';
cout << "3 - Multiplication" << '\n';
cout << "4 - Division " << '\n';
cout << "5 - Multiplication by a percent " << '\n';
cout << "6 - Calculate powers" << '\n';
cout << "7 - Calculate a circle" << '\n';
cout << "8 - Calculate an exponential" << '\n';
cin >> choice; //get choice from the user
if ((choice < 1 ) || (choice > 8))
{
cout << "Re-enter your choice.\n";
}
}
while ((choice < 1 ) || (choice > 8));

switch(choice)
{
case 1: // Addition
cout << "enter 1st number: \n";
cin >> a;
cout << "enter 2nd number: \n";
cin >> b;
cout << "a + b =" << a + b << '\n';
break;
case 2: //Subtraction
cout << "Enter first number: \n";
cin >> a;
cout << "Enter second number: \n";
cin >> b;
cout << "a - b = " << a - b << '\n';
break;
case 3: //Multiplication
cout << "Enter first number: \n";
cin >> a;
cout << "Enter second number: \n";
cin >> b;
cout << "a * b = " << a * b << '\n';
break;
case 4: //Division
do {
cout << "1 - answer as a decimal\n";
cout << "2 - answer as a fraction\n";
cout << "3 - answer as a number with a remainder\n";
cin >> choicee;
}
while ((choicee < 1 ) || (choicee > 3));

switch(choicee)
{
case 1: //answer as a decimal
cout << "Enter first number: \n";
cin >> a;
cout << "Enter second number: \n";
cin >> b;
cy = a / b;
cout << "answer = " << cy << '\n';
break;
case 2: //answer as a fraction
i = 0;
int Denom, Num;
cout << "Enter first number: \n";
cin >> Denom;
cout << "Enter second number: \n";
cin >> Num;
n = Denom;
m = Num;
for (i = n * m; i > 1; i--)
{
if ((n % i == 0) && (m % i == 0))
{
n /= i;
m /= i;
cout << "answer=" << n << "/" << m << '\n';
}
}
break;
case 3: //answer as a number with a remainder
cout << "Enter first number: \n";
cin >> a;
cout << "Enter second number: \n";
cin >> b;
q = a / b;
re = (int)a % (int)b;
cout << "quotient = " << q << '\n';
cout << "reminder = " << re << '\n';
break;
}
break;
case 5: //Multiplication by a percent
cout << "Enter first number: \n";
cin >> a;
cout << "Enter second number:(percent age) \n";
cin >> b;
c = a * (b / 100);
cout << "answer = " << c << '\n';
break;
case 6: //Calculate powers
double pow(double x, double y);
cout << "Enter first number: \n";
cin >> x;
cout << "Enter the power: \n";
cin >> y;
x_to_the_y = pow(x, y);
cout << "answer = " << x_to_the_y << '\n';
break;
case 7: //Calculate a circle
cout << "Please enter r = \n";
cin >> r;
cout << "The area is " << PI * r * r << '\n';
break;
case 8: // Calculate an exponential
cout << "Enter first number: \n";
cin >> a;
double pow(double x, double y);
cout << "Enter second number: \n";
cin >> x;
cout << "Enter the power: \n";
cin >> y;
x_to_the_y = pow(x, y);
cout << "answer = " << a * x_to_the_y << '\n';
break;
}
return 0;

}[/CODE]

[Ganon11]

You are correct, it has to do with a do...while loop. What will be the end condition? What do you want to loop? Answer these questions and you will be 95% of the way to your answer.

[clairelee0322]

You are correct, it has to do with a do...while loop. What will be the end condition? What do you want to loop? Answer these questions and you will be 95% of the way to your answer.

mm.. I want it to display its menu again after the user used the calculator once.....The end condition? what do you mean? When the case ends? ??

[Ganon11]

Exactly. When do you want this loop to stop e.g. the menu to stop displaying? Do you want it stop when the user enters a certain character (N)? Do you want it to stop when the result they got is larger than some number? Do you want it to randomly stop?

[clairelee0322]

Exactly. When do you want this loop to stop e.g. the menu to stop displaying? Do you want it stop when the user enters a certain character (N)? Do you want it to stop when the result they got is larger than some number? Do you want it to randomly stop?

Thanks alot! Ganon11!! :D ^^

[code=c;pp]
#
break;
#
case 8: // Calculate an exponential
#
cout << "Enter first number: \n";
#
cin >> a;
#
double pow(double x, double y);
#
cout << "Enter second number: \n";
#
cin >> x;
#
cout << "Enter the power: \n";
#
cin >> y;
#
x_to_the_y = pow(x, y);
#
cout << "answer = " << a * x_to_the_y << '\n';
#
continue;
#
}
#
return 0;




If I change all the break; to continue; , the program will continue forever right??




or the other way? I am not sure althoughI looked up for some resources

#

#
do
#
{
#
cout << "Which calculation you wish to use?" << '\n';
#
cout << "1 - Addition" << '\n';
#
cout << "2 - Subtraction" << '\n';
#
cout << "3 - Multiplication" << '\n';
#
cout << "4 - Division " << '\n';
#
cout << "5 - Multiplication by a percent " << '\n';
#
cout << "6 - Calculate powers" << '\n';
#
cout << "7 - Calculate a circle" << '\n';
#
cout << "8 - Calculate an exponential" << '\n';
#
cin >> choice; //get choice from the user
#
if ((choice < 1 ) || (choice > 8))
#
{
#
cout << "Re-enter your choice.\n";
#
}
#
continue;
}
#
while ((choice < 1 ) || (choice > 8));[/code]

[sicarie]

clairelee0322-

Please have a look at this, it explains how to use code tags when posting. Thanks