Little bit confused with the Switch Statements - c

Question

I'm very new to C programming, and I need a help!
I have made a program of calculator with the help of Switch Statement and I want this program to be in a loop, So that it ask the menu (i.e Enter your Choice: Divide,Multiplication,Addition etc) again and again with the user.
Also I want, an End option with the Cases in Menu, which will close the program. I don't know how to code that End option which will make the Program Close.
Please Help!
#include<stdio.h>
#include<conio.h>
int main()
{
int a,b,choice;
float sum,mul,div,sub,quo;
printf("\n\t\t\t\t CALCULATOR");
printf("\nEnter the First Number: ");
scanf("%d",&a);
printf("Enter the Second Number: ");
scanf("%d",&b);
printf("\n Enter Your Choice");
printf("\n\n1.Sum");
printf("\n2.Multiplication");
printf("\n3.Division");
printf("\n4.Subtraction");
printf("\n5.Quotient");
printf("\nYOUR CHOICE: ");
scanf("%d",&choice);
switch(choice)
{
case 1:
sum=a+b;
printf("Sum= %f\n",sum);
break;
case 2:
mul=a*b;
printf("Multiplication= %f\n",mul);
break;
case 3:
div=a/b;
printf("Division= %lf\n",div);
break;
case 4:
sub=a-b;
printf("Subtraction= %f\n",sub);
break;
case 5:
quo=a%b;
printf("Quotient= %f\n",quo);
break;
default:
printf("\n Unavailable Choice");
}
return 0;
getch();
}

Answer 1

Assuming you add option number 6 to close the calculator, you can add the following case to quit the program -
case 6:
// print bye message or whatever
exit(0);
break;
You can read about the exit function and what the arguments passed to it mean. Usually a 0 indicates successful exit from the program.
You also need to include stdlib.h if you want to use exit.

Answer 2

I would suggest introducing a loop condition variable, eg. CarryOn, initialise it to 1, and use that in a while loop. Let the loop continue as long as the variable is 1. When the user selects "End", set the variable to 0 in the case. That will end the loop.
Let me clarify it with some example code outline:
int CarryOn = 1;
while (CarryOn == 1)
{
// ...your original code
// ...
// add to switch
case 6: // 6 will be the "End" / "Exit" option
CarryOn = 0;
break;
}

Answer 3

You will need to have a while loop.
while(true){
printf("\n\t\t\t\t CALCULATOR");
printf("\nEnter the First Number: ");
scanf("%d",&a);
....
//return 0; remove the return statement
getch();
}
and also add the menu item 6) Exit to your printf and handle that option as described in the one of the answers above.
case 6:
// print bye message or whatever
exit(0);
break;