HELP: C Prog calculator looping!

Hi guys can you help me with my calculator? I want to give loop to my codes using do while loop. Is it possible? and add "Q" for Quit/Exit.

Here are my codes:

Can you give me an I dea?

 

Following code compiles fine with Dev C++ (mingw)

#include <stdio.h>
#include <conio.h> //for getch
#include <cstdlib> //for system
int main()
{
	float left, right, answer;
	float sum,difference,product,qoutient;
	char oper;

	char ch=0;

	while(1) 
	{
		system("cls");
		printf("Q) Quit / Exit\nAny other key to make calculation\n\n");
		ch = getch();
		
		if(ch=='q' || ch=='Q') 
			break;
			
		printf("\n\n enter new expression: ");
		scanf("%f %c %f", &left, &oper, &right);

		sum = left + right;
		difference = left - right;
		product = left * right;
		qoutient = left / right;

		if (oper == '+')
			printf("\n Answer: %f ",sum);

		else if (oper == '-')
			printf("\n Anser: %f",difference);

		else if (oper == '*')
			printf("\n Answer: %f",product);

		else if (oper == '/')
			printf("\n Answer: %f",qoutient);

		else
			printf("\n Invalid operator!");

		printf("\n\nPress Return to continue...");
		getch();

	}

	return 0;
}

Code (markup):

regards