# include <stdio.h>

void main(void){
	double FirstNumber, SecondNumber, Answer;
	int Choice;

	printf("Enter first number: ");
	scanf("%lf",& FirstNumber);

	printf("Enter second number: ");
	scanf("%lf",& SecondNumber);


	do {
		printf("Choose one of the following: \n");
		printf("1. Add \n");
		printf("2. Subtract \n");
		printf("3. Multiply \n");
		printf("4. Divide \n");
	
		scanf("%d", &Choice);
	
		switch (Choice){
		case 1:
			Answer = FirstNumber + SecondNumber;
			printf(" Sum is %f\n",Answer);
			break;
		case 2:
			Answer = FirstNumber - SecondNumber;
			printf(" Difference is %f\n",Answer);
			break;
		case 3:
			Answer = FirstNumber * SecondNumber;
			printf(" Product is %f\n",Answer);
			break;
		case 4:
			Answer = FirstNumber / SecondNumber;
			printf(" Division is %f\n",Answer);
			break;
		default:
			printf(" Invalid choice\n");
		}
	}
	while (Choice<1 || Choice > 5);

}