#include <stdio.h>
/*Ofek Gur 322692641 ex1b.c*/
void calculate(int num1, int num2, char operation) {
	/*calculator function - with the switch and the operation chooses which case to run*/
	switch (operation) {
	case '+':
		printf(" %d + %d = %d \n",num1,num2,num1 + num2);
		break;
	case '-':
		printf(" %d - %d = %d \n", num1, num2, num1-num2);
		break;
	case '*':
		printf(" %d * %d = %d \n", num1, num2, num1*num2);
		break;
	case '%':
		// can't show %
		printf(" %d mod %d = %d \n", num1, num2, num1%num2);
		break;
	case '/':
		printf(" %d / %d = %d \n", num1, num2, num1 / num2);
		break;
		// operation is not right
	default:
		printf("Input error\n");
	}
}

void seven_boom(int num1) {
	printf("[");
	int tmp;
	for (int i = 7; i <= num1; i++) {
		//number divided by 7
		if (i % 7 == 0)
			//the first number has no commas
			if (i == 7)
				printf("%d",i);
			else
			    printf(",%d",i);
		else
		{
			//checking if 7 appears in the number by dividing by 10 and checking mod 10
			tmp = i;
			while (tmp >=7) {
				if (tmp % 10 == 7)
					printf(",%d", i);
					tmp /= 10;
			}

		}

	}
	printf("] \n ");
}

int main() {
	int option=0;
	int num1, num2;
	char operation;
	while(1) {
		//The menu - showing the options to the user
		printf("Choose an option \n 1.Calculator \n 2.7 Boom \n 3.Number with decimal point \n 4.exit \n");
		scanf_s("%d",&option);
		getchar();
		switch (option)
		{
		case 1:
			// Calculator
		{
			printf("Please enter two numbers\n");
			scanf_s(" %d %d", &num1, &num2);
			printf("Please enter operation \n");
			scanf_s(" %c", &operation);
			if (operation == '/'&&num2 == 0)
				printf("Error\n");
			else
				calculate(num1, num2, operation);
			break;
		}
		case 2:
			//7 Boom
		{
			printf("Please enter a number for 7 Boom game \n");
			scanf_s(" %d", &num1);
			seven_boom(num1);
			break;
		}
		case 3:
		//Number with decimal point
		{
			int sum1=0,sum2 = 0;
			char decimal_number;
			printf("Please enter a real number\n");
			scanf_s("%c", &decimal_number);
			if (decimal_number == '.') {
				char temp = decimal_number;
				scanf_s("%c", &temp);
				if (temp == 10) {
					printf("Input error \n");
					break;
				}
			}
			if (decimal_number == '-')
				scanf_s("%c", &decimal_number);
			if (decimal_number == '.'|| decimal_number >= '0' && decimal_number <= '9') {
				while (1) {
					if (decimal_number >= '0' && decimal_number <= '9')
						sum1 += decimal_number - 48;
					if (decimal_number == '.' || decimal_number == 10)
						break;
					if ((decimal_number < '0' || decimal_number > '9'))
					{
						printf("Input error\n");
						break;
					}
				scanf_s("%c", &decimal_number);
				}
				if ((decimal_number < '0' || decimal_number>'9')&&decimal_number!='.'&&decimal_number!=10)
					break;
				if (decimal_number != 10) {
					while (1) {
						scanf_s("%c", &decimal_number);
						if (decimal_number >= '0' && decimal_number <= '9')
							sum2 += decimal_number - 48;
						if (decimal_number == 10)
							break;
						if ((decimal_number < '0' || decimal_number>'9'))
						{
							printf("Input error\n");
							break;
						}
					}
				}
				if ((decimal_number < '0' || decimal_number>'9') && decimal_number != 10)
					break;
				printf("%d.%d \n", sum1, sum2);
			}
			else
				printf("Input error\n");
			break;
		}
		case 4:
			//exit
			printf("Bye\n");
			return 0;

		default:
			printf("Input error\n");
			break;

		}
	}
}