terminal/calculator.c

#include <stdio.h>
#include <stdlib.h>

enum calculator_state {
		NUMBER_FIRST,
	NUMBER_SECOND,
	RESULT
};
enum calculator_op {
	NO_OP,
	ADD,
	SUB,
	DIV,
	MUL
};
struct calculator {
	// 1 ÷čńëî
	int num1;
	// 2 ÷čńëî
	int num2;
	// 3 îďĺđŕöč˙
	enum calculator_op operation;
	// 4 đĺçóëüňŕň
	int result;
	// 5 ńîńňî˙íčĺ ŕňîěŕňŕ
	enum calculator_state state;
};



int main() {
	struct calculator calc;
	calc.state = NUMBER_FIRST;
	calc.operation = NO_OP;
	calc.num1 = 0;
	calc.num2 = 0;
	calc.result = 0;
	int input;
	while (1) {
		scanf("%d", &input);
		switch (calc.state) {
			case NUMBER_FIRST:
			switch (input) {
				case 0:
				calc.num1 = (calc.num1 * 10) + 7;
				break;
				case 1:
				calc.num1 = (calc.num1 * 10) + 8;
				break;
				case 2:
				calc.num1 = (calc.num1 * 10) + 9;
				break;
				case 3:
				calc.operation = DIV;
				calc.state = NUMBER_SECOND;
				break;
				case 4:
				calc.num1 = (calc.num1 * 10) + 4;
				break;
				case 5:
				calc.num1 = (calc.num1 * 10) + 5;
				break;
				case 6:
				calc.num1 = (calc.num1 * 10) + 6;
				break;
				case 7:
				calc.operation = MUL;
				calc.state = NUMBER_SECOND;
				break;
				case 8:
				calc.num1 = (calc.num1 * 10) + 1;
				break;
				case 9:
				calc.num1 = (calc.num1 * 10) + 2;
				case 10:
				calc.num1 = (calc.num1 * 10) + 3;
				break;
				case 11:
				calc.operation = SUB;
				calc.state = NUMBER_SECOND;
				break;
				case 12:
				calc.num1 = 0;
				break;
				case 13:
				calc.state = NUMBER_FIRST;
				calc.operation = NO_OP;
				calc.num1 = 0;
				calc.num2 = 0;
				calc.result = 0;
				break;
				case 14:
				break;
				case 15:
				calc.operation = ADD;
				calc.state = NUMBER_SECOND;
				break;
			}
			printf("num1: %d | num2: %d | result: %d | operation: %d | state: %d", calc.num1, calc.num2, calc.result, calc.operation, calc.state);
			break;

			case NUMBER_SECOND:
			switch (input) {
				case 0:
				calc.num2 = (calc.num2 * 10) + 7;
				break;
				case 1:
				calc.num2 = (calc.num2 * 10) + 8;
				break;
				case 2:
				calc.num2 = (calc.num2 * 10) + 9;
				break;
				case 3:
				break;
				case 4:
				calc.num2 = (calc.num2 * 10) + 4;
				break;
				case 5:
				calc.num2 = (calc.num2 * 10) + 5;
				break;
				case 6:
				calc.num2 = (calc.num2 * 10) + 6;
				break;
				case 7:
				break;
				case 8:
				calc.num2 = (calc.num2 * 10) + 1;
				break;
				case 9:
				calc.num2 = (calc.num2 * 10) + 2;
				case 10:
				calc.num2 = (calc.num2 * 10) + 3;
				break;
				case 11:
				break;
				case 12:
				calc.num2 = 0;
				break;
				case 13:
				calc.state = NUMBER_FIRST;
				calc.operation = NO_OP;
				calc.num1 = 0;
				calc.num2 = 0;
				calc.result = 0;
				break;
				case 14:
				switch (calc.operation) {
					case ADD:
					calc.result = calc.num1 + calc.num2;
					calc.state = RESULT;
					break;
					case SUB:
					calc.result = calc.num1 - calc.num2;
					calc.state = RESULT;
					break;
					case MUL:
					calc.result = calc.num1 * calc.num2;
					calc.state = RESULT;
					break;
					case DIV:
					calc.result = calc.num1 / calc.num2;
					calc.state = RESULT;
					break;

				}
				break;
				case 15:
				break;
			}
			printf("num1: %d | num2: %d | result: %d | operation: %d | state: %d", calc.num1, calc.num2, calc.result, calc.operation, calc.state);
			break;
			case RESULT:
			switch (input) {
				case 14:
				calc.state = NUMBER_FIRST;
				calc.operation = NO_OP;
				calc.num1 = 0;
				calc.num2 = 0;
				calc.result = 0;
				printf("num1: %d | num2: %d | result: %d | operation: %d | state: %d", calc.num1, calc.num2, calc.result, calc.operation, calc.state);
				break;
			}
			break;

		}
	}
}