구구단 (for문, while문)

# for문

#include <iostream>
using namespace std;

int main() {
	int start, end;

	cout << "구구단 for문" << endl;

	cout << "시작 단을 입력하세요 >> ";
	cin >> start;

	cout << "끝 단을 입력하세요 >> ";
	cin >> end;


	if (start > end) {
		int tmp = start;
		start = end;
		end = tmp;
	}

	for (int i = 1; i <= 9; i++) {
		for (int j = start; j <= end; j++) {
			cout << j << "*" << i << "=" << i * j << "\t";
		}
		cout << endl;
	}
}

 

 

# while문

#include <iostream>
using namespace std;

int main() {
	int start, end;

	cout << "구구단 while문" << endl;

	cout << "시작 단을 입력하세요 >> ";
	cin >> start;

	cout << "끝 단을 입력하세요 >> ";
	cin >> end;


	if (start > end) {
		int tmp = start;
		start = end;
		end = tmp;
	}

	int i = 1;
	while (i <= 9) {
		int j = start;
		while (j <= end) {
			cout << j << "*" << i << "=" << i * j << "\t";
			j++;
		}
		cout << endl;
		i++;
	}
}