백준으로 C++ 기초 문제 풀기 - 1

 

https://www.acmicpc.net/problem/2438

2438번: 별 찍기 - 1

#include <iostream>

using namespace std;

int main()
{
    int index;

	cin >> index;
	

	for (int i = 0; i < index; i++)
	{
		for (int j = 0; j < i + 1; j++)
		{
			cout << "*";
		}
		cout << endl;
	}
}

 

---

https://www.acmicpc.net/problem/2739

2739번: 구구단

#include <iostream>

using namespace std;

int main()
{
    int dan;

	cin >> dan;
	

	for (int i = 1; i <= 9; i++)
	{
		cout << dan << " * " << i <<  " = " <<  dan * i << endl;
	}
	cout << endl;
}

 

---

https://www.acmicpc.net/problem/2742

2742번: 기찍 N

#include <iostream>

using namespace std;

int main()
{
    int n;

    cin >> n;

    for (int i = n; i > 0; i--) {
        cout << i << "\n";
    }
}

---

https://www.acmicpc.net/problem/2439

2439번: 별 찍기 - 2

#include <iostream>

using namespace std;

int main()
{
    int n;

    cin >> n;

	for (int i = 1; i <= n; i++)
	{
		for (int k = 1; k <= n - i; k++) {
			cout << " ";
		}
		for (int j = 1; j < i + 1; j++) 
		{
			cout << "*";
		}
		cout << "\n";
	}
}

---

https://www.acmicpc.net/problem/2440

2440번: 별 찍기 - 3

#include <iostream>

using namespace std;

int main()
{
    int n;

    cin >> n;

    for (int i = 0; i < n; i++) {
        for (int j = n; j > i; j--) {
            cout << "*";
        }
        cout << "\n";
    }
}

---

https://www.acmicpc.net/problem/2441

2441번: 별 찍기 - 4

#include <iostream>

using namespace std;

int main()
{
    int n;

    cin >> n;

    for (int i = n; i > 0; i--) {
        for (int k = n; k > i; k--) {
            cout << " ";
        }
        for (int j = 0; j < i; j++) {
            cout << "*";
        }
        
        cout << "\n";
    }
}

---

https://www.acmicpc.net/problem/9498

9498번: 시험 성적

#include <iostream>

using namespace std;

int main()
{
    int score;

    cin >> score;

    if (score >= 90) {
        cout << "A";
    }
    else if (score >= 80) {
        cout << "B";
    }
    else if (score >= 70) {
        cout << "C";
    }
    else if (score >= 60) {
        cout << "D";
    }
    else
        cout << "F";
}

---

https://www.acmicpc.net/problem/8393

8393번: 합

#include <iostream>

using namespace std;

int main()
{
    int n;
    int sum = 0;

    cin >> n;

    for (int i = 1; i <= n; i++) {
        sum += i;
    }
    cout << sum;
}

---

https://www.acmicpc.net/problem/1924

1924번: 2007년

#include <iostream>

using namespace std;

int main()
{
    int month;
    int day;

    int daysOfMonth[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
    string days[7] = { "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT" };

    cin >> month >> day;

    for (int i = 1; i < month; i++) {
        day += daysOfMonth[i];
    }
    cout << days[day % 7];
}

---

 

https://www.acmicpc.net/problem/10871

10871번: X보다 작은 수

#include <iostream>

using namespace std;

int main()
{
    int n;
    int x;

    cin >> n >> x;

    int sequence[10000] = {};

    for (int i = 0; i < n; i++) {
        cin >> sequence[i];
    }

    for (int i = 0; i < n; i++) {
        if (sequence[i] < x) {
            cout << sequence[i] << " ";
        }
    }
}