[C++][BOJ/백준][단계별로 풀어보기] 1. 입출력과 사칙연산

1. (2577번) Hello World

#include <iostream>

int main()
{
    std::cout << "Hello World!" << std::endl;
    
    return 0;
}

2. (10718번) We love kriii

#include <iostream>
using namespace std;

int main()
{
    std::cout << "강한친구 대한육군" << endl;
    std::cout << "강한친구 대한육군" << endl;
    
    return 0;
}

5. (1000번) A+B

#include <iostream>
using namespace std;


int main() 
{
 int A, B;
 cin >> A >> B;
 cout << A + B;

 return 0;
}

6. (1001번) A-B

#include <iostream>
using namespace std;

int main() 
{
 int A, B;
 cin >> A >> B;
 cout << A - B;

 return 0;
}

7. (10998번) A*B

#include <iostream>
using namespace std;


int main() 
{
 int A, B;
 cin >> A >> B;
 cout << A * B;

 return 0;
}

8. (1008번) A/B

#include <iostream>
using namespace std;


int main() 
{
 int A, B;
 cin >> A >> B;
 cout.precision(10);
 cout << (double)A + B;

 return 0;
}

9. (10869번) 사칙연산

#include <iostream>
using namespace std;

int main() 
{
 int A, B;
    cout << A+B << endl;
    cout << A-B << endl;
    cout << A*B << endl;
    cout << A/B << endl;
    cout << A%B << endl;
    
 return 0;
}

10. (10430번) 나머지

#include <iostream>
using namespace std;

int main()
{
    int A, B, C;
    cin >> A >> B >> C;
    cout << (A+B)%C << endl;
    cout << (A%C + B%C)%C << endl;
    cout << (A*B%C) << endl;
    cout << (A%C * B%C)%C << endl;
    
    return 0;
}

11. (2588번) 곱셈

#include <iostream>
#include <string>

using namespace std;

int main()
{
	int A;
	string B;
	
	cin >> A >> B;
	cout << A*(B[2] - '0')<< endl;
	cout << A*(B[1] -'0') << endl;
	cout << A*(B[0] -'0') << endl;
	cout << A * stoi(B) << endl;
	
	return 0;
	
}