1.4 입출력 스트림(cin, cout) / 1.5 함수 / 1.6 키워드와 식별자 이름

1.4 입출력 스트림(cin, cout)

#include <iostream> //cout, cin, endl
#include <cstdio> //printf

int main() {

	int x = 1;
	std::cin >> x;
	float pi = 3.14;
	std::cout << "I love this lecture!\n";
	std::cout << "x is " <<  x << std::endl << "pi is " << pi << std::endl;

	return 0;
}

 

using namespace std;를 작성할 경우, std::을 생략해줘도 된다!

 

1.5 함수

#include <iostream> //cout, cin, endl

using namespace std;

int multiplyTwoNumbers(int num_a, int num_b) {
	int sum = num_a * num_b;
	return sum;
}

int main() {
	cout << multiplyTwoNumbers(1,2) << endl;
	cout << multiplyTwoNumbers(3,4) << endl;
	cout << multiplyTwoNumbers(8,13) << endl;

	return 0;
}