Chapter04

struct Student_info {
	std::string name;
	double midterm, final;
	std::vector<double> homework;
};

#include <iomanip>
/*undefined*/ setw (int n);

int main() {
	std::cout << "0123456789 : 인덱스" << std::endl;
	std::cout << std::setw(10);
	std::cout << "0123" << std::endl;
	std::cout << std::setw(10);
	std::cout << "0123\n";				// '\n'까지 포함 너비 10
	std::cout << std::setw(10);
	std::cout << 3.141592 << std::endl;	// 다른 형도 가능
	std::cout << std::setw(10);
	std::cout << "01234567890123\n";

	return 0;
}

#include <iostream>
#include <iomanip>

int main() {
	int i = 1, max = 1000, temp_max, digit = 1, max_width;
	std::string result;

	temp_max = max;
	while (temp_max != 1) {
		temp_max /= 10;
		++digit;
	}
	max_width = 4 * digit + 5;
	std::cout << max_width <<std::endl;
	while (i <= max) {
		result = std::to_string(i) + " * " + std::to_string(i)
				+ " = " + std::to_string(i * i);
		std::cout << std::setw(max_width);
		std::cout << result << std::endl;
		++i;
	}
	return 0;
}

#include <iostream>
#include <iomanip>

int main() {
	double i = 1, max = 4;
	int temp_max;
	int digit = 1, max_width;
	std::streamsize precision = 5;
	std::string result;

	temp_max = (int)max;
	while (temp_max > 9) {
		temp_max /= 10;
		++digit;
	}

	max_width = precision + 1;
	std::cout << max_width <<std::endl;
	while (i <= max) {
		std::cout << std::setw(max_width);
		std::cout << std::setprecision(precision) <<i * i << '\n' << std::endl;
		i = i + 0.005;
	}
	return 0;
}

#include <algorithm>
#include <iostream>
#include <vector>

void prt_str(std::string str) {
	std::cout << str << " ";
}

int main() {
	std::string in, temp;
	std::vector<std::string> answer;
	char 	delimiter = ' ';
	while (getline(std::cin, temp, delimiter) != NULL) {
		answer.push_back(temp);
	}
	std::for_each(answer.begin(), answer.end(), prt_str);
}

#include <iostream>
#include <vector>
#include <functional>

bool is_stoiable(std::string str) {
	size_t i;

	for (i = 0; i < str.size() ; i++) {
		if ((str[i] >= 'A' && str[i] <= 'Z') || (str[i] >= 'a' && str[i] <= 'z'))
			return false;
	}
	return true;
}

int main() {
	std::string temp;
	std::vector<int> answer;
	int sum = 0, num;
	char 	delimiter = ' ';
	while (getline(std::cin, temp, delimiter) != NULL) {
		if (is_stoiable(temp)) {
			std::cout << temp << std::endl;
			num = stoi(temp);
			answer.push_back(num);
		}
	}
	for (int i = 0; i < answer.size(); i++) {
		sum += answer[i];
	}
	std::cout << sum << std::endl;
}