💻補足のソースたち

#include <iostream>
#include <vector>
#include <iomanip> // std::setprecision
// 関数のプロトタイプ宣言
float getAverage(float score[], int num); //平均値を計算して返す
char getRank(float score[], int num); //80点以上→A、60点以上→B、40点以上→C、それ以下→D
 
int main() {
	//std::vector<double> scores(3); //(N)ってやればN個の要素を持つ配列が作れる
	float scores[3];
	std::cout << "3科目の点数を入力してください（例: 80 70 90）> ";
	for (int i = 0;i < 3; i++) 
		std::cin >> scores[i];
 
	double avg = getAverage(scores, 3);
	char rank = getRank(scores, 3);
 
	std::cout << std::fixed << std::setprecision(1);//小数点以下1桁まで表示
    std::cout << "平均点: " << avg << " 点" << std::endl << "評価: " << rank << std::endl;
}
 
//関数の定義
float getAverage(float score[3], int num)
{
	double sum = 0;
	for (int i = 0; i < num; ++i) {
		sum += score[i];
	}
	return sum / num;
}
char getRank(float score[3], int num)
{
	float avg = getAverage(score, num);
	if (avg >= 80) {
		return 'A';
	}
	else if (avg >= 60) {
		return 'B';
	}
	else if (avg >= 40) {
		return 'C';
	}
	else {
		return 'D';
	}
}

#include <iostream>
#include <iomanip> // std::setprecision
 
int add(int a, int b) {
	a += 2;
	b += 3;
	return a + b;
}
 
int addPointer(int* a, int* b) {
	*a += 2;
	*b += 3;
	return *a + *b;
}
 
void addPointer2(int a, int b, int* aa, int* bb, int* ans) {
	a += 2;
	b += 3;
	*aa = a;
	*bb = b;
	*ans = a + b;
}
 
int main()
{
	int a = 3, b = 5;
	int newA, newB, newAns;
	addPointer2(a, b, &newA, &newB, &newAns);
	std::cout << "a: " << a << ", b: " << b <<
		", newA: " << newA << ", newB: " << newB <<
		", newAns: " << newAns << std::endl;
	//int ans = add(a, b);
	//int ans = addPointer(&a, &b);
	//std::cout << "a: " << a << ", b: " << b << 
	//	         ", ans: " << ans << std::endl;
 
	return 0;
}

#include <iostream>
#include <string>
 
using std::string;
using std::cin;
using std::cout;
using std::endl;
 
int CountWords(std::string str)
{
	for (int i = 0;i < str.size();i++) {
		cout << str[i] << endl;
	}
	return str.size();
}
 
 
int main()
{
	string inputStr;
	std::cout << "文字列を入力してください: ";
	cin >> inputStr;
	int wordCount = CountWords(inputStr);
	cout << "単語数: " << wordCount << endl;
 
}