2024年12月完成（补充提交）

Chapter 2/2-5.cpp

@@ -0,0 +1,50 @@
+#include<iostream>
+int main()
+{
+	std::cout << "输入正方形的边长:";
+	float a, b, c, d;
+	std::cin >> a;
+	std::cout << "输入长方形的长和宽:";
+	std::cin >> b >> c;
+	std::cout << "输入三角形的高:";
+	std::cin >> d;
+
+	std::cout << "正方形:" << std::endl;
+	for (int i = 0; i < a; i++) {
+		for (int j = 0; j < a; j++) {
+			if (i == a - 1 || i == 0 || j == a - 1 || j == 0) {
+				std::cout << "*";
+			}
+			else {
+				std::cout << " ";
+			}
+		}
+		std::cout << std::endl;
+	}
+
+	std::cout << "长方形:" << std::endl;
+	for (int i = 0; i < c; i++) {
+		for (int j = 0; j < b; j++) {
+			if (i == c - 1 || i == 0 || j == b - 1 || j == 0) {
+				std::cout << "*";
+			}
+			else {
+				std::cout << " ";
+			}
+		}
+		std::cout << std::endl;
+	}
+
+	std::cout << "三角形:" << std::endl;
+	for (int i = 0; i < d; i++) {
+		for (int j = 0; j <= i; j++) {
+			if (j == 0 || j == i || i == 0 || i == d - 1) {
+				std::cout << "*";
+			}
+			else {
+				std::cout << " ";
+			}
+		}
+		std::cout << std::endl;
+	}
+}

Chapter 2/2-8.cpp

@@ -0,0 +1,13 @@
+#include<iostream>
+
+int main()
+{
+	std::cout << "输入要计算的区间范围:";
+	float a, b, c;
+	c = 1;
+	std::cin >> a >> b;
+	for (float i = a; i < b; i++) {
+		c = i * c;
+	}
+	std::cout << c;
+}