作业

level1/p01_runningLetter/runningLetter.cpp

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <windows.h>
+
+int GetWidth()
+{
+	CONSOLE_SCREEN_BUFFER_INFO scr;
+	HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
+	GetConsoleScreenBufferInfo(hOut, &scr);
+	return scr.dwMaximumWindowSize.X;
+}
+
+int main()
+{
+	int i = 0, width = GetWidth();
+	while (1)
+	{
+		while (i <= width-2)
+		{
+			for (int j = 0; j < i; ++j)
+			{
+				printf(" ");
+			}
+			printf("p");
+			Sleep(20);
+			system("cls");
+			++i;
+		}
+		while (i >= 0)
+		{
+			for (int j = 0; j < i; ++j)
+			{
+				printf(" ");
+			}
+			printf("p");
+			Sleep(20);
+			system("cls");
+			--i;
+		}
+	}
+}

level1/p02_isPrime/isPrime.cpp

@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+int main()
+{
+	int n = 0;
+	scanf_s("%d", &n);
+	int Isprime = 1;
+	for (int j = 2; j <= n / 2; j++)
+	{
+		if (n % j  == 0)
+		{
+			Isprime = 0;
+			break;
+		}
+	}
+	if (n == 1)
+	{
+		printf("%d��������", n);
+	}
+	else
+	{
+		if (Isprime == 1)
+		{
+			printf("%d������", n);
+		}
+		if (Isprime == 0)
+		{
+			printf("%d��������", n);
+		}
+	}
+}

level1/p03_Diophantus/Diophantus.cpp

@@ -0,0 +1,16 @@
+#include<stdio.h>
+
+int main()
+{
+	float Diophantus_age = 1;
+	for (Diophantus_age = 1; 1; Diophantus_age++)
+	{
+
+		if (Diophantus_age / 12 + Diophantus_age / 6 + Diophantus_age / 7 + 5 + Diophantus_age / 2 + 4 == Diophantus_age)
+		{
+			break;
+		}
+	}
+	printf("%d", (int)Diophantus_age-4);
+	return 0;
+}

level1/p03_Diophantus/README.md

@@ -12,6 +12,6 @@
 
 儿子比父亲先死四年，
 
-年级是他的一半。
+年纪是他的一半。
 
 问儿子死时丢番图多大？

level1/p04_ narcissus/narcissus.cpp

@@ -0,0 +1,19 @@
+#include<stdio.h>
+
+int main()
+{
+	for (int i = 1; i < 10; i++)
+	{
+		for (int j = 0; j < 10; j++)
+		{
+			for (int k = 0; k < 10; k++)
+			{
+				if (i * i * i + j * j * j + k * k * k == 100 * i + 10 * j + k)
+				{
+					printf("%d\n", 100 * i + 10 * j + k);
+				}
+			}
+		}
+	}
+	return 0;
+}

level1/p05_allPrimes/allPrime.cpp

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <time.h>
+
+int main()
+{
+	int i = 2;
+	int IsPrime = 1;
+	clock_t start, finish;
+	double Total_time;
+	start = clock();
+	for (i = 2; i <= 1000; i++)
+	{
+		IsPrime = 1;
+		for (int j = 2; j <= i / 2; j++)
+		{
+			if (i % j == 0)
+			{
+				IsPrime = 0;
+				break;
+			}
+		}
+		if (IsPrime == 1)
+		{
+			printf("%d\n", i);
+		}
+	}
+	finish = clock();
+	Total_time = (double)(finish - start) / CLOCKS_PER_SEC;
+	printf("%f seconds\n", Total_time);
+}

level1/p06_Goldbach/Goldbach.cpp

@@ -0,0 +1,59 @@
+#include<stdio.h>
+
+int main()
+{
+	int i = 2;
+	int IsPrime = 1;
+	int a[50] = { 0 };
+	int k = 0;
+	for (i = 2; i <= 100; i++)
+	{
+		IsPrime = 1;
+		for (int j = 2; j <= i / 2; j++)
+		{
+			if (i % j == 0)
+			{
+				IsPrime = 0;
+				break;
+			}
+		}
+		if (IsPrime == 1)
+		{
+			a[k] = i;
+			k++;
+		}
+	}
+	int sum = 0;
+	int h = 4;
+	for (h = 4; h <= 100; h = h + 2)
+	{
+		int s = 1;
+		for (int x = 0; x < k; x++)
+		{
+			for (int y = 0; y <= x; y++)
+			{
+				if (a[x] + a[y] == h)
+				{
+					s = 0;
+					break;
+				}
+			}
+			if (s == 0)
+			{
+				break;
+			}
+		}
+		if (s == 0)
+		{
+			sum++;
+		}
+	}
+	if (sum == 49)
+	{
+		printf("��°ͺղ�����100��Χ������ȷ��");
+	}
+	else
+	{
+		printf("��°ͺղ�����100��Χ�ڲ�����ȷ��");
+	}
+}

level1/p07_encrypt_decrypt/encrypt_decrypt.cpp

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+#include <iostream>
+
+void encrypt(char* source, char* encrypted)
+{
+	while (*source != '\0')
+	{
+		*encrypted = 158 - *source;
+		source++;
+		encrypted++;
+	}
+}
+
+void decrypt(char* encrypted, char* source)
+{
+	while (*encrypted != '\0')
+	{
+		*source = 158 - *encrypted;
+		source++;
+		encrypted++;
+	}
+}
+
+int main()
+{
+	printf("��������Ҫ�����ַ����ij��ȣ�");
+	int n = 0;
+	std::cin >> n;
+	char* a = new char[n + 1]();
+	char* b = new char[n + 1]();
+	scanf("%s", a);
+	encrypt(a, b);
+	printf("���ܺ���ַ���Ϊ��");
+	printf("%s\n", b);
+	printf("��������Ҫ���ܵ��ַ����ij��ȣ�");
+	int s = 0;
+	scanf("%d", &s);
+	char* c = new char[n + 1]();
+	char* d = new char[n + 1]();
+	printf("��Ҫ���ܵ��ַ���Ϊ��");
+	scanf("%s", c);
+	decrypt(c, d);
+	printf("���ܺ���ַ���Ϊ��");
+	printf("%s", d);
+}

level1/p08_hanoi/hanoi.cpp

@@ -0,0 +1,22 @@
+#include<iostream>
+
+void hanoi(int n, char a, char b, char c)
+{
+	if (n == 1)
+	{
+		printf("��Բ��%d��%c�Ƶ�%c", n, a, c);
+	}
+	else
+	{
+		hanoi(n - 1, a, c, b);
+		printf("��Բ��%d��%c�Ƶ�%c", n, a, c);
+		hanoi(n - 1, b, a, c);
+	}
+}
+int main()
+{
+	char A = 'A';
+	char B = 'B';
+	char C = 'C';
+	hanoi(64, A, B, C);
+}