交作业啦

level1/p01_runningLetter/running letter.cpp

@@ -0,0 +1,38 @@
+#include<stdio.h>
+#include<windows.h>
+int main()
+{
+    int m = 10;
+    while (1)
+    {
+        for (int n = 0; n < m; n++)
+        {
+            for (int i = 0; i <= n; ++i)
+            {
+                printf("\n");
+            }
+            for (int i = 0; i <= n; ++i)
+            {
+                printf(" ");
+            }
+            printf("H");
+            Sleep(100);
+            system("cls");
+        }
+        for (int n = m; n > 0; n--)
+        {
+
+            for (int i = 0; i <= n; ++i)
+            {
+                printf("\n");
+            }for (int i = 0;i<=n; ++i)
+            {
+                printf(" ");
+            }
+            printf("H");
+            Sleep(100);
+            system("cls");
+        }
+    }
+    return 0;
+}

level1/p02_isPrime/isPrime.cpp

@@ -0,0 +1,27 @@
+#include<stdio.h>
+#include<math.h>
+int main()
+{
+	int n,flag=0;
+	scanf("%d", &n);
+	if (n == 2||n==1)
+		printf("yes\n");
+	else
+		{
+			for (int i=2; i <=sqrt(n); i++)
+		{
+			if (n % i == 0)
+			{
+				flag = 1;
+				break;
+			}
+
+		}
+			if (flag == 1)
+				printf("no\n");
+			else
+				printf("yes\n");
+		}
+
+	return 0;
+}

level1/p03_Diophantus/Diophantus.cpp

@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main()
+{
+    for(int i=1;i<100;++i)
+    {
+        if(i/2==i-(1.0/6*i+1.0/12*i+1.0/7*i+5+4))
+        {
+            printf("%d",i);
+            break;
+        }
+    }
+    return 0;
+}

level1/p04_ narcissus/narcissus.cpp

@@ -0,0 +1,14 @@
+#include<stdio.h>
+int main()
+{
+	for (int i = 100; i <= 999; ++i)
+	{
+		int a = i / 100;
+		int b = i / 10 % 10;
+		int c = i % 10;
+		if (i ==a*a*a+b*b*b+c*c*c)
+			printf("%d\t", i);
+
+	}
+	return 0;
+}

level1/p05_allPrimes/prime.cpp

@@ -0,0 +1,19 @@
+#include<stdio.h>
+#include<math.h>
+int main()
+{
+	printf("2\t");
+	for (int i = 3; i <= 1000; ++i)
+	{
+		int k = 0;
+		for (int j = 2; j <= sqrt(i); ++j)
+		{
+			if (i % j == 0)
+				k = 1;
+
+		}
+		if (k == 0)
+			printf("%d\t", i);
+
+	}
+}

level1/p06_Goldbach/Goldbach.cpp

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <math.h>
+int isPrime(int x)
+{
+    int flag=1;
+	if(x>2)
+    {
+        for(int i=2;i<x;++i)
+        {
+            if(x%i==0) {
+                flag = 0;
+                break;
+            }
+        }
+    }
+    return flag;
+}
+
+int main()
+{
+    for(int i=4;i<=100;i=i+2)
+    {
+        for(int j=2;j<i;++j)
+        {
+            if(isPrime(j)==1)
+            {
+                if(isPrime(i-j)==1)
+                {
+                    printf("%d=%d+%d",i,j,i-j);
+                    //printf("\t");
+                    break;
+                }
+            }
+        }
+        printf("\n\n");
+    }
+    return 0;
+}

level1/p07_encrypt_decrypt/encrypt_decrypt.cpp

@@ -0,0 +1,68 @@
+#include<stdio.h>
+#include<string.h>
+#include<windows.h>
+void crypt(int m)
+{
+	char text[256] = { '\0' }, text1[256] = { '\0' };
+	if (m == 0)
+	{
+		printf("enter the words you want to encrypt:\n");
+		scanf("%s", text);
+		for (int i = 0; i <= int(sizeof(text)); i++)
+		{
+			if ((text[i] >= 'a' && text[i] <= 'z' )||( text[i] >= 'A' && text[i] <= 'Z'))//uvwxyz
+			{
+				if ((text[i] >= 'a' && text[i] <= 'u' )||( text[i] >= 'A' && text[i] <= 'U'))
+				{
+					text1[i] = text[i] + 5;
+				}
+				else
+				{
+					text1[i] = text[i] + 5 - 26;
+				}
+			}
+
+		}
+		printf("%s-->%s", text, text1);
+	}
+	else if (m == 1)
+	{
+		printf("enter the words you want to decrypt:\n");
+		scanf("%s", text);
+		for (int i = 0; i <= int(sizeof(text)); i++)
+		{
+			if ((text[i] >= 'a' && text[i] <= 'z' )||( text[i] >= 'A' && text[i] <= 'Z'))//uvwxyz
+			{
+				if ((text[i] >= 'e' && text[i] <= 'z' )||( text[i] >= 'E' && text[i] <= 'Z'))
+				{
+					text1[i] = text[i] - 5;
+				}
+				else
+				{
+					text1[i] = text[i] -5+26;
+				}
+			}
+
+		}
+		printf("%s<--%s", text, text1);
+	}
+	else
+	{
+		printf("error");
+	}
+}
+
+int main()
+{
+	int m;
+	printf("press 0 to encrypt , press 1 to decrypt, press 2 to end the exe\n");
+	scanf("%d", &m);
+	while(m!=2)
+	{
+		crypt(m);
+		//system("cls");
+		printf("\npress 0 to encrypt , press 1 to decrypt, press 2 to end the exe\n");
+		scanf("%d", &m);
+	}
+	return 0;
+}

level1/p08_hanoi/hanio of function pointer.cpp

@@ -0,0 +1,36 @@
+#include<stdio.h>
+int main()
+{
+	int n;
+	char A='A',B='B',C='C';
+	printf("enter the number of plate you want to move:\n");
+	void hanio(int n,char a,char b,char c);
+	scanf("%d",&n);
+	hanio(n,A,B,C);
+	return 0;
+}
+
+
+void hanio(int n,char a,char b,char c)
+{
+	void move(char a,char b);
+	void(*p)(char,char);
+	void(*q)(int,char,char,char);
+	q=hanio;
+	p=move;
+	if(n==1)
+	{
+		(*p)(a,c);
+	}
+	else
+	{
+		(*q)(n-1,a,c,b);
+		(*p)(a,c);
+		(*q)(n-1,b,c,a);
+	}
+} 
+
+void move(char a,char b)
+{
+	printf("%c -> %c\n",a,b);
+}

level1/p08_hanoi/hanio.cpp

@@ -0,0 +1,32 @@
+#include<stdio.h>
+int main()
+{
+    int n;
+    char A='A',B='B',C='C';
+    printf("enter the number of plate you want to move:\n");
+    void hanio(int n,char a,char b,char c);
+    scanf("%d",&n);
+    hanio(n,A,B,C);
+    return 0;
+}
+
+
+void hanio(int n,char a,char b,char c)
+{
+    void move(char a,char b);
+    if(n==1)
+    {
+        move(a,c);
+    }
+    else
+    {
+        hanio(n-1,a,c,b);
+        move(a,c);
+        hanio(n-1,b,c,a);
+    }
+}
+
+void move(char a,char b)
+{
+    printf("%c -> %c\n",a,b);
+}