实验三

task 1

//每隔一秒出现一次hi,May~  共10次
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<windows.h>
#define N 80

void printText(int line,int co1,char text[]);  //函数声明
void printspaces(int n);  //函数声明
void printBlinkLines(int n);  //函数声明

int main()
{
    int line,co1,i;
    char text[N] = "hi,May~";
    srand(time(0));  //以当前系统时间作为随机种子
    
    for(i=1;i<=10;++i)
    {
        line=rand()%25;
        co1=rand()%80;
        printText(line,co1,text);
        Sleep(1000);  //暂停1000ms
         
     } 
     return 0;
 } 
 
 //打印n个空格
 void printSpaces(int n)
 {
     int i;
     
     for(i=1;i<=n;++i)
           printf(" ");
  } 
  
//打印n行空白行
void printBlankLines(int n)
{
    int i;
    
    for(i=1;i<=n;++i)
         printf("\n");
 } 
 //在第line行第co1列打印一段文本
 void printText(int line,int co1,char text[])
 {
     printBlankLines(line-1);  //打印n-1行空行
    printSpaces(co1-1);  //打印n-1列空格
    printf("%s",text); 
  } 

 

task2

2.1

#include <stdio.h> 
long long fac(int n); 
int main() 
{ 
    int i, n; 
    printf("Enter n: "); 
    scanf("%d", &n); 
    for (i = 1; i <= n; ++i) printf("%d! = %lld\n", i, fac(i)); 
    return 0; 
}
long long fac(int n) 
{
    static long long p = 1;
    printf("p=%lld\n",p);
    p = p * n; 
    return p; 
}

#include <stdio.h> 
long long fac(int n); 
int main() 
{ 
    int i, n; 
    printf("Enter n: "); 
    scanf("%d", &n); 
    for (i = 1; i <= n; ++i) printf("%d! = %lld\n", i, fac(i)); 
    return 0; 
}
long long fac(int n) 
{
    static long long p = 1;

    printf("p = %lld\n", p);
    p = p * n; 
    return p; 
}

结果一致

2.2

#include <stdio.h> 
int func(int, int); 
int main() 
{ 
    int k = 4, m = 1, p1, p2; 
    p1 = func(k, m); 
    p2 = func(k, m); 
    printf("%d,%d\n", p1, p2); 
    return 0; 
}
int func(int a, int b) 
{ 
    static int m = 0, i = 2;
    i += m + 1; 
    m = i + a + b; 
    return m; 
}

 

task3

#include <stdio.h>
long long fun(int n); 
int main()
{
  int n;
  long long f;
  while (scanf("%d", &n) != 0)
 {
    f = fun(n); 
    printf("n = %d, f = %lld\n", n, f);
 }
  return 0;
}
long long fun(int n)
{
    int s;
    if (n > 1)
        s = 2 * fun(n - 1) +1;
    else if (n == 1)
        s = 1;
    return s;
}

 

task4

#include <stdio.h>
int h(int m);
void hanoi(unsigned n, char from, char temp, char to);  
void moveplate(unsigned n, char from ,char to);  
int main() 
{
    unsigned n;  
    int s;
    while(scanf("%u", &n) != EOF)
     {
       hanoi(n, 'A', 'B', 'C');
      printf("一共移动盘子的次数：%ld",h(n));
     }
      0;
}

void hanoi(unsigned n, char from, char temp, char to) {
    if(n==1)
        moveplate(n, from, to);
    else {
        hanoi(n-1, from , to, temp);
        moveplate(n, from, to);
        hanoi(n-1, temp, from, to); 
    }
}

void moveplate(unsigned n, char from, char to) {
    printf("第%u个盘子: %c --> %c\n", n, from, to);
}
int h(int m)
{
    int s;
    if(m==1)
        s=1;
    else
        s=2*h(m-1)+1;
    return s;
}

 

task5

#include<stdio.h>
#include<math.h>
int is_prime(int a);
int main()
{
    int n, i;
    for (n = 4; n <= 20; n += 2)
    {
        for (i = 2; i <= n ; i++)
        {
            if (is_prime(i) && is_prime(n - i))
            {
                printf("%d=%d+%d\n", n, i, n - i);
                break;
            }
        }
    }
    return 0;
}
int is_prime(int a)
{
    if (a == 2)
        return 1;
    else
    {
        int i = 0;
        for (i = 2; i <= sqrt(a); i++)
        {
            if (a % i == 0)
                return 0;
        }
    }
    return 1;
}

 

task 6

#include<stdio.h>
long fun(long s);
int main()
{
    long s,t;
    printf("Enter a number: ");
    while(scanf("%ld",&s) !=EOF)
    {
        t=fun(s);
        printf("new number is : %ld\n\n",t);
        printf("Enter a number: ");
    }
    return 0;
}
long fun(long s)
{
    int a,b,c,d;
    b=0;d=0;
    while(s)
    {
        a=s%10;
        s/=10;
        if(a%2)
          {b=b*10+a;}
    
    }
    while(b)
    {
        c=b%10;
        b/=10;
        d=d*10+c;
    }
    return d;
}