实验3

#include <stdlib.h>
#include <time.h>
#include <windows.h>
#define N 80

void print_text(int line, int col, char text[]); 
void print_spaces(int n);   
void print_blank_lines(int n); 

int main() {
    int line, col, i;
    char text[N] = "hi, November~";
    
    srand(time(0)); 
    
    for(i = 1; i <= 10; ++i) {
        line = rand() % 25;
        col =  rand() % 80;
        print_text(line, col, text);
        Sleep(1000); 
    }
    
    return 0; 
}


void print_spaces(int n) {
    int i;
    
    for(i = 1; i <= n; ++i)
        printf(" ");
}


void print_blank_lines(int n) {
    int i;
    
    for(i = 1; i <= n; ++i)
        printf("\n");
 } 


void print_text(int line, int col, char text[]) {
    print_blank_lines(line-1);      
    print_spaces(col-1);            
    printf("%s", text);        
}

 任务1：间隔相同时间在随机一行的随机一列输出一段文本。

任务2：

 

 

局部变量static变量会使p的值在每循环一次之后保留上一次循环得到的值；静态局部变量只被初始化一次，下一次运算依据上一次的结果值。 

任务3：

#include <stdio.h>
long long func(int n); // 函数声明

int main() {
    int n;
    long long f;

    while (scanf("%d", &n) != EOF) {
        f = func(n); // 函数调用
        printf("n = %d, f = %lld\n", n, f);
    }

    return 0;
}

long long func(int n)
{   

    if(n==0)
        return 0;
    else
        return 2*func(n-1)+1;
}

 任务4：

 

#include <stdio.h>
int func(int n, int m);

int main() {
    int n, m;

    while(scanf("%d%d", &n, &m) != EOF)
        printf("n = %d, m = %d, ans = %d\n", n, m, func(n, m));
    
    return 0;
}

int func(int n,int m)
{
    int ans,i,p=1,q=1,f=1;
    for(i=1;i<=n;i++)
    {
      p*=i;    
    }
    for(i=1;i<=m;i++)
    {
        q*=i;
    }
    for(i=1;i<=(n-m);i++)
    {
        f*=i;
    }
    ans=p/(q*f);
    
    return ans;
}

 

 

#include <stdio.h>
int func(int n, int m);

int main() {
    int n, m;

    while(scanf("%d%d", &n, &m) != EOF)
        printf("n = %d, m = %d, ans = %d\n", n, m, func(n, m));
    
    return 0;
}

int func(int n, int m)
{    
     if(n<m)
     return 0;
    if(n==m||m==0)
    return 1;
    else
    return func(n-1,m)+func(n-1,m-1);
 } 

任务5：

 

 

#include <stdio.h>
#include<stdlib.h>
void hanoi(unsigned int n,char from,char temp,char to);
void moveplate(unsigned int n,char from,char to);
int bushu;
int main()
{   
    unsigned int n;
    while(scanf("%u",&n)!=EOF)
    {   bushu=0;
        hanoi(n,'A','B','C');
        printf("一共移动了 %d 次\n",bushu);
    }
    return 0;
}
void hanoi(unsigned int n,char from,char temp,char to)
{   bushu++;
    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 int n,char from,char to)
{
    printf("%u:%c-->%c\n",n,from,to);
}

 实验6

 

#include <stdio.h>
#include <math.h>
#define N 100
long func(long s); 
int main() {
   long s, t;
   printf("Enter a number: ");
   while (scanf("%ld", &s) != EOF) {
     t = func(s); 
     printf("new number is: %ld\n\n", t);

      printf("Enter a number: ");
   }
   return 0;
}
long func(long s)
{
    int p;long q=1,sum=0;
    while(s>0)
    { 
      p=s%10;
      s/=10;
      if(p%2!=0)
      {
          sum+=q*p;
          q*=10;
      }    
    }
    return sum;
}