实验3

#include 
#include 
#include 
#include 
#define N 80

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

void print_spaces(int n); // 函数声明 

void print_blank_lines(int n); // 函数声明 

int main() {
 int line, col, i;
 char text[N] = "hi, April~";
 
 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;
 col = rand() % 80;
 print_text(line, col, text);
 Sleep(1000); // 暂停1000ms

}
 return 0; 
}

// 打印n个空格 

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

// 打印n行空白行

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

// 在第line行第col列打印一段文本 

void print_text(int line, int col, char text[]) {
 print_blank_lines(line-1); // 打印(line-1)行空行 

 print_spaces(col-1); // 打印(col-1)列空格

 printf("%s", text);// 在第line行、col列输出text中字符串

}

 代码功能：随机生成行和列，打印10次“hi,April~”，每次间隔1000ms

task2-1

#include 
#include
long long fac(int n); // 函数声明

int main() {
    int i, n;

    printf("Enter n: ");
    scanf("%d", &n);

    for (i = 1; i <= n; ++i)
        printf("%d! = %lld\n", i, fac(i));
    system("pause");
    return 0;
}

// 函数定义
long long fac(int n) {
    static long long p = 1;

    p = p * n;

    return p;
}

 

#include 
#include
long long fac(int n); // 函数声明

int main() {
    int i, n;

    printf("Enter n: ");
    scanf("%d", &n);

    for (i = 1; i <= n; ++i)
        printf("%d! = %lld\n", i, fac(i));
    system("pause");
    return 0;
}

// 函数定义
long long fac(int n) {
    static long long p = 1;

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

 task 2-2

#include 
#include
int func(int, int); // 函数声明

int main() {
 int k = 4, m = 1, p1, p2;
 p1 = func(k, m); // 函数调用

 p2 = func(k, m); // 函数调用

 printf("%d, %d\n", p1, p2);
 system("pause");
 return 0;
}

// 函数定义

int func(int a, int b) {
 static int m = 0, i = 2;
 i += m + 1;
 m = i + a + b;
 return m;
}

 stastic:变量的值保留上一次调用的值

task 3

#include 

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

 task 4

#include 
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 i,up=1,down=1,ans;
    if(n>m && m!=0)
         {for(i=n-m+1;i<=n;i++)
              up=up*i;
          for(i=1;i<=m;i++)
              down=down*i;
          ans=up/down;}
    if(n==m)
        ans=1;
    if(n<m)
        ans=0;
    if(m==0)
        ans=1;
    return ans;
}

 

#include 
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 i,ans;
    if(n==m)
        ans=1;
    if(n<m)
        ans=0;
    if(m==0)
        ans=1;
    if(n>m &&m!=0)
        ans=func(n-1,m)+func(n-1,m-1);
    return ans;
}

 task 5

# include < stdio.h>
# include < stdlib.h>
# include  
void hanoi(unsigned int n, char from, char temp,char to);
void moveplate(unsigned int n, char from, char to);

int main()
{
    unsigned int n;
    int    i;
    while((scanf("%u",&n)!=EOF))
    {
        hanoi(n,'A','B','C');
        i=pow(2.0,n*1.0)-1;
        printf("一共移动了%d次\n",i);
    }
    return 0;
}
void hanoi(unsigned int 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 int n, char from, char to)
{
    printf("%u:%c-->%c\n",n,from,to);
    
}

 task 6

#include 
#include 
long func(long s);   // 函数声明

int main()
{

    long s, t;

    printf("Enter a number: ");
    while (scanf("%ld", &s) != EOF) {
        t = func(s); // 函数调用
        printf("new number is: %ld\n\n", t);
        printf("Enter a number: ");
    }

    return 0;
}
long func(long s)
{
    int a,b=0,i=1;
    long ans;
    while(s!=0)
        {
            a=s%10;
            if(a%2!=0&&a!=0)
               {
                   b=pow(10.0,i-1)*a+b;
                   i=i+1;
               }
            s=s/10;

         }
    return b;
}