实验3

1.

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

void print_text(int line, int col, char text[]);  // 函数声明
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
}

 

 程序功能：每隔1秒，随机生成一个"hi,April~"，打印的行和列由函数控制，总计打印10个hi April`.

2.

#include <stdio.h>
#include<stdlib.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));
    system("pause");
    return 0;
}
long long fac(int n) {
    static long long p = 1;
    
    p = p * n;

    return p;
}

 

#include <stdio.h>
#include<stdlib.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));
    system("pause");
    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>
#include<stdlib.h>
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;
}

int func(int a, int b) {
    static int m = 0, i = 2;

    i += m + 1;
    m = i + a + b;

    return m;
}

 static变量在运行过程中，不会被重置，前一次运算的值会被保留下来。每次函数被调用时，该变量的值都会被保留下来，而非重置。

3.

#include <stdio.h>
#include<stdlib.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);
    }
    system("pause");
    return 0;
}
long long func(int n)
{
    long long f;
    if(n == 1){
        f = 1;
    }
    else
    {
        f = 2*func(n-1)+1;
    }
    return f;
}

 4.迭代

#include <stdio.h>
#include<stdlib.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));
    system("pause");
    return 0;
}

// 函数定义
int func(int m,int n)
{
    int i, s = 1,k = 1;
    if(m>n)
    {
        return 0;
    }
    else if(m == 0&&n == 0)
    {
        return 1;
    }
    else
    {
        for(i = 1;i<=m;++i)
        {
            s*=n-i+1;
            k*=i;
        }
        return s/k;
    }
}

 递归

#include <stdio.h>
#include<stdlib.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));
    system("pause");
    return 0;
}

// 函数定义
int func(int m,int n)
{
    if(m>n)
    {
        return 0;
    }
    else if(m == n||m == 0)
    {
        return 1;
    }
    else
    {
        int i;
        i = func(n-1,m)+func(n-1,m-1);
        return i;
    }
}

 5.

#include <stdio.h>
#include <math.h>
#include<stdlib.h>
void hanoi(unsigned int n,char from,char temp,char to,int *m);
void moveplate(unsigned int n, char from,char to,int *m);
int main()
{
    unsigned int n;
    while(scanf("%u",&n)!=EOF)
    {
        int m = 0;
        hanoi(n,'A','B','C',&m);
        printf("\n一共移动了%d次\n\n",m);
    }
    system("pause");
    return 0;
}
void hanoi(unsigned int n,char from,char temp,char to,int *m)
{
    if(n == 1)
    
        moveplate(n,from,to,m);
    else
    {
        hanoi(n-1,from,to,temp,m);
        moveplate(n,from,to,m);
        hanoi(n-1,from,temp,to,m);
    }
}
void moveplate(unsigned int n,char from,char to,int *m)
{
    printf("%u:%c-->%c\n",n,from,to);
    (*m)++;
}

 6.

#include <stdio.h>
#include <math.h>
#include<stdlib.h>
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: ");
    }
    system("pause");
    return 0;
}

// 函数定义
long func(long s)
{
    long ans;
    long digit,t;
    ans = 0;
    t = 1;
    while(s != 0)
    {
        digit = s%10;
        if(digit%2)
        {
            ans += t*digit;
            t *= 10;
        }
        s /= 10;
    }
    return ans;
}