实验三

TASK 1

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#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
	}
	system("pause");
	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
}


TASK 2

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// 利用局部static变量的特性，计算阶乘

#include <stdio.h>
#include<stdlib.h>
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;
}


点击查看代码

// 利用局部static变量的特性，计算阶乘

#include <stdio.h>
#include<stdlib.h>
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;
    printf("p=%11d\n",p);
    p = p * n;
    return p;
}


TASK 2_2

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#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;
}

 TASK3

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#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){
int i,s=1;
if(n==0)
s=1;
for(i=1;i<=n;i++)
s=s*2;
s=s-1;
if(n==0)
return s;
else
return 2*func(n-1)+1;
}

 TASK 4 迭代

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#include <stdio.h>
#include <stdlib.h>
#include <math.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;
}
int func(int n, int m){
if (m > n) {
return 0;
}

int result = 1;
int denominator = 1;

for (int i = 1; i <= m; i++) {
result *= n;
result /= denominator;
n--;
denominator++;
}

return result;
}

 递归

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#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 n, int m)
{
    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;
    }
}

 TASK 5

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#include <stdio.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_s("%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, temp, from, to, m);
    }
}
void moveplate(unsigned int n, char from, char to, int* m)
{
    printf("%u:%c --> %c\n", n, from, to);
    (*m)++;
}

 TASK 6

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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
long func(long s);
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;
}
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;
}