实验3

实验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
}

实验2

代码

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

总结fun是算阶乘用的stastic就可以累加不用重复算。

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

 实验4

代码

#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 || n < 0 || m < 0) return 0;
    if (m == 0 || m == n) return 1;
    return func(n-1, m) + func(n-1, m-1);



}

 实验5.1

#include <stdio.h>
#include<stdlib.h>
#include<math.h>
double mypow(int x,int y);

int main ()
{int x,y;
double ans;
while(scanf("%d%d",&x,&y)!=EOF)
{ans=mypow(x,y);
printf("%d的%d次方： %g\n\n",x,y,ans);
}	
	system ("pause");
	return 0;

}
double mypow(int x,int y)
{
	double ans=1.0;
	double t;
	int i=0;
	for(i=0;i<abs(y);i++)
	{if(y>=0)
		ans*=x;
	else {t=x;
		ans*=1/t;}
	}
	return ans;

}

#include <stdio.h>
#include<stdlib.h>
double mypow(int x,int y);

int main ()
{int x,y;
double ans;
while(scanf("%d%d",&x,&y)!=EOF)
{ans=mypow(x,y);
printf("%d的%d次方： %g\n\n",x,y,ans);
}	
	system ("pause");
	return 0;

}
double mypow(int x,int y)
{
	double ans=1.0;
	double t;
	int i=0;
	if(y==0)
		ans=1;
	else if(y>0)
		ans=mypow(x,y-1)*x;
	else ans=1/mypow(x,-y);
	
	return ans;

 实验6

 #include <stdio.h>

#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 tot;

int main() {
    unsigned int n;
    while (scanf("%u", &n) != EOF) {
        tot = 0;
        hanoi(n, 'A', 'B', 'C');
        printf("一共移动了%d次\n", tot);}
    system("pause");
    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) {
    tot ++;
    printf("%u:%c-->%c\n", n, from, to);
}

实验7

#include<stdio.h>
int is_prime(int x);

int main() {
    int i, n;
    while (scanf("%d", &n) != EOF) {
        for (i = 2; i <= n; i++) {
            if (!is_prime(i) || !is_prime(n - i))continue;
            printf("%d = %d + %d\n", n, i, n - i);
            break;
        }
    }
    return 0;
}

int is_prime(int x) {
    int i;
    for (i = 2; i *i<= x; i++) {
        if (x % i == 0) {
            return 0;}
        else { 
            return 1; }
    }
}

实验8

#include<stdio.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);
        printf("new number is:%ld\n\n", t);
        printf("Enter a number:");
    }
    return 0;
}

long func(long s) {
    long t = 0, t1 = 0;
    while (s > 0) {
        int tmp = s % 10;
        s /= 10;
        if (tmp % 2 == 1)t1 = t1 * 10 + tmp;
    }
    while (t1 > 0) {
        t = t * 10 + (t1 % 10);
        t1 /= 10;
    }
    return t;
}