实验三

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

void printText(int line,int col,char text[]);
void printSpaces(int n);
void printBlankLines(int n);

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

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

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

void printText(int line,int col,char text[])
{
    printBlankLines(line-1);
    printSpaces(col-1);
    printf("%s",text);
}

程序功能：在屏幕上 25行，80列 的范围内任意位置打印十次字符串”hi,May~“，每次打印间隔1000ms

#include <stdio.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));
return 0;
}
// 函数定义
long long fac(int n)
{
static long long p=1;
//printf("p = %lld\n", p);
p=p*n;
return p;
}

 

#include<stdio.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);
    
    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；一致；只初始化一次，之后不再初始化

#include<stdio.h>
long long fun(int n);

int main()
{
    int n;
    long long f;
    
    while(scanf("%d",&n)!=EOF)
    {
        f=fun(n)-1;
        printf("n=%d,f=%lld\n",n,f);
    }
    
    return 0;
}

long long fun(int n)
{
    long long s;
    if(n==0)
       return 1;
    else
       s=2*fun(n-1);
       
    return s;   
}

#include<stdio.h>
#include<math.h>

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 count;
    while(scanf("%u",&n)!=EOF)
    {
        count=pow(2,n)-1;
        hanoi(n,'A','B','C');
    
        printf("\n");
        
        if(n>=2)
           printf("一共移动了%d次\n",count);
        else
           printf("一共移动了了1次\n");
           
        printf("\n");    
    }
    
    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("第%u个盘子:%c-->%c\n",n,from,to);
}

#include<stdio.h>
#include<math.h>

int is_prime(int a);

int main()
{
    int n,a;
    for(n=4;n<=20;n+=2)
    {
        for(a=2;a<=n/2;a++)
        {
            if(is_prime(a)&&is_prime(n-a))
            {
                printf("%d=%d+%d\n",n,a,n-a);
                break;
            }            
        }
    }

    return 0;
}

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

#include <stdio.h>
#include<math.h>
long fun(long s);   // 函数声明
int main()
{
    long s, t;
    printf("Enter a number: ");
    while (scanf("%ld", &s) != EOF) 
    {
        t = fun(s); // 函数调用
        printf("new number is: %ld\n\n", t);
        printf("Enter a number: ");    }
        return 0;
}
// 函数定义
long fun(long s)
{   
    long r=0;
    int i=0;
    while (s != 0)
    {
        long t;
        t = s % 10;
        if (t % 2 == 1)
        {
            r += pow(10, i) * t;
            i++;
        }
        s = s / 10;
    }
    
    return r;
}