实验三

实验任务1

#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);
}

 

 

 间隔一秒打印“hi，May~”

 

实验任务2.1

#include<stdio.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));
    
    return 0;
}


long long fac(int n)
{
    static long long p=1;
    
    p=p*n;
    
    return p;
}

 

 

 

实验任务2.2

#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;
}

 

 

实验任务3

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

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

long long fun(int n)
{
    int i;
    long long f,j=1.0;
    for(i=1;i<=n;i++)
    {
        j=j*2;
     } 
         f=j-1;
     return f;
}

 

 

实验任务4

#include<stdio.h>
void hanoi(unsigned int n,char from,char temp,char to);
void moveplate(unsigned int n,char from,char to);
int i;
int main()
{
    unsigned n;
    while(scanf("%u",&n)!=EOF)
    {
    i=0;
    hanoi(n,'A','B','C');
    printf("一共移动了%d次",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("第%d个盘子：%u:%c-->%c\n",i,n,from,to);
    i++;
}

 

 

实验任务5

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int is_prime(int n);
int main()
{
    int n,p,q,flagp,flagq;              
    for(n=4;n<=20;n+=2)
    {
        p = 1;
        do
        {
            p++;
            q=n-p;
            flagp=is_prime(p);
            flagq=is_prime(q);
        } 
        while(flagq*flagp == 0);
        printf("%d =%d +%d\n", n, p, q);
    }
    return 0;
}

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

 

 

实验任务6

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

int main()
{
    long s,t;
    printf("Enter a number:");
    while(scanf("%ld",&s)!=EOF)
    {
        t=fun(s);
        printf("new number is:%ld\n\n",t);
        printf("Enter a number:");
    }
    return 0;
}

long fun(long s)
{
    int d;
    long t=0;
    long s1=1;
    while(s>0)
    { 
        d=s%10;
        if(d%2!=0)
        {
            t=d*s1+t;
            s1*=10;
        }
        else
        {
            t=t;
        }
        s/=10;
    }
    return t;
}