实验3

task1.c
#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);
}

根据当前的时间随机生成对应的行和列，并在该位置打印hi may。

task2.1.c
#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;
}

task2.2.c
#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;
}

task3.c
#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 int p=1;
    for(i=1;i<=n;++i)
    {
        p=p*2;
    }
    p=p-1;
    return p;
}

task.4.c
#include<stdio.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 i;
    while(scanf("%u",&n)!=EOF)
    {
        hanoi(n,'A','B','C');
        printf("\n");
        printf("一共移动了%d次.\n\n",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%u个盘子:%c-->%c\n",n,from,to);
}

尝试了许多i都不会：（

task5.c
#include<stdio.h>
void is_prime();
int main()
{
    int n;
    int i,j,k;
    i=is_prime(n);
    for(k=4;k<=20;k+=2)
    {
        i+j=k;
        printf("%d=%d+%d\n",k,i,j);
    }
    return 0;    
}
void is_prime(n)
{
    int m,h;
    for(n=2;n<=20;n++)
    {
        if(n==2)
            h=n;
        for(m=2;m<n;++m)
        {
            if(n%m==0)
                break;
            else
                h=n;
        }
    }
    return h;
}

代码错了，但不知道为什么。。。

task6.c
#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 i,j;
    long int n=1,m=0;
    while(s>0)
    {
        j=s%10;
        if(j%2==1)
        {
            m=m+j*n;
            n*=10;
        }
        s/=10;
    }
    return m;
}