实验3

task 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);
}

task 2.1

#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;
p = p * n;
return p;
}

task 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;
}

task 3

#include <stdio.h>
long long fun(int n); // 函数声明
int main()
{
int n;
long long f;
while (scanf("%d", &n) != EOF)
{
f = fun(n); // 函数调用
printf("n = %d, f = %lld\n", n, f);
}
return 0;
}
long long fun(int n){
    int m,i,s=1;
    for(i=0;i<n;i++)
    {s=s*2;
    m=s-1;        
}

    return m;
}

task 4

#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,t;
while(scanf("%u",&n)!=EOF)
{
hanoi(n,'A','B','C');
t = pow(2,n)-1;
printf("\n一共移动了%d次\n\n",t);
}
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);
}

 

task 5

#include <stdio.h>
int Isprime(int n){
int i;
for(i=2;i<=n-1;i++)
{
if(n%i==0) 
return 0;
}
return 1;
}
int main(){
int i,n;
for(n=4;n<=20;n+=2)
{
for(i=2;i<=n/2;i++)
{
if(Isprime(i)*Isprime(n-i)){
printf("%d=%d+%d\n",n,i,n-i);
break;
}
}
}
return 0;
}

task 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: %1d\n\n", t);
        printf("enter a number:");
    }
    return 0;
}
long fun(long s)
{
    int m=1,k,s0=0;
    while (s != 0)
    {
        k = s % 10;
        if (k % 2 == 1)
        {
            s0 = s0 + k * m;
            m = 10 * m;
        }
        s = s / 10;
    }
    return s0;
}