实验三

`#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
}`

`#include <stdio.h>

include<stdlib.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));
system("pause");
return 0;

}

// 函数定义
long long fac(int n) {
static long long p = 1;

p = p * n;

return p;

}`

`#include<stdio.h>

include<stdlib.h>

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

long long func(int x)
{
long long ans=0;

if(x==1)
    ans=1;
else
    ans=2*func(x-1)+1;

return ans;

}`

`

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){
int i;
int up=1;
int down=1;

if(m>n)
{
	return 0;
}
else if(m==0&&n==0)
{
	return 1;
}

else
{
for(i=1;i<=m;i++)
{
	up*=n-i+1;
	down*=i;
}
return up/down;

}
}
`

`#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(m>n)
{
return 0;
}

else if(m==n||m==0)
{
	return 1;
}

else
{
	int i;
	i=func(n-1,m)+func(n-1,m-1);
	return i;
}

}`

`#include<stdio.h>

include<stdlib.h>

include<math.h>

void hanoi(unsigned int n,char from,char temp,char to);
void moves(unsigned int n,char from,char to);

int main()
{
unsigned int n;
int s;
while(scanf("%d",&n)!=EOF)
{
hanoi(n,'A','B','C');
s=pow(2,n)-1;
printf("一共移动了%d次\n",s);
}
system("pause");
return 0;
}

void hanoi(unsigned int n,char from,char temp,char to)
{
if(n==1)
moves(n,from,to);
else
{
hanoi(n-1,from,to,temp);
moves(n,from,to);
hanoi(n-1,temp,from,to);
}
}

void moves(unsigned int n,char from,char to)
{
printf("%d:%c-->%c\n",n,from,to);
}
`

`#include <stdio.h>

include <math.h>

long func(long s); // 函数声明

int main() {

long s, t;

printf("Enter a number: ");
while (scanf("%ld", &s) != EOF) {
    t = func(s); // 函数调用
    printf("new number is: %ld\n\n", t);
    printf("Enter a number: ");
}

return 0;

}

// 函数定义
// 待补足。。。

long func(long s){
long ans;
long digit,t;

ans=0;
t=1;

while(s!=0){
	digit=s%10;
	
	if(digit%2){
		ans +=t*digit;
		t*=10;
	}
	s /=10;
}
return ans;

}`