experiment3

EX3
Task1
`#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);
}
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
}`

在25行、80列内，每隔一秒随机生成文字

Task2
`#include<stdio.h>

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

long long fac(int n)
{
static long long p = 1;
printf("p = %lld\n",p);
p = p*n;
return p;
}`

Task2.2
`#include<stdio.h>

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

int func(int a, int b)
{
static int m = 0, i = 2;
i = i + m + 1;
m = i + a + b;
return m;
}`

生成8，17

Task3
`#include <stdio.h>
long long func(int n); // 函数声明

int main() {
int n;
long long f;

while (scanf("%d", &n) != EOF) {
    if (n<0||n>32)
        {printf("Error,n>=0&&n<=32");
    break;}
    else
    f = func(n); // 函数调用
    printf("n = %d, f = %lld\n", n, f);
}
return 0;

}

long long func(int n)
{
if(n==0)
return 0;
else
return 2*(func(n-1)+1)-1;
}`

Task4.1
#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 x=1,y=1; int t,j=m; for(t=1;t<=j;t++) {y=y*m;--m;} for(t=1;t<=j;t++) {x=x*n;--n;} return x/y; }

Task4.2
#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(n<m) return 0; if(m==0 || n==m) return 1; else return func(n-1,m-1)+func(n-1,m); }

Task5
`#include<stdio.h>

include<stdlib.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()
{
float n;
int x;
while((scanf("%f",&n))!=EOF)
{hanoi(n,'A','B','C');
x = pow(2,n)-1;
printf("一共移动了%d次\n",x);}
system("pause");
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("%u;%c-->%c\n",n,from,to);
}`

Task6
`#include<stdio.h>

include<math.h>

include<stdlib.h>

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

long func(long s)
{
long t=1,m;
long ans=0;
int n = sizeof(s);
while(s!=0)
{
m = s%10;
if(m%2 == 1){
ans = ans + tm;
t =t10;}
s = s/10;
}
return ans;
}`