实验三
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#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
}
作用是每秒在25x80的区域内随机产生一个hi, April~
2.11
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// 利用局部static变量的特性，计算阶乘
#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;
}
2.12
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#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;
printf("p = %lld\n", p);
p = p * n;
return p;
}
2.2
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#include <stdio.h>
#include<stdlib.h>
int func(int, int); // 函数声明
int main() {
int k = 4, m = 1, p1, p2;
p1 = func(k, m); // 函数调用
p2 = func(k, m); // 函数调用
printf("%d, %d\n", p1, p2);
system("pause");
return 0;
}
// 函数定义
int func(int a, int b) {
static int m = 0, i = 2;
i += m + 1;
m = i + a + b;
return m;
}
static的作用是使变量只赋值一次。
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#include <stdio.h>
#include<stdlib.h>
long long func(int n); // 函数声明
int main() {
int n;
long long f;
while (scanf("%d", &n) != EOF) {
f = func(n); // 函数调用
printf("n = %d, f = %lld\n", n, f);
}
system("pause");
return 0;
}
long long func(int n){
long long s;
if(n==1){
s=1;
}else{
s=2*(func(n-1)+1)-1;
}
return s;
}
4.1
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#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,j,s=1,k=1;
for(i=n-m+1;i<=n;i++){
s*=i;
}
for(j=1;j<=m;j++){
k*=j;
}
return 1.0*s/k;
}
4.2
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#include <stdio.h>
#include<stdlib.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));
system("pause");
return 0;
}
int func(int n, int m){
int s;
if(m==0){
s=1;
}else if(m==1){
s=n;
}else if(m>n){
s=0;
}else{
s=func(n-1,m)+func(n-1,m-1);
}
return s;
}
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#include<stdio.h>
#include<stdlib.h>
void hanoi(unsigned int n,char from,char temp,char to);
void moveplate(unsigned int n,char from,char to);
int sum(int n);
int main(){
unsigned int n;
int k;
while(scanf("%u",&n)!=EOF){
hanoi(n,'A','B','C');
k=sum(n);
printf("一共移动了%d次\n",k);
}
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);
}
int sum(int n){
if(n==1)
return 1;
if(n>1)
return 2*sum(n-1)+1;
}
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#include <stdio.h>
#include <math.h>
#include<stdlib.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: ");
}
system("pause");
return 0;
}
long func(long s){
int k=0,p=0;
while(s!=0){
switch(s%10){
case 0:
case 2:
case 4:
case 6:
case 8:break;
case 1:k=k*10+1;break;
case 3:k=k*10+3;break;
case 5:k=k*10+5;break;
case 7:k=k*10+7;break;
case 9:k=k*10+9;break;
}
s/=10;
}
while(k!=0){
p=p*10+k%10;
k/=10;
}
return p;
}
