#include <reg51.h> sbit LED = P1^0; sbit KEY = P1^1; void delay(unsigned int ms) { unsigned int i; for(; ms>0; ms--) for(i=0; i<120; i++); } void main() { while(1) { if(KEY == 0) { delay(20); if(KEY == 0) { LED = ~LED; while(KEY == 0); } } } }


这段代码实现了基于51单片机的按键控制LED状态切换功能。当检测到按键按下时,LED状态翻转。 代码分析: 1. 硬件连接:LED接P1.0,按键接P1.1(低电平有效) 2. 消抖处理:检测到按键按下后延时20ms再次检测 3. 状态切换:使用取反操作实现LED亮灭切换 4. 按键释放检测:保持LED状态直到按键释放 优化建议: 1. 延时函数可改为参数化精确延时 2. 添加LED初始化状态 3. 可定义宏提高可读性 改进版本: ```c #include <reg51.h> #define LED P1_0 #define KEY P1_1 #define DEBOUNCE_TIME 20 void delay(unsigned int ms) { unsigned int i, j; for(i=0; i<ms; i++) for(j=0; j<120; j++); } void main() { LED = 1; // 初始化为熄灭状态 while(1) { if(KEY == 0) { delay(DEBOUNCE_TIME); if(KEY == 0) { LED = ~LED; while(KEY == 0); // 等待按键释放 } } } } ``` 注意事项: 1. 按键硬件需要上拉电阻确保默认高电平 2. 延时时间需要根据实际晶振频率调整 3. 快速连续按键可能导致状态多次切换 [2025-06-22 23:19:40 | AI写代码神器 | 326点数解答]
- #include <reg51.h> sbit LED = P1^0; sbit KEY = P1^1; void delay(unsigned int ms) { unsigned int i; for(; ms>0; ms--) for(i=0; i<120; i++); } void main() { while(1) { if(KEY == 0) { delay(20); if(KEY == 0) { LED = ~LED; while(KEY == 0); } } } } (326点数解答 | 2025-06-22 23:19:40)99
- #include <reg51.h> 3 sbit button=p1^0; 4 sbit led=pl^1; 5 6 bit led_state=0; 7 8日void delay(unsigned int ms){ 9 unsigned int i,j: 10 for(i=ms;i>0;i--) 11 for(j=110;j>0;j--); 12 } 13 14日void main(){ 15 while(1){ 16 白 if (button==0){ 17 delay(20); 18 if (button-=0){ 19 while (button==ah; 20 led state=~led state; 21 led=led state; 22 } 写详细注释(697点数解答 | 2024-10-29 14:54:31)220
- #include <reg51.h> 1 2 3 sbit button=p1^0; 4 sbit led=p1^1; 5 bit led state=0; 6 7 8日void delay(unsigned int ms){ 9 unsigned int i,j; 10 for(i=ms;i>0;i--) 11 for(j=110;j>0;j--); 1213 14 void main()【 15 while(1){ 16 if (button==0){ 17 delay(20); 18 if (button==0){ 19 1ed=0; 20 21 } 做详细注释(830点数解答 | 2024-10-29 15:29:41)215
- #include <reg51.h> 1 2 3 sbit button=p1^0; 4 sbit led=p1^1; 5 bit led state=0; 6 7 8日void delay(unsigned int ms){ 9 unsigned int i,j; 10 for(i=ms;i>0;i--) 11 for(j=110;j>0;j--); 1213 14 void main()【 15 while(1){ 16 if (button==0){ 17 delay(20); 18 if (button==0){ 19 1ed=0; 20 21 } 做注释(693点数解答 | 2024-10-29 15:31:00)332
- #include <reg51.h> 1 2 3 sbit button=p1^0; 4 sbit led=p1^1; 5 bit led state=0; 6 7 8日void delay(unsigned int ms){ 9 unsigned int i,j; 10 for(i=ms;i>0;i--) 11 for(j=110;j>0;j--); 1213 14 void main()【 15 while(1){ 16 if (button==0){ 17 delay(20); 18 if (button==0){ 19 1ed=0; 20 21 }(570点数解答 | 2024-10-29 15:32:29)179
- 把这个代码修改正确#include<reg52.h> sbit key = p3^0; // 按键连接到p3.0 unsigned char code seg_code[] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f}; // 数码管段码 unsigned char code dash_code = 0x40; // 横杠段码 unsigned int second =0; // 秒表计数 bit running = 0; // 秒表运行状态 void timer0_isr() interrupt 1 { static unsigned int count =0; th0 = (65536 - 1000) / 256; tl0 = (65536 - 1000) %256; count++; if (count >= 1000) { count = 0; if (running) { second++; } } } void delay(unsigned int ms) { unsigned int i(776点数解答 | 2024-10-23 22:51:51)202
- 实现哈希表创建及查找算法,哈希函数使用除余法,用线性探测法处理冲突。 函数接口定义: void createhash(hashtable ht[],int n); //输入不大于m的n个不为0(0表示空值)的数,用线性探查法解决冲突构造散列表 int searchhash(hashtable ht[],int key); //输入一个值key,在散列表中查找key位置 其中 ht 表示哈希表, n表示记录数,key要查找的关键字 裁判测试程序样例: #include<iostream> using namespace std; #define m 16 #define nullkey 0 //单元为空的标记 struct hashtable{ int key; }; void createhash(hashtable ht[],int n); int searchhash(hashtable ht[],int key); int main() { int value,key; int result; int i,j,n; hashtable ht[m]; for(i=0;i<m;i++) ht[i].key=0; cin >> n; if(n>m) return 0; createhash(ht,n); cin >> key; result=searchhash(ht,key); if(result!=-1) cout << "search success,the key is located in "<< result+1; else cout << "search failed"; return 0; } /* 请在这里填写答案 */ 输入样例: 12 19 14 23 1 68 20 84 27 55 11 10 79 55 输出样例: 输出拓扑序列。 search success,the key is located in 6(504点数解答 | 2024-12-21 16:14:58)176
- 实现哈希表创建及查找算法,哈希函数使用除余法,用线性探测法处理冲突。 函数接口定义: void createhash(hashtable ht[],int n); //输入不大于m的n个不为0(0表示空值)的数,用线性探查法解决冲突构造散列表 int searchhash(hashtable ht[],int key); //输入一个值key,在散列表中查找key位置 其中 ht 表示哈希表, n表示记录数,key要查找的关键字 裁判测试程序样例: #include<iostream> using namespace std; #define m 16 #define nullkey 0 //单元为空的标记 struct hashtable{ int key; }; void createhash(hashtable ht[],int n); int searchhash(hashtable ht[],int key); int main() { int value,key; int result; int i,j,n; hashtable ht[m]; for(i=0;i<m;i++) ht[i].key=0; cin >> n; if(n>m) return 0; createhash(ht,n); cin >> key; result=searchhash(ht,key); if(result!=-1) cout << "search success,the key is located in "<< result+1; else cout << "search failed"; return 0; } /* 请在这里填写答案 */ 输入样例: 12 19 14 23 1 68 20 84 27 55 11 10 79 55 输出样例: 输出拓扑序列。 search success,the key is located in 6(328点数解答 | 2024-12-21 16:15:59)236
- 实现哈希表创建及查找算法,哈希函数使用除余法,用线性探测法处理冲突。 函数接口定义: void createhash(hashtable ht[],int n); //输入不大于m的n个不为0(0表示空值)的数,用线性探查法解决冲突构造散列表 int searchhash(hashtable ht[],int key); //输入一个值key,在散列表中查找key位置 其中 ht 表示哈希表, n表示记录数,key要查找的关键字 裁判测试程序样例: #include<iostream> using namespace std; #define m 16 #define nullkey 0 //单元为空的标记 struct hashtable{ int key; }; void createhash(hashtable ht[],int n); int searchhash(hashtable ht[],int key); int main() { int value,key; int result; int i,j,n; hashtable ht[m]; for(i=0;i<m;i++) ht[i].key=0; cin >> n; if(n>m) return 0; createhash(ht,n); cin >> key; result=searchhash(ht,key); if(result!=-1) cout << "search success,the key is located in "<< result+1; else cout << "search failed"; return 0; } /* 请在这里填写答案 */ 输入样例: 12 19 14 23 1 68 20 84 27 55 11 10 79 55 输出样例: 输出拓扑序列。 search success,the key is located in 6(282点数解答 | 2024-12-21 16:16:03)208
- #include<iostream> #include<complex.h> #include <complex> #include <math.h> using namespace std; #define pi 3.14159265358979323846 int main() { file* stream; stream = fopen("4000-red.raw","rb"); unsigned char* image = (unsigned char*)malloc(4000 * 4000 * sizeof(unsigned char)); fread(image,4000*4000,sizeof(unsigned char),stream); unsigned char* image2 = (unsigned char*)malloc(4000 * 4000 * sizeof(unsigned char)); unsigned char* image3 = (unsigned char*)malloc(4000 * 4000 * sizeof(unsigned(413点数解答 | 2024-11-02 18:16:35)218
- 外部中断 0 由边沿触发,控制 P2 口的 8 个发光二极管依次点亮。C51 程序如下: #include <reg51.h> void ex0_isr() interrupt 0 { static unsigned char led = 0x01; P2 = led; led = (led << 1) | (led >> 7); } void main() { IT0 = 1; EX0 = 1; EA = 1; P2 = 0x01; while(1); } (228点数解答 | 2025-06-22 23:18:42)75
- #include <reg51.h> void ex0_isr() interrupt 0 { static unsigned char led = 0x01; P2 = led; led = (led << 1) | (led >> 7); } void main() { IT0 = 1; EX0 = 1; EA = 1; P2 = 0x01; while(1); }(214点数解答 | 2025-06-22 23:19:09)95