电子表决器 功能：可对某一个议题进行表决，表决人数为“0-9”，10人“A”表示赞成，“B”表示反对，预设通过表决条件，当符合条件时，LED亮绿色，否则亮红色，并显示赞成反对弃权的比例 要求： ①超级终端显示议题内容，表决结果后同步显示在议题后 3按键表决可以两步完成：1.编号，2.表决，不按者视为弃权 4数码管显示投票结果票数，LED显示表决结果如何用51单片机c语言实现代码

以下是一个简单的电子表决器的代码实现，使用了51单片机和LCD屏幕：

#include <reg51.h>
#include <stdio.h>

// 配置LCD屏幕
#define LCD_DB P0
sbit RS = P2^0;
sbit RW = P2^1;
sbit EN = P2^2;
void LcdWriteCmd(unsigned char cmd) {
    RS = 0;
    RW = 0;
    LCD_DB = cmd;
    EN = 1;
    EN = 0;
}
void LcdWriteData(unsigned char dat) {
    RS = 1;
    RW = 0;
    LCD_DB = dat;
    EN = 1;
    EN = 0;
}
void LcdInit() {
    LcdWriteCmd(0x38);
    LcdWriteCmd(0x0c);
    LcdWriteCmd(0x06);
    LcdWriteCmd(0x01);
}

// 定义投票结果
int agree = 0, oppose = 0, abstain = 0;

// 处理按键输入
void HandleKeypad(char key) {
    if (key == 'A') {
        agree++;
    } else if (key == 'B') {
        oppose++;
    } else if (key >= '0' && key <= '9') {
        abstain++;
    }
}

// 显示投票结果
void ShowResult() {
    int total = agree + oppose + abstain;
    char buffer[16];
    sprintf(buffer, "Agree: %d", agree);
    LcdWriteCmd(0x80);
    for (int i = 0; i < 8; i++) {
        LcdWriteData(buffer[i]);
    }
    sprintf(buffer, "Oppose: %d", oppose);
    LcdWriteCmd(0x90);
    for (int i = 0; i < 8; i++) {
        LcdWriteData(buffer[i]);
    }
    sprintf(buffer, "Abstain: %d", abstain);
    LcdWriteCmd(0x88);
    for (int i = 0; i < 8; i++) {
        LcdWriteData(buffer[i]);
    }
    sprintf(buffer, "Total: %d", total);
    LcdWriteCmd(0x98);
    for (int i = 0; i < 8; i++) {
        LcdWriteData(buffer[i]);
    }
    if ((float)agree / total >= 0.5) {
        LcdWriteCmd(0xc0);
        LcdWriteData('P');
        LcdWriteData('a');
        LcdWriteData('s');
        LcdWriteData('s');
    } else {
        LcdWriteCmd(0xc0);
        LcdWriteData('F');
        LcdWriteData('a');
        LcdWriteData('i');
        LcdWriteData('l');
    }
}

void main() {
    LcdInit();
    LcdWriteCmd(0x80);
    LcdWriteData('V');
    LcdWriteData('o');
    LcdWriteData('t');
    LcdWriteData('e');
    LcdWriteData(' ');
    LcdWriteData('N');
    LcdWriteData('o');
    LcdWriteData('w');
    while (1) {
        for (int i = 0; i < 10; i++) {
            char key = GetKeypadInput();
            if (key) {
                HandleKeypad(key);
                break;
            }
        }
        ShowResult();
    }
}

这里假设已经实现了一个名为 `GetKeypadInput` 的函数，可以获取按键输入。这个函数需要根据实际硬件情况进行实现，常见的方法是使用矩阵按键扫描。