keil写简易计算器代码

以下是使用 Keil 编写的简易计算器代码示例：

#include <reg51.h>

#define uchar unsigned char
#define uint unsigned int

sbit key1 = P1 ^ 0;
sbit key2 = P1 ^ 1;
sbit key3 = P1 ^ 2;
sbit key4 = P1 ^ 3;
sbit key5 = P1 ^ 4;
sbit key6 = P1 ^ 5;
sbit key7 = P1 ^ 6;
sbit key8 = P1 ^ 7;

uchar code table[] = {
    0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f
};

void delay(uint i) // 延迟函数
{
    while (i--);
}

void display(uchar num) // 数码管显示函数
{
    P0 = table[num];
}

void main()
{
    uchar num1 = 0, num2 = 0, op = 0, result = 0;
    while (1) {
        // 检测按键
        if (key1 == 0) {
            delay(1000);
            if (key1 == 0) {
                num1 = num1 * 10 + 1;
                display(num1);
            }
            while (!key1);
        }
        if (key2 == 0) {
            delay(1000);
            if (key2 == 0) {
                num1 = num1 * 10 + 2;
                display(num1);
            }
            while (!key2);
        }
        if (key3 == 0) {
            delay(1000);
            if (key3 == 0) {
                num1 = num1 * 10 + 3;
                display(num1);
            }
            while (!key3);
        }
        if (key4 == 0) {
            delay(1000);
            if (key4 == 0) {
                op = '+';
                num2 = num1;
                num1 = 0;
                display(op);
            }
            while (!key4);
        }
        if (key5 == 0) {
            delay(1000);
            if (key5 == 0) {
                num1 = num1 * 10 + 4;
                display(num1);
            }
            while (!key5);
        }
        if (key6 == 0) {
            delay(1000);
            if (key6 == 0) {
                num1 = num1 * 10 + 5;
                display(num1);
            }
            while (!key6);
        }
        if (key7 == 0) {
            delay(1000);
            if (key7 == 0) {
                num1 = num1 * 10 + 6;
                display(num1);
            }
            while (!key7);
        }
        if (key8 == 0) {
            delay(1000);
            if (key8 == 0) {
                result = num1 + num2;
                display(result);
            }
            while (!key8);
        }
    }
}

这个代码示例使用了单片机上的按键和数码管，实现了简单的加法运算。具体实现过程请参考代码注释。