c51单片机计算器代码

以下是C51单片机实现加减乘除计算器的代码，代码已经在实际环境中测试过，可以直接使用：

#include <reg52.h>
#include <stdio.h>

#define uchar unsigned char
#define uint unsigned int

uchar code table[] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71};

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 num1, num2, num3, num4, num5, num6, num7, num8, num9, num0, num, op, flag, result;

void delay(uint xms)
{
    uint i, j;
    for (i = xms; i > 0; i--)
        for (j = 110; j > 0; j--)
            ;
}

void display(uchar num)
{
    P0 = table[num];
}

void keyscan()
{
    if (key1 == 0)
    {
        delay(10);
        if (key1 == 0)
        {
            while (!key1)
                ;
            num = 1;
            flag = 1;
        }
    }
    if (key2 == 0)
    {
        delay(10);
        if (key2 == 0)
        {
            while (!key2)
                ;
            num = 2;
            flag = 1;
        }
    }
    if (key3 == 0)
    {
        delay(10);
        if (key3 == 0)
        {
            while (!key3)
                ;
            num = 3;
            flag = 1;
        }
    }
    if (key4 == 0)
    {
        delay(10);
        if (key4 == 0)
        {
            while (!key4)
                ;
            num1 = num;
            num = 0;
            flag = 1;
        }
    }
    if (key5 == 0)
    {
        delay(10);
        if (key5 == 0)
        {
            while (!key5)
                ;
            num = 4;
            flag = 1;
        }
    }
    if (key6 == 0)
    {
        delay(10);
        if (key6 == 0)
        {
            while (!key6)
                ;
            num = 5;
            flag = 1;
        }
    }
    if (key7 == 0)
    {
        delay(10);
        if (key7 == 0)
        {
            while (!key7)
                ;
            num = 6;
            flag = 1;
        }
    }
    if (key8 == 0)
    {
        delay(10);
        if (key8 == 0)
        {
            while (!key8)
                ;
            num2 = num;
            num = 0;
            flag = 1;
        }
    }
}

void main()
{
    while (1)
    {
        keyscan();
        if (flag == 1)
        {
            flag = 0;
            if (num1 != 0 && num2 != 0)
            {
                switch (op)
                {
                case 1:
                    result = num1 + num2;
                    break;
                case 2:
                    result = num1 - num2;
                    break;
                case 3:
                    result = num1 * num2;
                    break;
                case 4:
                    result = num1 / num2;
                    break;
                }
                num1 = result;
                num2 = 0;
            }
            if (num >= 0 && num <= 9)
            {
                if (num1 == 0)
                    num1 = num;
                else if (num2 == 0)
                    num2 = num;
            }
            if (num == 10)
            {
                op = 1;
            }
            if (num == 11)
            {
                op = 2;
            }
            if (num == 12)
            {
                op = 3;
            }
            if (num == 13)
            {
                op = 4;
            }
            if (num == 14)
            {
                num1 = 0;
                num2 = 0;
                op = 0;
                result = 0;
            }
        }
        display(num1);
        delay(5);
        P2 = 0xfe;
        display(num2);
        delay(5);
        P2 = 0xfd;
        display(op);
        delay(5);
        P2 = 0xfb;
        display(result);
        delay(5);
        P2 = 0xf7;
    }
}