hex文件及其工程文件下載：http://www.51hei.com/f/pingfc.rar 下面是程序源碼：

/*
*功能：使用矩陣按鍵使得按鍵按下時數碼管上顯示各自對應的數字的立方數
* 優(yōu)化顯示，只顯示有效位；
* 且使用獨立按鍵實現(xiàn)key1清零，key2加數，key3減數；
*日期：2013-05-07-10:20
*作者：徐冉
*特別說明：本程序代碼已經通過調試，僅供學習使用；
*
*/
/***********AT89C52-RC單片機-51hei實驗板***********/
/*****************51hei開發(fā)板*********************/

#include
typedef unsigned int uint;
typedef unsigned char uchar;
sbit wela = P2^7;
sbit dula = P2^6;
sbit key1 = P3^4;
sbit key2 = P3^5;
sbit key3 = P3^6;
sbit fm = P2^3;
uint temp;
uchar code table[] = {
0x3F, //"0"
0x06, //"1"
0x5B, //"2"
0x4F, //"3"
0x66, //"4"
0x6D, //"5"
0x7D, //"6"
0x07, //"7"
0x7F, //"8"
0x6F, //"9"
0x77, //"A"
0x7C, //"B"
0x39, //"C"
0x5E, //"D"
0x79, //"E"
0x71, //"F"
0x76, //"H"
0x38, //"L"
0x37, //"n"
0x3E, //"u"
0x73, //"P"
0x5C, //"o"
0x40, //"-"
0x00, //熄滅
0x00 //自定義
};
// uchar key; Error!!! 此時的key值大于258 超出了uchar 故錯誤！！
uint key;
void display(num);
void delay(uint xms);
void max_kanscan();
void keyscan();
void main(void)
{
while(1)
{
keyscan();
max_kanscan();
display(key);
}
}

void display(num)
{
uchar qian, bai, shi, ge;
qian = num / 1000 % 10;
bai = num / 100 % 10;
shi = num / 10 % 10;
ge = num % 10;

if(num < 10)
{
dula = 1;
P0 =table[ge];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfe;
wela = 0;
}
else if(num < 100)
{
dula = 1;
P0 =table[shi];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfe;
wela = 0;
P0 = 0x00;
delay(1);

dula = 1;
P0 =table[ge];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfd;
wela = 0;
P0 = 0x00;
delay(1);
}
else if(num < 1000)
{
dula = 1;
P0 =table[bai];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfe;
wela = 0;
P0 = 0x00;
delay(1);

dula = 1;
P0 =table[shi];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfd;
wela = 0;
P0 = 0x00;
delay(1);

dula = 1;
P0 =table[ge];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfb;
wela = 0;
P0 = 0x00;
delay(1);
}
else if(num < 10000)
{
dula = 1;
P0 =table[qian];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfe;
wela = 0;
P0 = 0x00;
delay(1);

dula = 1;
P0 =table[bai];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfd;
wela = 0;
P0 = 0x00;
delay(1);

dula = 1;
P0 =table[shi];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfb;
wela = 0;
P0 = 0x00;
delay(1);

dula = 1;
P0 =table[ge];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xf7;
wela = 0;
P0 = 0x00;
delay(1);
}

}