单片机做简易计算器的课程设计（附原理图，程序，ppt和word） -

#include <reg51.h>
#include <intrins.h>
#include <ctype.h> /* isdigit()函数 */
#include <stdlib.h> /* atoi()函数 */
#define uchar unsigned char
#define uint unsigned int
uchar operand1[9], operand2[9]; /* 操作数 */
uchar operator; /* 操作符 */
void delay(uint);
uchar keyscan();
void disp(void);
void buf(uint value);
uint compute(uint va1,uint va2,uchar optor);
uchar code table[] = {0xc0,0xf9,0xa4,0xb0,0x99,
0x92,0x82,0xf8,0x80,0x90,0xff}; /* 字符码表 */
uchar dbuf[8] = {10,10,10,10,10,10,10,10}; /* 显示缓存 */
/* 延时函数 */
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
/*******************************************
键盘扫描程序
将按键转化为字符并作为输出
,'#'分别表示清零键和没有键按下
*******************************************/
uchar keyscan()
{
uchar skey; /* 按键值标记变量 */
/***********************
扫描键盘第1行
************************/
P1 = 0xfe;
while((P1 & 0xf0) != 0xf0) /* 有按键按下 */
{
delay(3); /* 去抖动延时 */
while((P1 & 0xf0) != 0xf0) /* 仍有键按下 */
{
switch(P1) /* 识别按键并赋值 */
{
case 0xee: skey = '7'; break;
case 0xde: skey = '8'; break;
case 0xbe: skey = '9'; break;
case 0x7e: skey = '/'; break;
default: skey = '#';
}
while((P1 & 0xf0) != 0xf0) /* 等待按键松开 */
;
}
}
/***********************
扫描键盘第2行
************************/
P1 = 0xfd;
while((P1 & 0xf0) != 0xf0)
{
delay(3);
while((P1 & 0xf0) != 0xf0)
{
switch(P1)
{
case 0xed: skey = '4'; break;
case 0xdd: skey = '5'; break;
case 0xbd: skey = '6'; break;
case 0x7d: skey = '*'; break;
default: skey = '#';
}
while((P1 & 0xf0) != 0xf0)
;
}
}
/***********************
扫描键盘第3行
************************/
P1 = 0xfb;
while((P1 & 0xf0) != 0xf0)
{
delay(3);
while((P1 & 0xf0) != 0xf0)
{
switch(P1)
{
case 0xeb: skey = '1'; break;
case 0xdb: skey = '2'; break;
case 0xbb: skey = '3'; break;
case 0x7b: skey = '-'; break;
default: skey = '#';
}
while((P1 & 0xf0) != 0xf0)
;
}
}
/***********************
扫描键盘第4行
************************/
P1 = 0xf7;
while((P1 & 0xf0) != 0xf0)
{
delay(3);
while((P1 & 0xf0) != 0xf0)
{
switch(P1)
{
case 0xe7: skey = '[b]
; break;
case 0xd7: skey = '0'; break;
case 0xb7: skey = '='; break;
case 0x77: skey = '+'; break;
default: skey = '#';
}
while((P1 & 0xf0) != 0xf0)
;
}
}
return skey;
}
void main()
{
uint value1, value2, value; /* 数值1,数值2,结果 */
uchar ckey, cut1 = 0, cut2 = 0; /* ckey键盘输入字符 */
uchar operator; /* 运算符 */
uchar i, bool = 0;
init: /* goto语句定位标签 */
buf(0); /* 初始化 */
disp();
value = 0;
cut1 = cut2 = 0;
bool = 0;
for(i = 0;i < 9;i++)
{
operand1[i] = '\0';
operand2[i] = '\0';
} /* 初始化 */
while(1)
{
ckey = keyscan(); /* 读取键盘 */
if(ckey != '#')
{ /* isdigit函数，字符是阿拉伯数字返回非0值，否则返回0 */
if(isdigit(ckey))
{
switch(bool)
{
case 0:
operand1[cut1] = ckey;
operand1[cut1+1] = '\0';
value1 = atoi(operand1); /* atoi函数，将字符串转化为，int整数 */
cut1++;
buf(value1);
disp();
break;
case 1:
operand2[cut2] = ckey;
operand2[cut2+1] = '\0';
value2 = atoi(operand2);
cut2++;
buf(value2);
disp();
break;
default: break;
}
}
else if(ckey=='+'||ckey=='-'||ckey=='*'||ckey=='/')
{
bool = 1;
operator = ckey;
buf(0);
dbuf[7] = 10;
disp();
}
else if(ckey == '=')
{
value = compute(value1,value2,operator);
buf(value);
disp();
while(1) /* 计算结束等待清零键按下 */
{
ckey = keyscan();
if(ckey == '
) /* 如果有清零键按下跳转到开始 */
goto init;
else
{
buf(value);
disp();
}
}
}
else if(ckey == '[b]
)
{ goto init;}
}
disp();
}
}
/******************************************
运算函数
输入：操作数和操作符
输出：计算结果
*******************************************/
uint compute(uint va1,uint va2,uchar optor)
{
uint value;
switch(optor)
{
case '+' : value = va1+va2; break;
case '-' : value = va1-va2; break;
case '*' : value = va1*va2; break;
case '/' : value = va1/va2; break;
default : break;
}
return value;
}
/*******************************************
更新显示缓存
输入：无符号整数
输出：将输入送入显示缓存
*******************************************/
void buf(uint val)
{
uchar i;
if(val == 0)
{
dbuf[7] = 0;
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