程序的话可以给你一个作为参考！ 实现了计算结果的小数显示。
//扫描显示6位数码管，显示信息为缓冲区的六个“0”
//2017.8.7 添加浮点数显示支持
#include
#include
#include
#define uchar unsigned char // 宏定义
#define uint unsigned int
#define KEY P1
uchar code Tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,//
0x77,0x7c,0x39,0x5e,0x79,0x71,0x00}; //00 显示空
uchar disp_buffer[6]={2,0,1,7,0,5} ,buf[10]; //显示缓冲区
uchar flag = 0;
long dat1,dat2;
float temp;
bit keypress = 1,getv = 0;
void p_data(long dat);
void display();
//延时子程序,带有输入参数 m
void delay(unsigned int m)
{
unsigned int i,j;
for(i=0;i { for(j=0;j<123;j++) {;} } } //按键扫描程序 4X4 uchar key() { uchar keytemp , key_h; KEY = 0xf0; if((KEY &0xf0)!= 0xf0) { keytemp = KEY&0xf0; KEY = 0x0f; //翻转 key_h = KEY&0x0f; keytemp = keytemp | key_h; switch(keytemp) { case 0xee: return(0);break; case 0xed: return(1);break; case 0xeb: return(2);break; case 0xe7: return(3);break; case 0xde: return(4);break; case 0xdd: return(5);break; case 0xdb: return(6);break; case 0xd7: return(7);break; case 0xbe: return(8);break; case 0xbd: return(9);break; case 0xbb: return(10);break; case 0xb7: return(11);break; case 0x7e: return(12);break; case 0x7d: return(13);break; case 0x7b: return(14);break; case 0x77: return(15);break; } } return 0xff; } void keyscan() { uchar getk; getk = key(); if(getk != 0xff) { delay(10); getk = key(); if(getk != 0xff) { if(keypress) { keypress = 0; switch(getk) { case 0x0a: //根据按键决定是做哪种运算，并置位getv getv = 1; flag = 1; break; case 0x0b: getv = 1; flag = 2; break; case 0x0c: getv = 1; flag = 3; break; case 0x0d:// flag = 4; getv = 1; break; case 0x0e: getv = 0; switch(flag) //按等号键 进行运算，并将结果输出给temp 用于显示 { case 1: temp = dat1 + dat2; break; case 2: temp = dat1 - dat2; break; case 3: temp = dat1 * dat2; break; case 4: temp = (float)dat1 / (float)dat2; break; } dat1 = 0; dat2 = 0; flag = 0; break; case 0x0f: if(!getv) { dat1 = dat1/10;; temp = dat1; } else { dat2 = dat2/10; temp = dat2; } break; default: if(!getv) //根据getv的值判断是第一个数据还是第二个数据！ { dat1 = dat1*10 + getk; //将按键值组合成为数据 temp = dat1; } else { dat2 = dat2*10 + getk; temp = dat2; } break; } } } } else keypress = 1; } //填充disp_buffer 浮点数数据处理 转换为整数，并标记小数点位置 uchar float_int_dot(float numf) { uchar ct,ctn,dotps; for(ct = 7 ; ct != 0 ; ct--) //初始化打印缓冲区和显示缓冲区 { buf[ct - 1] = 0; if(ct - 1 > 0) disp_buffer[ct - 2] = 16; } sprintf(buf,"%f",numf); for(ct = 7 ,ctn = 5; ct != 0 ; ct--) { if(buf[ct-1] == '.') //如果是小数点则记录位置，并传递给返回值 { dotps = 6 - ctn; disp_buffer[ctn] = 0; } else if(buf[ct - 1] != '0')//不等于0 则将ascii转换为数值填充入显示缓冲区， { disp_buffer[ctn] = buf[ct - 1] - 0x30; ctn--; } } return dotps; } //填充disp_buffer ，数据处理 void p_data(long dat) { uchar pi; for(pi = 0 ; pi < 6 ; pi++) { if(dat != 0 ) { disp_buffer[5 - pi] = dat%10; } else disp_buffer[5 - pi] = 16; dat = dat/10; } } //显示子程序 void display(uchar flash , uchar count, uchar dot) //dot 代表现实小数点的位置 { uchar i,temp; temp = 0x01; for(i=0;i<6;i++) { P2 = temp; //位选 if(!(flash&0x01)) { if(count <50) P0 = Tab[disp_buffer[i]]; //送显示段码 else P0 = 0; //送显示段码 } else P0 = Tab[disp_buffer[i]]; //送显示段码 flash = flash >> 1; if(dot - 1 == 5 - i) P0 = P0|0x80; delay(2); P0 = 0x00; //消隐 temp = _crol_(temp,1); } } //主函数 void main() { uchar dot; while(1) { keyscan(); dot = float_int_dot(temp); display(0xff,100,dot); //11 001101 } } Proteus 仿真图
