51单片机实现计算器，可带小数

#include <reg52.h> #include "anjian.h" /*数码管位选io口*/ sbit x = P2^2; sbit y = P2^3; sbit z = P2^4; char code smgduan[16] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71};/*0~15的显示*/ char code smgxiaoshu[10] = {0xbf, 0x86, 0xdb, 0xcf, 0xe6, 0xed, 0xfd, 0x87, 0xff, 0xef};/*0~9带小数点*/ void Smgxy(); void SMG(int a, int b)/*数码管组函数*/ { Smgxy(); delay(5); switch(a) { case(1): x = 0; y = 0; z = 0; break; case(2): x = 1; y = 0; z = 0; break; case(3): x = 0; y = 1; z = 0; break; case(4): x = 1; y = 1; z = 0; break; case(5): x = 0; y = 0; z = 1; break; case(6): x = 1; y = 0; z = 1; break; case(7): x = 0; y = 1; z = 1; break; case(8): x = 1; y = 1; z = 1; break; }/*位选完成*/ P0 = smgduan[b]; delay(150); } void Smgxy()/*数码管消影*/ { int a = 8; for(a; a > 0; a--) { switch(a) { case(1): x = 0; y = 0; z = 0; break; case(2): x = 1; y = 0; z = 0; break; case(3): x = 0; y = 1; z = 0; break; case(4): x = 1; y = 1; z = 0; break; case(5): x = 0; y = 0; z = 1; break; case(6): x = 1; y = 0; z = 1; break; case(7): x = 0; y = 1; z = 1; break; case(8): x = 1; y = 1; z = 1; break; }/*位选完成*/ P0 = 0x00; } } void smg_W(int a) { Smgxy(); switch(a) { case(1): x = 0; y = 0; z = 0; break; case(2): x = 1; y = 0; z = 0; break; case(3): x = 0; y = 1; z = 0; break; case(4): x = 1; y = 1; z = 0; break; case(5): x = 0; y = 0; z = 1; break; case(6): x = 1; y = 0; z = 1; break; case(7): x = 0; y = 1; z = 1; break; case(8): x = 1; y = 1; z = 1; break; }/*位选完成*/ } void smg_D(float c)/*多个数码管显示*/ { if (c == 0) { smg_W(1); P0 = 0x3f; } /*正数*/ if (c > 0) { int a;/*计算几位小数*/ int d; int b; long int Z; float X; long int C; Z = (long int)(c - 0); X = c - Z; if (Z > 0) { while (X > 0) { c = c * 10; Z = (long int)(c - 0); X = c - Z; a++; if (a > 4)/*限制小数后几位*/ { break; } } b = a - 1; C = (long int)(c - 0); for (a; a > 1; a--) { C = C; } for (d = 1; C > 0; d++) { SMG(d, C % 10); if (d == b + 1) { smg_W(d); P0 = smgxiaoshu[C % 10]; } C = C / 10; } } if (Z == 0) { while (X > 0) { c = c * 10; Z = (long int)(c - 0); X = c - Z; a++; if (a > 4)/*限制小数后几位*/ { break; } } b = a - 1; C = (long int)(c - 0); for (a; a > 1; a--) { C = C; } for (d = 1; C > 0; d++) { SMG(d, C % 10); C = C / 10; } smg_W(d); P0 = smgxiaoshu[0]; } }/*end of */ /*负数*/ if (c < 0) { int a;/*计算几位小数*/ int d; int b; long int Z; float X; long int C; c = -c; Z = (long int)(c - 0); X = c - Z; if (Z > 0) { while (X > 0) { c = c * 10; Z = (long int)(c - 0); X = c - Z; a++; if (a > 4)/*限制小数后几位*/ { break; } } b = a - 1; C = (long int)(c - 0); for (a; a > 1; a--) { C = C; } for (d = 1; C > 0; d++) { SMG(d, C % 10); if (d == b + 1) { smg_W(d); P0 = smgxiaoshu[C % 10]; } C = C / 10; } smg_W(d); P0 = 0x40; }/*end of */ if (Z == 0) { while (X > 0) { c = c * 10; Z = (long int)(c - 0); X = c - Z; a++; if (a > 4)/*限制小数后几位*/ { break; } } b = a - 1; C = (long int)(c - 0); for (a; a > 1; a--) { C = C; } for (d = 1; C > 0; d++) { SMG(d, C % 10); C = C / 10; } smg_W(d); P0 = smgxiaoshu[0]; delay(150); smg_W(d + 1); P0 = 0x40; } } delay(150); Smgxy(); }