实现买菜功能（未完成代码）

<span style="font-family: Arial, Helvetica, sans-serif;">#include "stdafx.h"</span>

#include <windows.h>#define PRICEOFARTICHOKES_PERPOUND 1.255#define PRICEOFBEET_PERPOUND 0.65#define PRICEOFCARROT_PERPOUND 0.89float get_the_price_artichokes(float f){float price;price = 0;if (f<5){price = 3.5 + f*PRICEOFARTICHOKES_PERPOUND;}else if (f<20&&f>=5){price = 10 + f*PRICEOFARTICHOKES_PERPOUND;}else{price = 8 + f*PRICEOFARTICHOKES_PERPOUND+0.1*f;}if (price>100){price = price*0.95;}return price;}float get_the_price_beets(float f){float price;price = 0;if (f<5){price = 3.5 + f*PRICEOFBEET_PERPOUND;}else if (f<20 && f >= 5){price = 10 + f*PRICEOFBEET_PERPOUND;}else{price = 8 + f*PRICEOFBEET_PERPOUND + 0.1*f;}if (price>100){price = price*0.95;}return price;}float get_the_price_carrots(float f){float price;price = 0;if (f<5){price = 3.5 + f*PRICEOFCARROT_PERPOUND;}else if (f<20 && f >= 5){price = 10 + f*PRICEOFCARROT_PERPOUND;}else{price = 8 + f*PRICEOFCARROT_PERPOUND + 0.1*f;}if (price>100){price = price*0.95;}return price;}int _tmain(int argc, _TCHAR* argv[]){float a, b, c,p,f;char q;char ch;a = 0; b = 0; c = 0;p = 0;ch = ' ';while (ch!='q'){printf("a. input the pounds of artichokes \n");printf("b. input the pounds of beets \n");printf("c. input the pounds of carrots \n");printf("q. quit \n");scanf("%c", &ch);getchar();printf("input the pounds:\n");scanf("%f", &f);switch (ch){case 'a': a =a+ get_the_price_artichokes(f); break; case 'b': b =b+ get_the_price_beets(f); break;case 'c': c =c+ get_the_price_carrots(f); break;}p = p + a + b + c;printf("the price is %f \n", p);}system("pause");return 0;}

初步构想

#define PRICEOFARTICHOKES_PERPOUND 1.255#define PRICEOFBEET_PERPOUND 0.65#define PRICEOFCARROT_PERPOUND 0.89

这三个功能表示每磅的价格，然后将其写入到对应的函数中

float get_the_price_artichokes(float f)

float get_the_price_beets(float f)

float get_the_price_carrots(float f)

也就是这三个函数，返回的值是根据折扣类型和售价得到的数，float型直接得到对应菜的总价，输入是菜的重量，定义一个float型

实际运行时发现循环有问题。

改错版本1

#include "stdafx.h"#include <windows.h>#define PRICEOFARTICHOKES_PERPOUND 1.255#define PRICEOFBEET_PERPOUND 0.65#define PRICEOFCARROT_PERPOUND 0.89float get_the_price_artichokes(float f){float price;price = 0;if (f<5){price = 3.5 + f*PRICEOFARTICHOKES_PERPOUND;}else if (f<20&&f>=5){price = 10 + f*PRICEOFARTICHOKES_PERPOUND;}else{price = 8 + f*PRICEOFARTICHOKES_PERPOUND+0.1*f;}if (price>100){price = price*0.95;}return price;}float get_the_price_beets(float f){float price;price = 0;if (f<5){price = 3.5 + f*PRICEOFBEET_PERPOUND;}else if (f<20 && f >= 5){price = 10 + f*PRICEOFBEET_PERPOUND;}else{price = 8 + f*PRICEOFBEET_PERPOUND + 0.1*f;}if (price>100){price = price*0.95;}return price;}float get_the_price_carrots(float f){float price;price = 0;if (f<5){price = 3.5 + f*PRICEOFCARROT_PERPOUND;}else if (f<20 && f >= 5){price = 10 + f*PRICEOFCARROT_PERPOUND;}else{price = 8 + f*PRICEOFCARROT_PERPOUND + 0.1*f;}if (price>100){price = price*0.95;}return price;}int _tmain(int argc, _TCHAR* argv[]){float a, b, c,p,f;char q;char ch;a = 0; b = 0; c = 0;p = 0;ch = ' ';printf("a. input the pounds of artichokes \n");printf("b. input the pounds of beets \n");printf("c. input the pounds of carrots \n");printf("q. quit \n");scanf("%c", &ch);while (ch!='q'){switch (ch){case 'a':printf("input the pounds:\n");scanf("%f", &f); a = a + get_the_price_artichokes(f); ch = ' '; break;case 'b': printf("input the pounds:\n");scanf("%f", &f);b = b + get_the_price_beets(f); ch = ' '; break;case 'c': printf("input the pounds:\n");scanf("%f", &f); c = c + get_the_price_carrots(f); ch = ' '; break;default: break;}printf("a. input the pounds of artichokes \n");printf("b. input the pounds of beets \n");printf("c. input the pounds of carrots \n");printf("q. quit \n");scanf("%c", &ch);}p = a + b + c;printf("the price is %f \n", p);system("pause");return 0;}

实现买菜功能