什么是错的，在我的程序scanfs和/或IFS（咖啡店） [英] Something is wrong with the scanfs and/or ifs in my program (Coffee shop)

问题描述

标题谈到了这个问题。

#include<stdio.h>
#include<conio.h>
main(){
char order, coffee, size, affirm;
float price;
clrscr();
printf("Hello, welcome to C Coffee Shop. How may I help you?\n");
printf(">Buy = B\n>Nothing = N\n"); /* Choose action */
scanf("%c",&order);
if(order == 'B'){ /* Decided to buy coffee */
  printf("What coffee would you want for today?\n"); /* Decide coffee type */
  printf(">Espresso = E\n>Americano = A\n>Latte = L\n");
  scanf("%c",&coffee);
  printf("How large would your drink be?\n"); /* Decide coffee size */
  printf(">Petite = P\n>Regular = R\n>Tall = T\n");
  scanf("%c",&size);
  if((coffee == 'E') && (size == 'P')){ /* Petite Espresso */
    price = 35;
    }
  else if((coffee == 'E') && (size == 'R')){ /* Regular Espresso */
    price = 50;
    }
  else if((coffee == 'E') && (size == 'T')){ /* Tall Espresso */
    price = 75;
    }
  else if((coffee == 'A') && (size == 'P')){ /* Petite Americano */ 
    price = 45;
    }
  else if((coffee == 'A') && (size == 'R')){ /*Regular Americano */
    price = 65;
    }
  else if((coffee == 'A') && (size == 'T')){ /* Tall Americano */
    price = 90;
    }
  else if((coffee == 'L') && (size == 'P')){ /* Petite Latte */
    price = 60;
    }
  else if((coffee == 'L') && (size == 'R')){ /* Regular Latte */
    price = 85;
    }
  else if((coffee == 'L') && (size == 'T')){ /* Tall Latte */
    price = 110;
    }
  printf("To clarify, your order is %c %c.\nThat would be %0.2f pesos.\n", size, coffee, price); /* Verify order */
  printf(">OK = O\n"); /* Affirm */
  scanf("%c",&affirm);
  if(affirm == 'O'){ /* Accept order */
    printf("Processing order...\n");
    }
  else{ /* Discard order */
    printf("Discarding order...\n");
    }
  printf("Thank you! Please come again.");
  }
else if(order == 'N'){ /* Decided not to buy coffee */
  printf("Thank you! Please come again.");
  }
getche();
return 0;
}

当我尝试运行该程序时，行11 - 16出现不休息，从执行其他命令禁止我。我认为这是无论是在我的scanf函数的误用（）或if-else语句。我不知道如何解决，虽然它。帮助，好吗？

When I try to run the program, the lines 11 - 16 appear without break, disabling me from executing the other commands. I think it's either in my misapplication of scanf() or if-else statements. I don't know how to solve it though. Help, please?

if(order == 'B'){
  printf("What coffee would you want for today?\n");
  printf(">Espresso = E\n>Americano = A\n>Latte = L\n");
  scanf("%c",&coffee);
  printf("How large would your drink be?\n");
  printf(">Petite = P\n>Regular = R\n>Tall = T\n");
  scanf("%c",&size);

也请告诉我，如果有我的code其它任何错误。 Tysm那些谁可以帮助：>

Please also tell me if there is any other mistakes in my code. Tysm to those who will help :>

推荐答案

无论你输入的字符，如

scanf("%c",&coffee);

加一个空格的格式规范的面前，就像

put a space in front of the format spec, like

scanf(" %c",&coffee);

这将导致留在输入缓冲器，例如换行 A previous输入后，要跳过的，而不是被任何previous空白阅读作为字符。

This will cause any previous whitespace left in the input buffer, such as the newline after a previous input, to be skipped, instead of being read as that char.

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