C++ 14我的程序没有返回预期的结果

问题描述：

#include <stdio.h> 
#include <stdlib.h> 


int main() 
{ 
    //You are in the elevator now; 

    //Define variables; 
    char a; 
    char b; 

    //Ask questions; 
    printf("You are in the elevator now.\nPlease enter which floor you want to visit?\nPress 'L' for Basement, '1' for 1st floor, '2' for 2nd floor, and '3' for 3rd floor:\n"); 
    scanf("%c", &a); 

    //Display options; 
    if (a=='L'){ 
     printf("You are at the basement now.\n", a); 

    scanf("%c", &b); 
     printf("Where do you want to go?\nOnly Option is 'P' for Parking lot:\n"); 

     else (b=='P') 

      printf("You are in the Parking Lot now.\n", b); 
    } 

    else if (a=='1') 
     printf("You are at the main floor now.\n", a); 

    else if (a=='2') 
     printf("You are at the Mechanical Department now.\n", a); 

    else if (a=='3') 
     printf("You are at the Electrical Department now.\n", a); 

    else{ 
     printf("It's not an option\n"); 
    } 

}

对于用户选择P之后的第一个选项L，我得到的命令没有找到。我应该得到你现在在停车场。我不确定是什么导致了这一点。C++ 14我的程序没有返回预期的结果

对不起，我多次提出问题 – Wilson

我遇到了我的电脑问题 – Wilson

为什么你不断添加随机编辑？ – yizzlez

答

在条件语句中有三个等号。

b ===代替b == 'P'

@ sgabhart22我仍然得到命令没有找到:( – Wilson

我感谢你的帮助 – Wilson

还有什么呢？ – Wilson

答

'P' 替换

else (b==='P')

通过

if (b == 'P')

更好的是，添加花括号 – Carcigenicate

答

检查这个代码了...

#include <iostream> 
using namespace std; 
int main() 
{ 
//You are in the elevator now; 
//Define variables; 
char a; 
char b; 

//Ask questions; 
printf("You are in the elevator now.\nPlease enter which floor you want to visit?\nPress 'L' for Basement, '1' for 1st floor, '2' for 2nd floor, and '3' for 3rd floor:\n"); 
scanf("%c", &a); 

//Display options; 
if (a=='L') 
{ 
     printf("You are at the basement now.\n"); 
     printf("Where do you want to go?\nOnly Option is 'P' for Parking lot:\n"); 
     cin >> b; 
     if (b=='P'){ 
     printf("You are in the Parking Lot now.\n");} 
} 

else if (a=='1') 
    printf("You are at the main floor now.\n"); 

else if (a=='2') 
    printf("You are at the Mechanical Department now.\n"); 

else if (a=='3') 
    printf("You are at the Electrical Department now.\n"); 

else 
    printf("It's not an option\n"); 
return 0; 
}

@ Karthik Chowdary在用户放入L和P之后，编译器显示P命令未找到 – Wilson

答

您可能遇到的主要问题是scanf("%c")只消耗一个字符，并且在按下输入后，缓冲区中将有一个'\n'。你可能会想一些其他方式的输入，如使用类似：

std::string command; 
std::cin >> command; 
if (command == "P") { 
    // ... 
}

因为这将在默认情况下，在一次加载整个空白 - 划定的字符串。

C++ 14我的程序没有返回预期的结果

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