Question

我开发了简单的控制台菜单程序，可以对键盘输入做出反应。

#include <iostream>
#include <cstdio>

using namespace std;


char* main_menu[] =
  {
    "1 - selection 1",
    "2 - selection 2",
    "3 - selection 3",
    "4 - selection 4",
    "q - quit",
    NULL
  };


char* menu2[] =
  {
    "a - selection a",
    "b - selection b",
    "c - selection c",
    NULL
  };


int getChoice( char* greet, char* choices[] )
{
  int chosen = 0;
  int selected;
  char** option;

  do
    {
      printf( "Choice: %s\n", greet );
      option = choices;
      while (*option)
    {
      printf( "%s\n", *option );
      option++;
    }
      do
    {
      selected = getchar();
      printf( "selected: %c\n", selected );
    } while ( selected=='\n' );
      option = choices;
      while (*option)
    {
      if ( selected == *option[0] )
        {
          chosen = 1;
          break;
        }
      option++;
    }
      if ( !chosen )
    {
      printf( "Incorrect choice, select again\n" );
    }
    } while( !chosen );
  return selected;
}

int getAmount( char* greet )
{
  int amount = 0;
  printf( "%s\n", greet );
  scanf("%d", &amount);
  return amount;
}




int main(int argc, char **argv, char **envp)
{
int choice = 0;
  do
    {
      choice = getChoice( "Please select an action", main_menu );
      printf( "You have chosen: %c\n", choice );

    if ( choice == '1' )
    {
    printf( "choise 1");
    }
      else if ( choice == '2' )
    {
    printf( "choise 2");
    }
      else if ( choice == '3' )
    {

      int a = 0;
      a = getAmount( "type int value" );
      printf( "choise 3 entered %d",a);
    }
      else if ( choice == '4' )
    {
      int choice2 = 0;
      choice2 = getChoice( "Please select an action", menu2 );
      printf( "You have chosen: %c\n", choice2 );

      if ( choice2 == 'a' )
        {
          printf( "choise a");
        }
      else if ( choice2 == 'b' )
        {
          printf( "choise b");
        }
      else if ( choice2 == 'c' )
        {
          printf( "choise c");
        }
    }
    } while ( choice != 'q' );
  }

我想传递一系列密钥以便测试它。我在bash中运行命令并期望按键1：

echo 1 | ./selector

但是得到了非连续循环的垃圾字符：选择：请选择一个动作

1 - selection 1
2 - selection 2
3 - selection 3
4 - selection 4
q - quit
selected: �
Incorrect choice, select again
Choice: Please select an action
1 - selection 1
2 - selection 2
3 - selection 3
4 - selection 4
q - quit
selected: �
Incorrect choice, select again
Choice: Please select an action

我的命令或程序有什么问题？

Answer 1

问题是，您没有检查文件结尾。

selected = getchar();

应该是这样的：

if ((selected = getchar())== EOF){exit(0);}

将键盘输入仿真传递给控制台应用程序

1 个答案: