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perl - 带有数组作业问题的简单菜单不会执行

问题描述

我的编程和逻辑介绍课程的最后一个实验将无法执行，它在屏幕上快速显示 CMD 闪存然后什么也没有发生。我不确定这是语法错误还是什么。非常感谢您的帮助。 

#Part 2 Insert 1.0
@username=(“first”,“last”);
print "Please enter your first name: ";
$username[0] = <STDIN>;
chomp $username[0];

print "Please enter your last name: ";
$username[1] = <STDIN>;
chomp $username[1];

print "Your name is:\n";
print "$username[0]\n$username[1]\n";

print "Please enter a number\n";
$number1 = <STDIN>;
chomp $number1;
#Part 2 Insert 1.0 - END


print "Please enter a second number\n";
$number2 = <STDIN>;
chomp $number2;

while ( $number2 == 0 )
{
  print "You entered $number2\nPlease enter a non-zero number\n";
  $number2 = <STDIN>;
  chomp $number2;
}

print "Please enter your first name\n";
$name=<STDIN>;
chomp $name;

print "$name, how many times do you want to run your program?\n";
$total_loops=<STDIN>;
chomp $total_loops;

print "\n$name, you entered $number1 and $number2\n";

for($ctr=1; $ctr <= $total_loops; $ctr++)
{
  print("\nDisplaying $ctr of $total_loops loops \n\n");
  print("Please make a selection using the menu below\n");
  print "1 - Subtract \n";
  print "2 - Divide\n";
  print "3 - Modulus\n";
  print "4 - Exit\n";
  $answer = <STDIN>;
  chomp $answer;

#next line edited to use lab4 part 2 array
  print "$username[0] $username[1] You selected $answer as your menu choice\n\n";

if($answer == 1)
{
  $sub = $number1 - $number2;
  print("$number1 - $number2 is $sub");
 }
elsif($answer == 2)
{
  $quot = $number1/$number2;
  print "$number1 / $number2 is $quot";
}
elsif($answer == 3)
{
   $mod=$number1 % $number2;
   print "$number1 % $number2 is $mod";
 }
elsif($answer == 4)
{
    print "Exiting program";
    exit 0;
 }
else
 {
    print "$answer is not a valid menu choice! Please retry.";
  }
  print ("\n"); #blank line
}

预期 - 提示输入名称并分配给数组

实际 - 快速 CMD 窗口闪烁然后什么都没有

标签： perl

解决方案

听起来您正在双击某种目录列表中的程序，该程序在命令窗口中启动程序然后立即关闭 - 没有给您时间查看它显示的消息。当然，解决方案是打开您自己的命令窗口，然后perl your_program_name.pl在提示符下键入。当程序退出时，已经打开的命令窗口不会关闭，您将能够看到错误。

（但如果我不得不猜测，我建议问题出在您定义的行中的“智能引号” @username。）

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