Question

我的编程和逻辑入门课程的最终实验将不会执行，它在屏幕上快速闪烁CMD，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提示输入数字操作选择菜单从数组中打印具有指定名称的结果

实际-快速CMD窗口闪烁然后什么也没有

Answer 1

这听起来像是您在某种目录列表中双击该程序，该程序在命令窗口中启动该程序，然后立即将其关闭-没有时间让您看到它显示的消息。解决方案一定是打开您自己的命令窗口，然后在提示符下键入perl your_program_name.pl。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。

（但是，如果我不得不猜测，我建议问题出在定义@username的那一行中的“智能引号”。）

带有数组作业问题的简单菜单无法执行

1 个答案: