Perl |标量-yiteyi-C++库

标量是一次存储单个数据单元的变量。标量变量存储的数据可以是不同类型的数据，如字符串、字符、浮点、大量字符串，也可以是网页等。 例子：

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Perl

                         # Perl program to demonstrate                       
                         # scalars variables                       
           
                         # a string scalar                       
                         $name                                     =                                     "Alex"                                     ;                       
           
                         # Integer Scalar                       
                         $rollno                                     = 13;                       
           
                         # a floating point scalar                       
                         $percentage                                     = 87.65;                       
           
                         # to display the result                       
                         print                                     "Name = $name"                                     ;                       
                         print                                     "Roll number = $rollno"                                     ;                       
                         print                                     "Percentage = $percentage"                                     ;                       

输出：

Name = AlexRoll number = 13Percentage = 87.65

数值标量

数值标量变量包含整数、整数（正负）、浮点（包含小数点）等值。下面的示例演示perl中不同类型的数值标量变量。 例子：

Perl

                         # Perl program to demonstrate various types                       
                         # of numerical scalar variables                       
           
                         # Positive integer numerical                       
                         # scalar variables                       
                         $intpositive                                     = 25;                       
           
                         # Negative integer numerical                       
                         # scalar variables                       
                         $intnegative                                     = -73;                       
           
                         # Floating point numerical                       
                         # scalar variables                       
                         $float                                     = 23.5;                       
           
                         # In hexadecimal form                       
                         $hexadec                                     = 0xcd;                       
           
                         # to display the result                       
                         print                                     "Positive Integer = $intpositive"                                     ;                       
                         print                                     "Negative Integer = $intnegative"                                     ;                       
                         print                                     "Floating Point = $float"                                     ;                       
                         print                                     "Hexadecimal Form = $hexadec"                                     ;                       

输出：

Positive Integer = 25Negative Integer = -73Floating Point = 23.5Hexadecimal Form = 205

弦标量

字符串标量变量包含一个单词（由不同字符组成）、一组单词或一个段落等值。下面的示例演示了不同类型的字符串标量变量。 例子：

Perl

                         # Perl program to demonstrate various types                       
                         # of string scalar variables                       
           
                         # String scalar                       
                         $alphastring                                     =                                     "GeeksforGeeks"                                     ;                       
                         $numericstring                                     =                                     "17"                                     ;                       
                         $alphanumeric                                     =                                     "gfg21"                                     ;                       
           
           
                         #special character in string scalar                       
                         $specialstring                                     =                                     "^gfg"                                     ;                       
           
                         # in single quotes                       
                         $singlequt                                     =                                     'Hello Geeks'                                     ;                       
           
                         # To display the result                       
                         print                                     "String with alphabets = $alphastring"                                     ;                       
                         print                                     "String with numeric values = $numericstring"                                     ;                       
                         print                                     "String with alphanumeric values = $alphanumeric"                                     ;                       
                         print                                     "String within Single quotes = $singlequt"                                     ;                       
                         print                                     "String with special characters = $specialstring"                                     ;                       

输出：

String with alphabets = GeeksforGeeksString with numeric values = 17String with alphanumeric values = gfg21String within Single quotes = Hello GeeksString with special characters = ^gfg

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