ruby-Numbers & Strings

=begin         #字符串          #数字, Several classes of numbers:   fixnum: The largest integer value that the native machine byte can store, and  bignum: An integer value that exceeds the maximum integer value that can be stored by the native machine byte;   float: Stores floating-point types;  bigdecimal: Provides a floating-point number type of arbitrary precision;  numeric: All numbers of sub-classes, all other numeric types =end# strings of some basic methods p  "string"               #输出结果为: "String" p  "string"   * 2         #输出结果为: "stringstring" p  "String"  +  "Class"    #输出结果为: "Stringclass" "a". ord           # Gets the ASCII encoding of the first character of the string: "A"  <  "B"          # Compare the size of ASCII on both sides: true "WA"  =~ /a/        #用正则匹配字符在字符串中的位置, starting bit 0:1# Some basic methods of number types 5.times { |x| puts x }           #使用   Number of times method, output from 0 to 4 a large five number: 0\n1\n2\n3\n4\n5.times { puts  "a"  }            #使用   times .times  method, will "a" continuous output five times: A\na\na\na\na\n5.upto (Ten)  { |x| puts x   }      #使用   Start value. Upto (end value)   method for controlling the output range: 5\n6\n7\n8\n9\n10\n10.downto (5)  { |x| puts x }     #使用   End value. Downto (initial value)   Reverse output: 10\n9\n8\n7 \n6\n5\n15.step (50, 8)  { |x| puts x }   #使用   initial value. Step (end value,  stepping value) )   output result, result less than equals end value: 15\n23\n31\n39\n47\n#bigdecimal usage require  ' BigDecimal ' a = bigdecimal.new ( "0.07") p  (a * 100). to_i

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ruby-Numbers & Strings