Perl cmp 操作符

Perl中的cmp运算符是一个字符串等价比较运算符，用于比较在该运算符左右两边的两个字符串是否相等或小于另一个。

语法： string1 cmp string2

返回： 如果string1小于，则返回 -1；如果等于，则返回 0；如果大于string2，则返回 1。

例1： 当String1小于String2时

#!/usr/local/bin/perl
  
# Initializing strings
a = "Geeks";b = "Welcome";
  
# Comparing strings
c =a cmp b;
  
# Printing the comparison result
print("Comparison of \$a and \$b returnsc");

输出。

Comparison of a andb returns -1

例2：当String1等于String2时

#!/usr/local/bin/perl
  
# Initializing strings
a = "Welcome";b = "Welcome";
  
# Comparing strings
c =a cmp b;
  
# Printing the comparison result
print("Comparison of \$a and \$b returnsc");

输出。

Comparison of a andb returns 0

例3：当String1大于String2时

#!/usr/local/bin/perl
  
# Initializing strings
a = "Welcome";b = "Geeks";
  
# Comparing strings
c =a cmp b;
  
# Printing the comparison result
print("Comparison of \$a and \$b returnsc");