Introduction and usage of Perl conditional Control
This article mainly explains "Introduction and usage of Perl conditional control". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "Introduction and Usage of Perl Conditional Control"!
Condition control:
if and unless
Cycle control:
for and foreach
while and until
next and last
Use of if:
if(condition){action;} #condition is true, execute action
if(condition 1){
Action 1; #Condition 1 is true, perform action 1
}else{Action 2;} #Otherwise, perform Action 2
if(condition 1){
Action 1; #Condition 1 is true, perform action 1
}elsif(Condition 2){ #Otherwise Condition 2 is true, perform action 2
Operation 2;
}else{Action 3;} #Otherwise, execute Condition 3
Unless the usage:
unless(condition){action;} #If condition is false, perform action
if(1>2){
print"1 > 2\n";
}else{
print"1 2 ?\ N"; #Display: 1>2?
}
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