What's the difference between conditional statements and loop statements?
This article shares with you what is the difference between conditional statements and circular statements. Xiaobian thinks it is quite practical, so share it with you to learn. I hope you can gain something after reading this article. Let's not say much. Let's take a look at it together with Xiaobian.
conditional statement IF statement
IF conditional statement syntax format is as follows:
if(condition)
action
You can also use braces to perform a set of operations:
if(condition)
{
action-1
action-1
.
.
action-n
}
The following examples are used to determine whether a number is odd or even:
$awk'BEGIN{num=10;if(num%2==0)printf"%d is even\n",num}'
The output is:
10 is an even number.
IF-ELSE statement
IF-ELSE conditional statement syntax format is as follows:
if(condition)
action-1
else
action-2
Only action-1 is required if condition is true, otherwise action-2 is executed.
$awk'BEGIN{
num=11;
if(num%2==0)printf"%d is even\n",num;
elseprintf"%d is odd\n",num
}'
The output is:
11 is odd.
IF-ELSE-IF
We can create multiple IF-ELSE statements to determine multiple conditions:
$awk'BEGIN{
a=30;
if(a==10)
print"a=10";
elseif(a==20)
print"a=20";
elseif(a==30)
print"a=30";
}'
The output is:
a=30
cycle
For
The syntax for a For loop is as follows:
for(initialisation;condition;increment/decrement)
action
The for statement first performs an initialization and then checks the condition. If the condition is true, an action is performed, followed by an increment or decrement operation. As long as the condition is true, the loop will execute. At the end of each loop, the condition is checked, and if the condition is false, the loop ends.
The following example uses the For loop to output numbers 1 to 5:
$awk'BEGIN{for(i=1;i
