1) Like all loops, "for loops" execute blocks of code over and over again.
2) The advantage to a for loop is we know exactly how many times the loop will execute before the loop starts.
Syntax
for(initialization; condition; increment/decrement)
{
Statements;
}Example:
for(i=0;i<=5;i++)
{
statements;
}Flow chart of for loop:
In the following flowchart is draw similar to the above example, don't forget to see the whole explanation about the flowchart.
Step 1:
Start Initialization, if you want to initialize any value you can assign here this is optional.
Step 2:
Conditions are return true or false value this also optional, some examples are
Conditions
3>5 => return False
6<=6 => return True
3==3 => return True
Symbols
< => Less than
> => Greater than
= => Equal
<= => less than or equal
>= => greater than or equal
! => Not
!= => Not equal
If true then inside the for loop statements executed.
Step 3:
Statement, in this part have any type of statements like alert, function calling, if, for and etc. Then next it will go to increments/Decrements part.
Step 4:
Increment/Decrements this is also optional and here we can increase or decrease the value. Then go to check the condition again.
Step 5:
Condition again check and repeat the process again, when the condition is return false value the control will go to Next Statements.
for(i=0;i<=5;i++)
{
alert(i);
}Below I write all the execution steps, if you new to for loop please watch all steps.
start
i=0
i<=5 (0<=5) => True
alert the i value (alert 0)
i++ [i=i+1] (i=0+1) [i=1]
i<=5 (1<=5) => True
alert 1
i++ (i=1+1) [i=2]
i<=5 (2<=5) => True
alert 2
i++ (i=2+1) [i=3]
i<=5 (3<=5) => True
alert 3
i++ (i=3+1) [i=4]
i<=5 (4<=5) => True
alert 4
i++ (i=4+1) [i=5]
i<=5 (5<=5) => True
alert 5
i++ (i=5+1) [i=6]
i<=5 (6<=5) => False
Then go to outside of the for loop.
i=0
i<=5 (0<=5) => True
alert the i value (alert 0)
i++ [i=i+1] (i=0+1) [i=1]
i<=5 (1<=5) => True
alert 1
i++ (i=1+1) [i=2]
i<=5 (2<=5) => True
alert 2
i++ (i=2+1) [i=3]
i<=5 (3<=5) => True
alert 3
i++ (i=3+1) [i=4]
i<=5 (4<=5) => True
alert 4
i++ (i=4+1) [i=5]
i<=5 (5<=5) => True
alert 5
i++ (i=5+1) [i=6]
i<=5 (6<=5) => False
Then go to outside of the for loop.
Example Program:- (Editor)
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for loop in allinworld99, for loop in javascript, for loop in c, for loop in c++ cpp, learn for loop in allinworld99
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