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👉You may encounter situations, when a block of code needs to be
executed several number of times. In general, statements are executed
sequentially: The first statement in a function is executed first, followed by
the second, and so on.
👉Programming languages provide various control structures that
allow for more complicated execution paths.
👉A loop statement allows us to execute a statement or group of
statements multiple times. Given below is the general form of a loop statement
in most of the programming languages −
👉C programming language
provides the following types of loops to handle looping requirements.
Sr.No.
|
Loop Type & Description
|
1
|
Repeats
a statement or group of statements while a given condition is true. It tests the
condition before executing the loop body.
|
2
|
Executes
a sequence of statements multiple times and abbreviates the code that manages
the loop variable.
|
3
|
It
is more like a while statement, except that it tests the condition at the end
of the loop body.
|
4
|
You
can use one or more loops inside any other while, for, or do..while loop.
|
Flow Diagram of For loop:
Step 1: First initialization happens and the
counter variable gets initialized.
Step 2: In the second step the condition is checked, where the counter variable is tested for the given condition, if the condition returns true then the C statements inside the body of for loop gets executed, if the condition returns false then the for loop gets terminated and the control comes out of the loop.
Step 3: After successful execution of statements inside the body of loop, the counter variable is incremented or decremented, depending on the operation (++ or –).
Step 2: In the second step the condition is checked, where the counter variable is tested for the given condition, if the condition returns true then the C statements inside the body of for loop gets executed, if the condition returns false then the for loop gets terminated and the control comes out of the loop.
Step 3: After successful execution of statements inside the body of loop, the counter variable is incremented or decremented, depending on the operation (++ or –).
Main Types
of Loop:
1) While Loop:
While(Condition)
{
Printf (“Statement”);
Increment/Decrement;++/--;
}
2) Do While Loop:
do
{
Printf (“Statement”);
Increment/Decrement;
} While(Condition);
3) For Loop:
For(Initialization;condition;increment/decrement)
{
Printf(“Statement”);
}
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