একই জিনিস বারংবার ( looping ) করতে হলে কি করতে হবে ?

CLASS 7 - Doing the Same Thing Over and Over

In the previous lessons, you've learned the basics of the C program, several important C functions, standard I/O, and some useful operators. In this lesson you'll learn a very important feature of the C language—looping. Looping, also called iteration, is used in programming to perform the same set of statements over and over until certain specified conditions are met.

Three statements in C are designed for looping:

The for statement
The while statement
The do-while statement

Summary
In this lesson you've learned the following:

Looping can be used to perform the same set of statements over and over until specified conditions are met.
Looping makes your program concise.
There are three statements, for, while, and do-while, that are used for looping
in C.
There are three expression fields in the for statement. The second field contains the expression used as the specified condition(s).
The for statement does not end with a semicolon.
The empty for( ; ; ) statement can be used to form an infinite loop.
Multiple expressions, separated by commas, can be used in the for statement.
There is only one expression field in the while statement, and the expression is used as the specified condition.
The while statement does not end with a semicolon.
The while (1) statement can create an infinite loop.
The do-while statement places its expression at the bottom of the loop.
The do-while statement does end with a semicolon.
The inner loop must finish first before the outer loop resumes its iteration in nested loops.

In the next lesson you'll learn about more operators used in the C language.

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Adding More Expressions into for

Adding More Expressions into for

The C language allows you to put more expressions into the three expression fields in the for statement. Expressions in a single expression field are separated by commas.

The Null Statement

The Null Statement

Looping Under the for Statement

Looping Under the for Statement

The general form of the for statement is

for (expression1; expression2; expression3) { statement1; statement2; . . . }

Using Nested Loops

Using Nested Loops

You can put a loop inside another one to make nested loops. The computer will run the inner loop first before it resumes the looping for the outer loop.

Listing 7.7 is an example of how nested loops work.

The do-while Loop

The do-while Loop

You may note that in the for and while statements, the expressions are set at the top of the loop. However, in this section, you're going to see another statement used for looping,