While Statement Dev C++

 
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C while and do.while Loop Loops are used in programming to repeat a specific block of code. In this article, you will learn to create while and do.while loops in C programming. Any statement, typically a compound statement, which is the body of the loop edit Explanation If statement is a single statement (not a compound statement), the scope of variables declared in it is limited to the while loop as if it was a compound statement, in other words. The while statement is the simplest of the four loops that C provides, and it has a definition very similar to that of an if statement: A while statement is declared using the while keyword. When a while statement is executed, the expression is evaluated. If the expression evaluates to true (non-zero), the statement executes. Most statements in a typical C program are expression statements, such as assignments or function calls. An expression statement without an expression is called a null statement. It is often used to provide an empty body to a for or while loop.

Language
Standard Library Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library(C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Iterators library
Ranges library(C++20)
Algorithms library
Numerics library
Input/output library
Localizations library
Regular expressions library(C++11)
Atomic operations library(C++11)
Thread support library(C++11)
Filesystem library(C++17)
Technical Specifications
Statements
Labels
label : statement
Expression statements
expression ;
Compound statements
{ statement.. }
Selection statements
if
switch
Iteration statements
while
do-while
for
range for(C++11)
Jump statements
break
continue
return
goto
Declaration statements
declaration ;
Try blocks
try compound-statementhandler-sequence
Transactional memory
synchronized, atomic_commit, etc(TM TS)

Statements are fragments of the C++ program that are executed in sequence. The body of any function is a sequence of statements. For example:

C++ includes the following types of statements:

1) expression statements;
3) selection statements;
5) jump statements;
7) try blocks;

Contents

[edit]Labels

Any statement can be labeled, by providing a label followed by a colon before the statement itself.

attr(optional)identifier:statement (1)
attr(optional)caseconstexpr:statement (2)
attr(optional)default:statement (3)
While
2) case label in a switch statement;

An attribute sequence attr may appear just before the label (in which case it applies to the label), or just before any statement itself, in which case it applies to the entire statement. A statement may carry multiple labels. Labels (and only labels) have function scope. Labels are ignored by unqualified lookup: a label can have the same name as any other entity in the program.

[edit]Expression statements

An expression followed by a semicolon is a statement.

attr(optional)expression(optional); (1)
attr(C++11) - optional sequence of any number of attributes
expression - an expression

Most statements in a typical C++ program are expression statements, such as assignments or function calls.

An expression statement without an expression is called a null statement. It is often used to provide an empty body to a for or while loop. It can also be used to carry a label in the end of a compound statement.

[edit]Compound statements

Compound statements or blocks are brace-enclosed sequences of statements.

attr(optional){statement..(optional)} (1)

When one statement is expected, but multiple statements need to be executed in sequence (for example, in an if statement or a loop), a compound statement may be used:

Each compound statement introduces its own block scope; variables declared inside a block are destroyed at the closing brace in reverse order:

[edit]Selection statements

Www.antares auto tune. Selection statements choose between one of several flows of control.

attr(optional)if(condition)statement (1)
attr(optional)if(condition)statementelsestatement (2)
attr(optional)switch(condition)statement (3)
(until C++17)
attr(optional)ifconstexpr(optional)(init-statement(optional)condition)statement (1)
attr(optional)ifconstexpr(optional)(init-statement(optional)condition)statementelsestatement (2)
attr(optional)switch(init-statement(optional)condition)statement (3)
(since C++17)
1)if statement;
3)switch statement.

[edit]Iteration statements

Iteration statements repeatedly execute some code.

attr(optional)while(condition)statement (1)
attr(optional)dostatementwhile(expression); (2)
attr(optional)for(init-statementcondition(optional);expression(optional))statement (3)
attr(optional)for(for-range-decl:for-range-init)statement (4)(since C++11)
2)do-while loop;
4)range for loop.

[edit]Jump statements

Jump statements unconditionally transfer flow control

attr(optional)break; (1)
attr(optional)continue; (2)
attr(optional)returnexpression(optional); (3)
attr(optional)returnbraced-init-list; (4)(since C++11)
attr(optional)gotoidentifier; (5)
2)continue statement;
Example

While Statement Dev C Download

4)return statement using list initialization;

Note: for all jump statements, transfer out of a loop, out of a block, or back past an initialized variable with automatic storage duration involves the destruction of objects with automatic storage duration that are in scope at the point transferred from but not at the point transferred to. If multiple objects were initialized, the order of destruction is the opposite of the order of initialization.

[edit]Declaration statements

Declaration statements introduce one or more identifiers into a block.

block-declaration (1)
1) see Declarations and Initialization for details.

[edit]Try blocks

Try blocks provide the ability to catch exceptions thrown when executing other statements.

attr(optional)trycompound-statementhandler-sequence (1)

Atomic and synchronized blocks

Atomic and synchronized blocks are used to implement transactional memory.

synchronizedcompound-statement (1)(TM TS)
atomic_noexceptcompound-statement (2)(TM TS)
atomic_cancelcompound-statement (3)(TM TS)
atomic_commitcompound-statement (4)(TM TS)
1)synchronized block, executed in single total order with all synchronized blocks;
3)atomic block that rolls back on exceptions;
(TM TS)

[edit]See also

While Statement Dev C 2017

C documentation for Statements

Dev C++ 5.11

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