while loop – cppreference.com

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Führt eine Schleife .

Original:

Executes a loop.

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Dort eingesetzt, wo Code muss mehrmals ausgeführt werden, während eine Bedingung vorhanden ist .

Original:

Used where code needs to be executed several times while some condition is present.

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Syntax


`while (` cond_expression `)` loop_statement

Erklärung

cond_expression sind ein Ausdruck, dessen Ergebnis ist konvertierbar bool sein. Es wird vor jeder Ausführung loop_statement, die nur ausgeführt wird, wenn die cond_expression ausgewertet true ausgewertet .

Original:

cond_expression shall be an expression, whose result is convertible to bool. It is evaluated before each execution of loop_statement, which is only executed if the cond_expression evaluates to true.

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Keywords

while

Beispiel

#include <iostream>

int main()
{
    int i = 0;
    while (i < 10) i++;
    
    std::cout << i << '\n';
    
    int j = 2;
    while (j < 9) {
        std::cout << j << " ";
        j += 2;
    }
}

Output: