for loop – cppreference.com

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Führt eine Schleife .

Original:

Executes a loop.

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Syntax


`for (` init_expression `;` cond_expression `;` iteration_expression `)` loop_statement

Erklärung

Die obige Syntax erzeugt Code äquivalent zu:

Original:

The above syntax produces code equivalent to:

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{

init_expression ;

while ( cond_exression ) {

loop_statement

iteration_expression ;

}

Die init_expression wird vor der Ausführung der Schleife ausgeführt. Die cond_expression wird auf den Wert zu beurteilen, umwandelbar in bool. Es wird vor jeder Iteration der Schleife ausgewertet. Die Schleife wird nur, wenn ihr Wert true ist. Die loop_statement auf jeder Iteration ausgeführt, wonach iteration_expression ausgeführt wird .

Original:

The init_expression is executed before the execution of the loop. The cond_expression shall evaluate to value, convertible to bool. It is evaluated before each iteration of the loop. The loop continues only if its value is true. The loop_statement is executed on each iteration, after which iteration_expression is executed.

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Keywords

for

Beispiel

#include <iostream>

int main() 
{
    for (int i = 0; i < 10; i++) {
        std::cout << i << " ";
    }

    std::cout << '\n';
    
    for (int j = 2; j < 9; j = j + 2) {
        std::cout << j << " ";
    }
}

Output:

0 1 2 3 4 5 6 7 8 9
2 4 6 8