Extension GetEnumerator support for foreach loops (C# 9.The following example shows the usage of the while statement: int n = 0 įor more information, see the following sections of the C# language specification:įor more information about features added in C# 8.0 and later, see the following feature proposal notes: The while loop differs from the do loop, which executes one or more times. Because that expression is evaluated before each execution of the loop, a while loop executes zero or more times. Inside the loop, we have a simple expression console.log(i). In other words, this increments the value of i by one in each iteration. The while statement executes a statement or a block of statements while a specified Boolean expression evaluates to true. As the loop progresses, this is checked each time before jumping into the loop statements. The following example shows the usage of the do statement: int n = 0 The do loop differs from the while loop, which executes zero or more times. Recall from the section on using variables that a shorthand for adding 1 (or. Because that expression is evaluated after each execution of the loop, a do loop executes one or more times. Then, we want to add 1 to the value of n ready for the next repetition. The do statement executes a statement or a block of statements while a specified Boolean expression evaluates to true. If that's not the case, an InvalidCastException is thrown. At run time, the type of a collection element may be the one that derives from T and actually implements V. For example, if T is a non-sealed class type, V can be any interface type, even the one that T doesn't implement. If an explicit conversion from T to V fails at run time, the foreach statement throws an InvalidCastException. In the preceding form, type T of a collection element must be implicitly or explicitly convertible to type V of an iteration variable. You can also explicitly specify the type of an iteration variable, as the following code shows: IEnumerable collection = new T The following example shows the for statement that executes its body while an integer counter is less than three: for (int i = 0 i interface, as the following example shows: var fibNumbers = new List The for statement executes a statement or a block of statements while a specified Boolean expression evaluates to true. While Loop The while loop is Java's most fundamental loop statement. For a detailed example, have a look at the dedicated post: Java For Loop. You can step to the next iteration in the loop using the continue statement. A for loop is a control structure that allows us to repeat certain operations by incrementing and evaluating a loop counter. The while statement conditionally executes its body zero or more times.Īt any point within the body of an iteration statement, you can break out of the loop using the break statement. The do statement conditionally executes its body one or more times. The foreach statement enumerates the elements of a collection and executes its body for each element of the collection. The for statement executes its body while a specified Boolean expression evaluates to true. The iteration statements repeatedly execute a statement or a block of statements.
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