Selection structures in programming languages allow altering the default sequential execution of statements. The if-else statement conditionally executes one of two blocks of code depending on a condition. The ?: operator assigns a variable the value of one expression if the condition is true, or another expression if false. The switch statement allows executing different code blocks based on an integer expression's value. Loops like for and while repeatedly execute a block of code as long as a condition remains true, with for providing initialization and update statements.

1. 1 1 4 Enunciados de control Apoyo SSD3

2. Control and Selection By default, statements in a program are executed sequentially in the order that they appear. Programming languages provide control structures to alter this default. Selection is used to conditionally prevent the execution of a statement.

3. If-Else The general selection structure in Java is the if-else-statement. It has the following form. if (condition) { statements1 } else { statements2 }

4. Operator ?: There is an operator that is often confused with the if-else-statement, the conditional operator ("?:"). Below is an indication of its use. variable = condition ? exp1 : exp2;

5. Operator ?: If condition is true, variable is assigned the value of exp1 ; otherwise variable is assigned the value of exp2

6. Switch There is one other selection construct available in Java, the switch-statement. It has the following form. switch (expresión entera) { case cie1: statements1 case cie2: statements2 ... case cien: statementsn default: statementsd }

7. For The for-loop has the following form. for (initialization; condition; update) { statement } The statement, of course, can be a compound statement. Notice that the semicolons are separators, not terminators.

8. When a for-loop is encountered, the initialization occurs just once and foremost. Then, the condition is evaluated. If the condition evaluates to true, the body is executed, followed by the update.

9. Then, the condition is retested, and the cycle continues. When the condition becomes false, the loop is exited. If the condition never becomes false, an infinite-loop occurs. This is generally undesirable

10. While The while-loop has the following form. initialization while (condition){ body update } Since the update typically appears in the body of the while loop, the while loop often uses a compound statement.

11. Do-While The do-while loop has the following form. initialization do { body update } while (condition); The do-while loop is similar in structure to a while-loop, except in its upside-down appearance, as the condition appears after the body.