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Branching causes your program to depart from a top-down statement-by-statement execution.
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A method call is the most common form of unconditional branching. When the method completes, execution returns to the point where it left off.
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Conditional branching enables your program to branch based on runtime conditions, typically based on the value or relative value of one or more objects or variables .
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The if construct executes a statement if a condition is true and skips it otherwise .
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When the condition in an if statement is actually two conditions joined by an or operator, if the first condition evaluates to TRue , the second condition will not be evaluated at all. This is called short-circuiting .
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The if/else construct lets you take one set of actions if the condition tested evaluates true, and a different set of actions if the condition tested evaluates false.
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if statements can be nested to evaluate more complex conditions.
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The switch statement lets you compare the value of an expression with several constant values (either integers, enumerated constants, or strings), and take action depending on which value matches.
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It is good programming practice for switch statements to include a default statement that executes if no other matches are found.
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Iteration, or looping, allows you to take the same action several times consecutively. Iterations are typically controlled by a conditional expression.
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The goto statement is used to redirect execution to another point in the program, and its use is typically discouraged.
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The while loop executes a block of code while the tested condition evaluates true. The condition is tested before each iteration.
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The do...while loop is similar to the while loop, but the condition is evaluated at the end of the iteration, so that the iterated statement is guaranteed to be executed at least once.
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The for loop is used to execute a statement a specific number of times. The header of the for loop can be used to initialize one or more variables, test a logical condition, and modify the variables. The typical use of a for loop is to initialize a counter once, test that a condition is using that counter before each iteration, and modify the counter after each iteration.
