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Default clause in switch statement used to indicate that the desired option is not available with the switch case statement. it is similar to else statement of if statement which is used when the condition does not satisfy.
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∙ 10y ago
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∙ 11y agoIt means any other choice that has not been written.
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What is the format of the switch statement?
switch (expression) { case value 1 : [ statement-block 1] [break ;] case value 2 : [ statement-block 2] [break ;] ……. ……. case value N : [ statement-block N] [break ;] [default: [default block] [break;] ] } statement x;
Multiple default statements in switch statement in c?
I really think this is not possible.
Write an equivalence of switch statement and if statement?
switch(ch) { case '+': ....cout <<"arithmetic operator"; ....break; //<===break is a must /// <====================other cases . . default: // <=======else }
What are case label?
the case label that contains the matching value. If there is no matching value but there is a default label in the switch body, control passes to the default labelled statement. If no matching value is found, and there is no default label anywhere in the switch body, no part of the switch body is processed
What is the use of Default statement in switch case?
C++ Provides a multiple branch selection called as switch. This selection statement succesively test against a list of integer or character constants. When a match is found the statements associate with constants are executed. When no match is found default statement is used.
What is the format of the switch statement?
switch (expression) { case value 1 : [ statement-block 1] [break ;] case value 2 : [ statement-block 2] [break ;] ……. ……. case value N : [ statement-block N] [break ;] [default: [default block] [break;] ] } statement x;
Multiple default statements in switch statement in c?
I really think this is not possible.
Write an equivalence of switch statement and if statement?
switch(ch) { case '+': ....cout <<"arithmetic operator"; ....break; //<===break is a must /// <====================other cases . . default: // <=======else }
What are case label?
the case label that contains the matching value. If there is no matching value but there is a default label in the switch body, control passes to the default labelled statement. If no matching value is found, and there is no default label anywhere in the switch body, no part of the switch body is processed
What is the use of Default statement in switch case?
C++ Provides a multiple branch selection called as switch. This selection statement succesively test against a list of integer or character constants. When a match is found the statements associate with constants are executed. When no match is found default statement is used.
What is regular grammar of a switch in C programming language?
Perhaps you meant 'switch statement' instead of 'a switch'?Something like this: -> -> switch () -> { } -> (empty) | -> []; -> | -> case: | default: -> | break;
Calling a function from switch in C?
Yes, you can call a function from within a switch statement in C. switch (i) { case 0: function1(i); break; case 1: function2(i); break; default: function3(i); break; } When the function returns, you will still be in the switch statement.
What is the use of the default case in a switch case?
The default case in a switch statement will be activated if none of the other case values match. It is used exactly for this purpose - if nothing else matches in the switch then this one will always match.Without a default case value, if nothing matched in the switch then nothing will be done. Sometimes it is necessary to know that nothing matched.
What optional statement can be used in a case structure to execute statements when all other conditions are false?
default : <statement>; i.e. switch (value) { case 1 : do_this(); break; case 2 : do_that(); break; default : do_whatever(); }
What is the last value of case in switch in c?
I guess you mean 'default'
What is the syntax and purpose of the switch statement in c plus plus?
The purpose of a switch statement is to execute one of several sections of code, depending on the value of an integral expression. The syntax of a switch statement can be stated as follows: switch(expression) { case(constant_expression_1): statement case(constant_expression_2): statement //.. case(constant_expression_n): statement [default: statement] } The ellipses around the constant expressions are optional and may be omitted. The switch statement body consists of one or more case labels and an optional default label (the case labels are also optional, but a switch statement would be meaningless without them). The default statement, if present, need not be the final label in a switch statement. Case and default labels may not appear outside of a switch statement, as they are not treated the same as goto labels. The constant_expression in each case label is converted to the type of the switch expression and is compared with the switch expression for equality. Control is immediately passed to the labelled statement whose constant_expression matches the value of the switch expression. Once a label gains control, execution proceeds from that point on and is not impeded by any subsequent case or default labels. However, a break statement may be used to interrupt execution at any time, which will transfer control to the statement immediately following the switch statement body. You may also use a return statement to return control to the calling function, or a goto statement. However, note that while a goto label is not the same as a case label, you may use goto labels inside a switch statement if required. Here's an example demonstrating how code flows through a switch statement: int x; switch(x=rand()%10) // x is a random number in the range 0 to 9. { case(0): x=42; break; case(1): case(2): x=33; break; case(3): x=100; default: x=0; } If x were 0, then execution passes to case(0) where the value 42 is assigned to x and the switch exits. If x were 1 or 2, then 33 is assigned to x and the switch exits. If x were 3, 100 is assigned to x. In all other cases, 0 is assigned to x. You will note that when the switch statement ends, x can only ever be 42, 33 or 0. Why not 100? Look again and you will see that case(3) has no break statement (just as case(1) has no break statement). So although 100 is assigned to x in case(3), the default case immediately assigns 0 to x. This is not a particularly useful switch statement, but it serves to demonstrate how code flows through a switch statement, and how forgetting to put a break statement at the end of a case can cause unexpected errors to creep into your code. While you could emulate the same results using a series of if, else if and else statements, the benefit of a switch statement is that it will generally simplify the complexity of your code, because there is only one expression to evaluate, rather than a series of boolean expressions. Your compiler will generate machine code just as if you'd used a series of if statements, but the switch statement gives a greater sense of structure to the statement, and gives a greater degree of control over which section(s) of code will execute for any given evaluation. And just as ifs can be nested within other ifs, switch statements can be nested within other switch statements. Note that all code in a switch statement must be reachable (that is, not bypassed by all execution paths). For instance the following contains both unreachable and undefined code: switch(x) { x=42; //unreachable case(100): int y=42; break; default: x=y; // y is undefined } The line x=42 cannot be reached because execution must either pass to either the case(100) or the default label. Similarly, the x=y line is invalid because y is defined within the case(100) label, which is not reachable from within the default label due to the break statement.
What is default in switch is C language?
When in the switch none of the case's is true, the code at the default: is executed.
