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What optional statement can be used in a case structure to execute statements when all other conditions are false?
Wiki User
∙ 13y ago
default : <statement>;
i.e.
switch (value) {
case 1 : do_this(); break;
case 2 : do_that(); break;
default : do_whatever();
}
Wiki User
∙ 13y ago
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Structure of If-Then statement?
if (condition) statement1 [else statement2] example: if (i==j); else if (j==k) printf ("i!=j, j==k\n); else printf ("i!=j, j!=k\n); here statement1 is an empty-statement, statement2 is another if-statement There are three forms of statements IF-THEN IF-THEN-ELSE IF-THEN-ELSIF Sequence of statements is executed only if the condition evaluates to TRUE If condition evaluates to FALSE or NULL, it does nothing In either case control passes to next statement after the IF-THEN structure IF THEN statements; END IF; Sequence of statements in the ELSE clause is executed only if the condition evaluates to FALSE or NULL IF THEN statements; ELSE statements; END IF;
What is the difference between ternary operators and if-else statement?
ternary is a single statement operator while even the most primary form of if else contains an if and an else statement. ternary only returns a value but if else can be used to do a lot of other things like printing, assigning values or just returning true or false.
What are the key points you need to remember about switch case statements?
Switch case statement:The switch case statement is a better way of handling multiple choices, it is similar to 'if-else statement' and is a better way of controlling branching behavior in a program.Switch statement tests whether an expression matches one of the case.Each case is labeled by one or more integer constant expressions. If a case matches the expression value, execution starts at that case.Default case is also present which is optional and it is executed only if none of the other cases are satisfied.Each case is terminated by break statement which causes immediate exit from the switch statementIf you miss the break statement in one of the Switch conditions, all the subsequent conditions may also get executed
What is the optional in a variable declaration statement?
Optional is the assignment of the value of course.int number; //Variable Declarationint number=2; //Assignment Declaration
Explain Selection control statements and Iteration statements in C plus plus?
Selection control statements in C++There are basically two types of control statements in c++ which allows the programmer to modify the regular sequential execution of statements.They are selection and iteration statements. The selection statements allow to choose a set of statements for execution depending on a condition. If statement and switch statement are two statements which allow selection in c++. There is also an operator known as conditional operator which enables selection.If statementSyntax : if (expression or condition){ statement 1;statement 2;}else{ statement 3;statement 4;}The expression or condition is any expression built using relational operators which either yields true or false condition. If no relational operators are used for comparison, then the expression will be evaluated and zero is taken as false and non zero value is taken as true. If the condition is true, statement1 and statement2 is executed otherwise statement 3 and statement 4 is executed. Else part in the if statement is optional. If there is no else part, then the next statement after the if statement is exceuted, if the condition is false. If there is only one statement to be executed in the if part or in the else part, braces can be omitted.Following example program implements the ifstatement.// evenodd.cpp# include # include void main(){int num;cout
Structure of If-Then statement?
if (condition) statement1 [else statement2] example: if (i==j); else if (j==k) printf ("i!=j, j==k\n); else printf ("i!=j, j!=k\n); here statement1 is an empty-statement, statement2 is another if-statement There are three forms of statements IF-THEN IF-THEN-ELSE IF-THEN-ELSIF Sequence of statements is executed only if the condition evaluates to TRUE If condition evaluates to FALSE or NULL, it does nothing In either case control passes to next statement after the IF-THEN structure IF THEN statements; END IF; Sequence of statements in the ELSE clause is executed only if the condition evaluates to FALSE or NULL IF THEN statements; ELSE statements; END IF;
How do you group compound statement in c plus plus?
A compound statement is any statement that contains zero or more statements. If there is more than one statement in a compound statement, they must be enclosed in braces {}, otherwise braces are optional with the exception of function bodies (which must always be enclosed in braces, regardless of the number of statements they contain).For example, the if statement has the following syntax:if( expression ) statement1 [elsestatement2]Either statement may be a compound statement containing zero or more statements (including other if statements). For instance, suppose x is a random signed integer:if( x
How to write an if then statement?
It depends on the language however most use the following syntax: if (expression) then statement else statement endif Note that the "then" and "endif" keywords are not used in all languages since they are implied by the statement's structure and are normally only found in verbose languages such as BASIC. In C and C++, for instance, we have the following form: if (expression) { statement; } else { statement; } The expression must be a boolean expression; one that evaluates true or false. If the expression evaluates to a number, the expression evaluates true when the number is non-zero, otherwise it is false. When the expression is true, the first statement is executed otherwise the second statement is executed. Often we do not wish to execute anything when an expression is false, only when it is true, so the else clause is optional. if (expression) statement; In languages that use braces {} to denote structure, they are usually optional for simple statements but mandatory for compound statements. A compound statement is a group of statements that are treated as being one statement. Either statement may itself be an if statement (a nested if): if (expression) { if (expression) { statement; } else { statement; } } else { statement; } Spreading if statements over multiple lines and using whitespace indentation helps to highlight the logic and structure of the statement. It is not possible to show whitespace indentation here, but here's the same example using periods instead of whitespace: if (expression) { ...if (expression) { ......statement; ...} else { ......statement; ...} } else { ...statement; } Note the use of blank lines to separate the inner (nested) if from the outer if.
What is the difference between ternary operators and if-else statement?
ternary is a single statement operator while even the most primary form of if else contains an if and an else statement. ternary only returns a value but if else can be used to do a lot of other things like printing, assigning values or just returning true or false.
What the syntax of for loop in c?
for (<exp1>; <exp2>; <exp3>) <statement> exp1 and exp3 are optional; statement can be null-statement or block-statement. Correction: All expressions are optional. An infinite loop has no expressions: for(;;);
What are the key points you need to remember about switch case statements?
Switch case statement:The switch case statement is a better way of handling multiple choices, it is similar to 'if-else statement' and is a better way of controlling branching behavior in a program.Switch statement tests whether an expression matches one of the case.Each case is labeled by one or more integer constant expressions. If a case matches the expression value, execution starts at that case.Default case is also present which is optional and it is executed only if none of the other cases are satisfied.Each case is terminated by break statement which causes immediate exit from the switch statementIf you miss the break statement in one of the Switch conditions, all the subsequent conditions may also get executed
What is the optional in a variable declaration statement?
Optional is the assignment of the value of course.int number; //Variable Declarationint number=2; //Assignment Declaration
Why break statement is optional in c plus plus?
You use a break statement to end execution of the enclosing iterator (loop) or switch statement. If omitted at the end of a case label, execution continues to the next case label, including the default case, until a jump statement is encountered (break, goto or return) or the switch statement falls from scope. Sometimes this can be desirable behaviour, thus the use of break is optional. A break statement is always optional at the end of the default case, or the last case label. Its usage in loops is always optional, to allow a loop to end prematurely regardless of the conditional expression that controls the loop.
Explain Selection control statements and Iteration statements in C plus plus?
Selection control statements in C++There are basically two types of control statements in c++ which allows the programmer to modify the regular sequential execution of statements.They are selection and iteration statements. The selection statements allow to choose a set of statements for execution depending on a condition. If statement and switch statement are two statements which allow selection in c++. There is also an operator known as conditional operator which enables selection.If statementSyntax : if (expression or condition){ statement 1;statement 2;}else{ statement 3;statement 4;}The expression or condition is any expression built using relational operators which either yields true or false condition. If no relational operators are used for comparison, then the expression will be evaluated and zero is taken as false and non zero value is taken as true. If the condition is true, statement1 and statement2 is executed otherwise statement 3 and statement 4 is executed. Else part in the if statement is optional. If there is no else part, then the next statement after the if statement is exceuted, if the condition is false. If there is only one statement to be executed in the if part or in the else part, braces can be omitted.Following example program implements the ifstatement.// evenodd.cpp# include # include void main(){int num;cout
What is a statement in C plus plus?
A statement may be simple or compound. The following examples are all simple statements: int i=1; i++; std::cout<<i<<std::endl; Note that a simple statement ends with a semi-colon. A compound statement is a group of simple statements enclosed in braces. Compound statements usually begin with an opening statement, such as for, if, switch, etc. for(int i=0; i<10; ++i) { int j=i*i; std::cout<<j<<std::endl; } In this example, the compound statement begins with the for keyword and ends at the closing brace. Everything between the braces is treated as a single statement composed from simple statements. If there were only one simple statement, the braces would be optional, but the statement would still be regarded as a compound statement. The comma operator can also be used to form compound statements (braces are neither required nor implied): int i=1, j=2; The compiler treats this as if it were written in full: int i=1; int j=2;
What is the if-else statement in c plus plus programming language?
The if-then-else inline command is shown below: returnvalue = (condition) ? (truePart) : (falsePart); ----------- According to the C standard, this command does exist in the C coding language in the same way as it exists in C++ and comparable languages. http://users.ece.cmu.edu/~eno/coding/CCodingStandard.html
How If and else run at a time?
The standard syntax is:if( conditional_expression )statement;[[else if( conditional_expression )statement;[else if...]]else statement;][] denotes optional components. Each statement may be a single statement, or may be multiple statements surrounded by braces {}.The if( conditional expression ) statement; is the only required component. In plain English, this reads: if the conditional expression is true, then execute the following statement, otherwise skip to the line following the statement.If the next line is an else statement, then the line reads: if the conditional expression is true, then execute the statement and skip over the else statement. But if the conditional expression is false, then skip over the statement and execute the else statement instead.if( conditional_expression )statement; // execute when conditional expression is trueelsestatement; // execute when conditional expression is falseThe statement following the else can be another ifstatement (a nested if):if( conditional_expression_1 )statement; // execute when conditional_expression_1 is true.else if( conditional_expression_2)statement; // execute when conditional_expression_1 is false and _2 is true.elsestatement; // execute when both _1 and _2 are both false.Note that if an else statement is used without a following if statement, it must appear after all other else if statements.
