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# What is an expression evaluates as either true or false?

Updated: 4/28/2022 Wiki User

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Q: What is an expression evaluates as either true or false?
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### You use the operator to reverse the meaning of a Boolean expression?

The NOT operator. E.g., NOT TRUE evaluates to FALSE while NOT FALSE evaluates to TRUE.

### What expression has a value of either true or false?

In C, any non-zero expression is true and any zero expression is false.

### Is this true 5-3-5-(3-1)?

No, the expression 5-3-5-(3-1) evaluates to 3, not zero.

### Can you Compare while and do-while?

The 'while' statement evaluates its expression at the beginning of the loop, while a 'do while' statement evaluates its expression at the end of the loop. The 'while' statement might execute no times. The 'do while' statement will execute at least one time. It depends on what you want to do, and on how you want to use the side effects, if any, of the expressions in the expression. (Before or after)

### What is it called when there is an equation that is always true?

an identity? maybe a tautology? Comment by mgately: In the field of discrete mathematics (simplified the study of logic) any expression which always evaluates to true is in fact called a tautology. While less cool sounding, an expression which always evaluates to false is just called a contradiction.

### Define an expression that evaluates to true when i equals j?

In Java, or C, the expression is simply:i == jIf the two are equal, this expression will evaluate to true; if not, it will evaluate to false.In Java, or C, the expression is simply:i == jIf the two are equal, this expression will evaluate to true; if not, it will evaluate to false.In Java, or C, the expression is simply:i == jIf the two are equal, this expression will evaluate to true; if not, it will evaluate to false.In Java, or C, the expression is simply:i == jIf the two are equal, this expression will evaluate to true; if not, it will evaluate to false.

### What is if in C?

If is a keyword that introduces a conditional expression. If the expression evaluates true, the statement or statement block that follows is executed, otherwise control is passed to the line following the statement or statement block, which may be another conditional expression. if( expression_1 ) { // do something when expression_1 is true } else if( expression_2) { // do something when expression_1 is false but expression_2 is true } else { // do something when both expression_1 and expression_2 are false }

### What is the format of if statement in c plus plus?

Syntax:if (expression)statement;[elsestatement;]The expression must evaluate to a boolean value, where zero is false and all non-zero values are true. The statement (including the optional else statement) may be simple or compound, and may include a nested if statement. When the expression evaluates true, the first statement is invoked. If an else statement is provided, it is only executed when the expression evaluates false. After the appropriate statement is invoked, execution passes to the statement that immediately follows the entire if statement.

### Is the statement -14-10 true?

Yes, any expression that evaluates non-zero is implicitly true.

### What is flag controlled while loop?

A while loop evaluates a conditional expression at the start of each iteration. If the conditional expression evaluates false, execution passes to the statement that immediately follows the body of the loop. If the conditional expression evaluates true, the body of the loop executes one iteration. When the end of the loop is reached, or a continue statement is encountered within the body of the loop, control passes back to the while statement where the conditional expression is re-evaluated. If a break statement is encountered within the body of the loop, the loop terminates and control passes to the next statement. If a return statement is encountered within the body of the loop, the loop terminates and control passes to the calling function.while (expression) {// repeats until the expression evaluates false}The braces are optional when the body of the loop is a simple statement. Compound statements must be enclosed in braces.A flag-controlled while loop has a simple conditional expression that evaluates a Boolean value:bool x;// ...while (x==true) { // flag-controlled loop// ...}}The above loop can also be written without the equality operator:while (x) { // flag-controlled loop // ...}Moreover, any integral type (such as int or char) will implicitly convert to a bool such that non-zero values evaluate true and zero evaluates false. As such, any integral type can be used in a flag-controlled loop.

### In evaluating a logical expression of type Boolean expression1 Boolean expression2 Both the Boolean expressions are not always evaluated True False?

FALSE.... cuz in &amp;&amp; operator the compiler chk both of the expression if any of the expression is false then answer will be false.. for true result both of d expression must be true... by warrior2pnk

### How do I use the IF function?

The IF function takes three parameters. The first is an expression, such as an inequality, that will evaluate to either true or false. If the expression is true the second parameter is used, otherwise the third parameter is used.