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5.True and False in C++

Many C

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action is to be taken. A conditional expression evaluates to either a true or a false

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false value is 0.This approach to true and flase allows a widerange of

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C++ fully supports the Zero/non-Zero definition oftrue and false

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bool,which can have only the values true and false. if an

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to false and a non-zero value is automatically

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converts to 1 and false converts to 1

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6.Selection Statements

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If statement

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7.if , if...else,if...else if...else in C++

Syntax:

if statement if...else statement if...else if...else statement

if(condition)

{

statements;

if(condition)

{

statements;

if(condition){

statements;

}

else if{

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}

}

else

{

statements;

}

statements;

}else

{

statements;

}

Example:1

/*Example for if and if...else statement*/

void main()

{

int a,b;

a=5;< /FONT>

b=10;< /FONT>

if ( a > b)

cout

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a=5;

b=10;

c=15;

if ( a > b && a > c)

cout

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cout

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default:

statements;

}

In the above syntax the expression must evaluvate to a charecter or integer value.

Note:Floating-Point expressions are not allowed.

The value of expression is tested in order against the values of the constants specified inthe case statements. When a match is found, the statements sequence associated with that

case is executed until the break statement or the end of the switch statement is reached.

The default statement is executed if no matches are found. The default is optional and if itis not present, no action takes place if all matches fail.

Standard C specifies that a switch can have at lease 257 case statements. StandardC++ recommends that at least 16,384 case statements be supported! In Practice, you

will want to limit the number ofcase statements to a smaller amount for efficiency.Although case is a label statement, it cannot exist by itself, outside of a switch.

The breakstatement is one of C/C++'s jump statements. You can use it in loops as well

as in the switch statement. When breakis encountered in a switch, program execution

"jumps" to the line of code following the switch statement.

There are three important things to know about the switch statement:

The switch differs from the if in that switch can only test for equality, whereas ifcan evaluate any type of relational or logical expression.

No two constants in the same switch can have identical values. Of course, a

switch statement enclosed by an outer switch may have case constants that are the

same.

If charecter constants are used in the switch statement, they are automatically

converted in to integers. switch is often used to process keyboard commands, such as menu selection.

Example:3

void menu(void)

{char ch;

cout

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cout