Well this happens to be a very core concept of computer programming, and we can do exactly as previously described with these things called 'if' statements. These are basic statements which allow us to do certain things only in certain conditions. The first thing we're going to learn about is the 'if' itself.
In C++, the braces of an if or an else clause can contain another if statement. These are known as nestedif statements. The following NestedIf program shows an example of a nested if statement in use.
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This program starts by asking for the user’s birth year. If the birth year is later than 2000, then the program outputs the string “You were born in the 21st century”.
In mathematically accurate terms, the year 2000 belongs to the 20th century, not the 21st.
If the birth year is not greater than 2000, then the program enters the else clause of the outer if statement. This clause starts by outputting the string “You were born in” before comparing the birth year to 1950.
If the birth year is less than 1950, then the program adds the first “the first half”. If the birth year is not less than 1950, then the else clause of the inner if statement is executed, which tacks on the phrase “the second half”. Finally, the program adds the concluding phrase “of the 20th century” to whatever has been output so far.
In practice, the output of the program appears as follows for three possible values for birth year. First, 2002 produces the following:
For example, 1956 generates the following:
Finally, the birth year of 1932 generates the third possibility:
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You could use a nested if to avoid the unnecessary comparisons in the NestedBranchDemo program:
This version performs the first comparison just as before. If nOperand1 is greater than nOperand2, this snippet outputs the string “Argument 1 is greater than argument 2”. From here, however, control jumps to the final closed brace, thereby skipping the remaining comparisons.
If nOperand1 is not greater than nOperand2, then the snippet performs a second test to differentiate the case that nOperand1 is less than nOperand2 from the case that they are equal in value.
The figure shows graphically the flow of control for the NestedBranchDemo program for the input of 5 and 10.
Performing the test for equality is unnecessary: If nOperand1 is neither greater than nor less than nOperand2, then it must be equal.
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An if statement can be followed by an optional else statement, which executes when the boolean expression is false.
Syntax
The syntax of an if..else statement in C++ is −
If the boolean expression evaluates to true, then the if block of code will be executed, otherwise else block of code will be executed.
Flow Diagram
Example
When the above code is compiled and executed, it produces the following result −
if..else if..else Statement
An if statement can be followed by an optional else if..else statement, which is very usefull to test various conditions using single if..else if statement.
When using if , else if , else statements there are few points to keep in mind.
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An if can have zero or one else's and it must come after any else if's.
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An if can have zero to many else if's and they must come before the else.
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Once an else if succeeds, none of he remaining else if's or else's will be tested.
Syntax
The syntax of an if..else if..else statement in C++ is −
Nested If Statement In Dev C Download
Example
C Nested If Else Statement
When the above code is compiled and executed, it produces the following result −