C if else Statement

The if else in C is an extension of the if statement which not only allows the program to execute one block of code if a condition is true, but also a different block if the condition is false.

• If the condition is true, then the code inside the if block is executed, otherwise the code inside the else block is executed.
• Any non-zero and non-null values are assumed to be true, and zero or null values are assumed to be false.

10 is greater than 5

Explanation: In the above program, the condition checks if the variable n is greater than 5. If true, if block is executed and it prints that n is greater than 5. If it evaluates to false, the else block is executed, printing that n is less than 5. Since n is 10, it prints "10 is greater than 5".

Working of if-else statement

The below flowchart explains the if else works in C:

• The if-else statement works by checking the condition defined with the if statement.
• If the condition defined in the if statement is true, then the code inside the if block is executed and the rest is skipped.
• If the condition evaluates to false, then the program executes the code in the else block

Negative Number check using If-else statement

Negative

Explanation: In this program, the if statements check if the given number n is less than 0 which means that the number is negative. As n is negative, it prints the if block. But if the number n was positive, the else block would have been executed.

Note: If long at the block only contains the single statement, we can skip the curly braces.

Check if Integer Lies in the Range

Largest Among Three Numbers Using If-else