Practice Questions: if-elseif-else

1. Largest of Three Numbers: Input three numbers and print the largest one.
2. Character Check: Input a character and check whether it is a vowel, consonant, digit, or special character.
3. Grade Calculator: Input marks and assign grades:

90ô100 åÆ A 
80ô89 åÆ B 
70ô79 åÆ C 
60ô69 åÆ D 
<60  åÆ F

4. Triangle Validity: Input three angles of a triangle and check if the triangle is valid (sum = 180░).

5. Profit or Loss: Input cost price (CP) and selling price (SP), and print whether there is a profit, loss, or no profit/loss.

6. Absolute Value: Input any number and print its absolute value (without using built-in functions).