C Program Practice

Problem 1 : Reverse a String

Problem Statement: 1. Write a program to reverse a string entered by the user.
Example Input: "hello"
Example Output: "olleh"

Problem 2 : Palindrome Number Check

Problem Statement: Check if a given number is a palindrome.
Example Input: 121
Example Output: Palindrome

Problem 3 : Find GCD of Two Numbers

Problem Statement: Write a program to find the greatest common divisor (GCD) of two numbers.
Example Input: 36, 60
Example Output: 12

Problem 4 : Sum of Digits in a Number

Problem Statement: Write a program to calculate the sum of digits in a number.
Example Input: 1234
Example Output: 10

Problem 5 : Fibonacci Series

Problem Statement: Print the first n terms of the Fibonacci series.
Example Input: 5
Example Output: 0 1 1 2 3

Problem 6: Count Vowels in a String

Problem Statement: Write a program to count the number of vowels in a string.
Example Input: "education"
Example Output: 5

Problem 7: Find the Second Largest Element in an Array

Problem Statement: Write a program to find the second largest element in an array.
Example Input: {12, 35, 1, 10, 34, 1}
Example Output: 34

Problem 8: Employee Salary Slip Generator

Problem Statement: Write a program to calculate the gross salary of an employee. The gross salary is calculated as:

• Gross Salary = Basic + HRA + DA
  Where:

  • HRA is 20% of Basic Salary

  • DA is 80% of Basic Salary

Example Input:
Basic Salary: 25000
Example Output:
HRA: 5000, DA: 20000, Gross Salary: 50000

Problem 9 : Electricity Bill Calculator

Problem Statement: Write a program to calculate the electricity bill based on the following tariff:

• First 100 units: ₹1.5/unit

• Next 200 units: ₹2/unit

• Above 300 units: ₹3/unit

Example Input:
Units Consumed: 350
Example Output:
Bill Amount: ₹650

Problem 10: Student Grade Calculator

Problem Statement: Write a program to calculate the grade of a student based on their marks:

• Marks >= 90: Grade A

• Marks >= 80 and <90: Grade B

• Marks >= 70 and <80: Grade C

• Marks >= 60 and <70: Grade D

• Marks < 60: Grade F

Example Input:
Marks: 85
Example Output:
Grade: B

Problem 11: Currency Denomination Calculator

Problem Statement: Write a program to calculate the minimum number of notes required for a given amount. Consider the denominations: ₹2000, ₹500, ₹200, ₹100, ₹50, ₹20, ₹10, ₹5, ₹1.

Example Input:
Amount: 2673
Example Output:
₹2000: 1, ₹500: 1, ₹100: 1, ₹50: 1, ₹20: 1, ₹1: 3

Problem 12: Banking System - Simple Interest Calculator

Problem Statement: Write a program to calculate the simple interest for a loan. The formula is:
Simple Interest (SI) = (Principal Rate Time) / 100

Example Input:
Principal: 10000
Rate: 5
Time: 2
Example Output:
Simple Interest: ₹1000

Problem 13: Voting Eligibility Checker

Problem Statement: Write a program to check if a person is eligible to vote.
Eligibility Criteria: Age must be 18 or above.

Example Input:
Age: 16
Example Output:
Not Eligible to Vote

Problem 14: Factorial of a Number

Problem Statement: Write a program to calculate the factorial of a number.
Example Input:
Number: 5
Example Output:
Factorial: 120