Topic: language-problem / Level: beginner

• 151. Write a program to find the first duplicate character in a string.
• 152. Write a program to implement a simple banking system.
• 153. Write a program to calculate the sum of all even numbers in an array.
• 154. Write a program to find the product of digits of a number.
• 155. Write a program to implement a basic contact management system.
• 156. Write a program to calculate the factorial of a number using loops.
• 157. Write a program to check if a string is a valid URL (basic validation).
• 158. Write a program to find the count of occurrences of each character in a string.
• 159. Write a program to calculate the distance between two points in a 2D plane.
• 160. Write a program to convert seconds to hours, minutes, and seconds.
• 161. Write a program to implement a simple string tokenizer.
• 162. Write a program to find the length of the shortest word in a sentence.
• 163. Write a program to check if two numbers are amicable numbers.
• 164. Write a program to find the sum of the first n odd numbers.
• 165. Write a program to print a checkerboard pattern using stars.
• 166. Write a program to calculate the circumference of a circle given its radius.
• 167. Write a program to implement a basic grade calculator.
• 168. Write a program to find the maximum and minimum in a list of n numbers.
• 169. Write a program to check if a string is a valid number (integer or decimal).
• 170. Write a program to implement a basic personal diary system.
• 171. Write a program to calculate the area of a trapezoid given the lengths of the bases and the height.
• 172. Write a program to check if a year is a leap year using functions.
• 173. Write a program to find the common elements between three arrays.
• 174. Write a program to implement a basic shopping cart system.
• 175. Write a program to count the number of sentences in a paragraph.
• 176. Write a program to find the smallest prime number greater than a given number.
• 177. Write a program to convert a number from binary to decimal.
• 178. Write a program to implement a basic text file writer.
• 179. Write a program to check if a given password is strong.
• 180. Write a program to find the index of the last occurrence of a character in a string.
• 181. Write a program to implement a simple note-taking application.
• 182. Write a program to calculate the sum of all multiples of 3 and 5 below a given number.
• 183. Write a program to find the longest palindrome substring in a string.
• 184. Write a program to check if a number is a square number.
• 185. Write a program to implement a basic to-do list with add and remove functionality.
• 186. Write a program to find the median of a list of numbers.
• 187. Write a program to check if a character is uppercase or lowercase.
• 188. Write a program to convert a string to lowercase.
• 189. Write a program to implement a basic fitness tracker.
• 190. Write a program to check if a number is part of the Fibonacci series.
• 191. Write a program to implement a simple recipe management system.
• 192. Write a program to calculate the sum of all natural numbers up to n.
• 193. Write a program to check if a string starts with a vowel.
• 194. Write a program to find the LCM of three numbers.
• 195. Write a program to convert a decimal number to hexadecimal.
• 196. Write a program to implement a simple quiz application.
• 197. Write a program to count the number of digits in a given number.
• 198. Write a program to find the sum of digits at odd positions in a number.
• 199. Write a program to check if a number is a negative number.
• 200. Write a program to implement a basic movie database system.

• More Levels

• Intermediate
• Advanced