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This page gives a list of Programming problems. These are useful for anyone who wants to learn programming quickly. Each problem has a problem statement and the required output along with multiple solutions (including flawed and ill-performing solutions).

  • Hello world - Write a program to display “Hello world”


  • Addition of 2 numbers - Write a program to add two numbers


  • Greatest of 3 numbers - Find the greatest of three numbers


  • Greatest of N numbers - Find the greatest of N numbers where N is any arbitrary natural number


  • Factorial or Product of N numbers - Given N as input find N! Example: N = 4; output is 24 because 1 x 2 x 3 x 4 = 24


  • Average of N numbers - Find the average of N numbers


  • Generate prime numbers - Write a program to generate N prime numbers


  • Prime or not - Determine whether given number N is prime or not


  • Generate Fibonacci series - Write a program to generate the Fibonacci series which goes like this 1, 1, 2, 3, 5, 8, 13, 21..


  • Factorization - Break down a number into its prime factors


  • Lowest common divisor - Write a program to determine the lowest common divisor for two numbers


  • Lowest common divisor for N numbers - Write a program to determine the lowest common divisor for N numbers


  • Highest common factor - Find the highest common factor for the two given numbers


  • Highest common factor for N numbers - Find the highest common factor for the N given numbers


  • Quadratic roots - Find the roots of a quadratic equation Ax2 + Bx + C = 0 given the coefficients A, B, C


  • Area and volume - Write a program to determine the areas and/or volumes of the following geometric entities

    • i) Circle

ii) Square
iii) Rectangle
iv) Cuboid
v) Sphere
vi) Cone
vii) Cylinder

  • Number Series generation -

    • Arithmetic

• 1, 2, 3, 4, ...
• 1, 3, 5, 7, 9, ...
• 2, 4, 6, 8, …
• 10, 15, 20, 25 …

Geometric
• 2, 4, 8, 16 …
• 10, 100, 1000, 10000, …
• 3, 27, 243, …

  • Evaluate cos(x) , sin(x) - Write a program to determine the sine and cosine value of given input x.


  • Guess the number -

    • Ask the user to guess a number between 1 and 100. Try to guess it using the following logic.

Say user has chosen number 80
Prog: Is number 50?
User: G (My number is greater than that)
Prog: Is number 75?
User: G
Prog: Is number 87?
User: L (My number is lesser than that)
Prog: Is number 81?
User: L (My number is lesser than that)
Prog: Is number 78?
User: G
Prog: Is number 79?
User: G
Prog: Is number 80?
User: Y

  • Digits of a Number - Write a program to display the digits of a number.

    • Example:

Input N is 4219 (say)
Output should be 4, 2, 1, 9

  • Number from digits - Write a program to generate the number given the digits

    • Example:

The given digits are 4, 2, 1, 9
Output should be 4219

  • Reverse a number - Write a program to reverse a number

    • Example:

Output should be 9124 given 4219

  • Super-prime - Write a program to find whether N is a super-prime or not

    • Input: 7331 (is super prime)

Input: 4550 (is not super prime)
Hint: 7331 is super-prime because, 7331, 733, 73 and 7 are primes

  • Armstrong number - Write a program to determine whether a number is Armstrong number or not

    • Hint: A number is Armstrong if the sum of cubes of its digits is equal to the number itself

Input: 371 (is Armstrong)
Input: 456 (is not Armstrong)

  • Generate list of random numbers - Write a program to use an inbuilt library function to generate a list of random numbers. Also try as an added exercise to write a pseudo-random number generator


  • Print ASCII table - Write a program to print the ASCII code and the corresponding character in the form of a table


  • Matrix addition


  • Matrix Multiplication


  • Palindrome


  • Printing practice (Stars and numbers)


  • String manipulation (String concatenation, sub string, remove spaces)


  • Search and replace in strings


  • Time and date display


  • Date difference


  • Eight queens solution checking


  • Eight queens recursive solution


  • Eight queens non-recursive solution


  • Permutations


  • Combinations


  • Anagram checking


  • Anagram generation


  • Number system conversion


  • Travelling salesman problem


  • Bin-Packing problem


  • Sort N numbers


  • Sort strings in array


  • Linear search


  • Binary search


  • Hashing


  • Indexing


  • Binary trees


  • B+ trees


  • Linked list


  • Adaptive multiple choice quiz


  • Telephone directory


  • Expression solving


  • Caesar encryption


  • XOR encryption


  • Random name generation


  • Vopy and move files


  • List all directories using recursion and without


  • Spawn a shell process


  • Run two threads


  • Calculator


  • Stack


  • Queues


  • Curve fitting


  • Line fitting


  • Solution of Linear equations


  • Minimax search


  • Preprocessor for C


  • Expression evaluation


  • Sorting in Files


  • Leap year


  • Calendar generation


  • Arithmetic encoding


  • LZW text compression


  • RSA encryption


  • DES encryption


  • Polyalphabetic and Monoalphabetic encryption