Must practice programming questions in all languages

To master any programming languages, you need to definitely solve/practice the below-listed problems. These problems range from easy to advanced difficulty level. I have collected these questions from various websites.

For solutions refer this - https://www.faceprep.in/c-programming-questions/

Easy

• A character is a vowel or consonant
• A character is an alphabet or not
• Ascii values ​​of a character
• Uppercase, Lowercase or special character
• A number is positive or negative
• A number is even or odd
• Area of ​​a circle
• LCM of number numbers
• GCD of two numbers
• Greatest of two numbers
• Greatest of three numbers
• Number of digits in an integer
• Sum of digits of a number
• Sum of N natural numbers
• Sum of numbers in a given range
• Reverse a given number
• Factorial of a number
• Fibonacci series up to n
• Leap year or not
• Prime number or not
• Palindrome or not
• Armstrong number or not
• Strong number or not
• Perfect number or not
• Friendly pair or not (amicable or not)
• Automorphic number or not
• Harshad number or not
• Abundant number or not
• Power of a number
• Factors of a number
• Add two fractions
• Basic string operations
• Length of the string without using strlen() function
• Toggle each character in a string
• Count the number of vowels
• Remove vowels from a string
• String is a palindrome or not
• Sorting a string in alphabetical order
• Removing brackets from an algebraic expression
• Remove characters in a string except alphabets
• Remove spaces from a string
• Basic array operations (Insert, delete and search an element)
• Smallest and largest element in an array
• Sum of elements in an array
• Check if two arrays are the same or not
• Finding the array type
• Sum of positive square elements in an array
• Second smallest element in an array
• Sorting the elements of an array
• Reversing an array
• Longest palindrome in an array
• Count distinct elements of an array
• Matrix operations (Addition, subtraction and multiplication)
• Transpose of a matrix
• Upper triangular matrix or not
• Lower triangular matrix or not
• The maximum element in a row
• The maximum element in a column
• Sum of each row and column of a matrix

Medium

• Prime numbers in a given range
• Armstrong numbers between two intervals
• Can a number be expressed as a sum of two prime numbers?
• Replace all 0’s with 1 in a given integer
• Binary to decimal conversion
• Decimal to binary conversion
• Decimal to octal conversion
• Octal to decimal conversion
• Binary to octal conversion
• Octal to binary conversion
• Maximum number of handshakes
• Quadrants in which coordinates lie
• Convert digit/number to words
• Number of days in a given month of a given year
• Permutations in which n people can occupy r seats in a theatre
• Number of times digit 3 occurs in each and every number from 0 to n
• Number of integers which has exactly 9 divisors
• Roots of a quadratic equation
• Count possible decodings of a given digit sequence
• Count the sum of numbers in a string
• Capitalize the first and last letter of each word of a string
• Frequency of characters in a string
• Non-repeating characters in a string
• Check if two strings are Anagram or not
• Patterns of 0(1+)0 in the given string
• Replace substring in a string
• Count common subsequence in two strings
• Reverse a string
• Check if two strings match where one string contains wildcard characters
• Non-repeating elements of an array
• Repeating elements in an array
• Remove duplicate elements in an array
• Minimum scalar product of two vectors
• Maximum scalar product of two vectors
• Can the numbers of an array be made equal?
• Missing elements of a range
• Triplets with a given sum
• Number of even and odd elements in an array
• Frequency of each element of an array
• Symmetric pairs in an array
• Maximum product subarray in a given array
• Arrays are disjoint or not
• Array is a subset of another array or not
• Can all numbers of an array be made equal
• Minimum sum of absolute difference of given array
• Sorting elements of an array by frequency
• Sort an array according to the order defined by another array

Advanced:

• Replace each element of the array by its rank in the array
• Equilibrium index of an array
• Array rotation – Left and right
• Block swap algorithm for array rotation
• Juggling algorithm for array rotation
• Circular rotation of an array by K positions
• Convert an array into a zig-zag fashion
• Merge two sorted arrays
• Longest subarray having an average greater than or equal to k
• Rearrange positive and negative numbers in an array
• Sum of all odd frequency elements in an array
• Median of two sorted arrays
• 0-1 Knapsack problem
• Saddle point coordinates of a given matrix
• Sum of elements in the zig-zag sequence of a matrix
• Sum of boundary elements of a matrix
• Matrix printing in a spiral form
• Rotate the matrix by K times
• Matrix rotation by 90 degrees clockwise and anticlockwise
• Maximum size of square submatrix with all 1's in a binary matrix

Pattern printing programs

• Solid and hollow rectangle star pattern
• Pyramid pattern using stars
• Pyramid pattern using numbers
• Palindromic pyramid pattern printing
• Diamond pattern printing using stars
• Diamond pattern printing using numbers
• Floyd's triangle
• Pascal triangle