Top 100 Codes

December 2, 2021

PrepInsta Top 100 Codes

Below You will find some of the most important codes in languages like C, C++ and Java. These codes are of prime importance for college semester exams and also for various online tests and interviews of the companies offering placements within varying range in LPA.

These codes are very important since these will help you clear your basic concepts in various languages.

Positive or Negative number: C | C++ | Java | Python
Even or Odd number: C | C++ | Java | Python
Sum of First N Natural numbers: C | C++ | Java | Python
Sum of N natural numbers: C | C++ | Java | Python
Sum of numbers in a given range: C | C++ | Java | Python
Greatest of two numbers: C | C++ | Java | Python
Greatest of the Three numbers: C | C++ | Java | Python
Leap year or not: C | C++ | Java | Python
Prime number: C | C++ | Java | Python
Prime number within a given range: C | C++ | Java | Python
Sum of digits of a number: C | C++ | Java | Python
Reverse of a number : C | C++ | Java | Python
Palindrome number: C | C++ | Java | Python
Armstrong number : C | C++ | Java | Python
Armstrong number in a given range : C | C++ | Java | Python
Fibonacci Series upto nth term : C | C++ | Java | Python
Factorial of a number : C | C++ | Java | Python
Power of a number : C | C++ | Java | Python
Factor of a number : C | C++ | Java | Python
Strong number : C | C++ | Java | Python
Perfect number : C | C++ | Java | Python
Automorphic number : C | C++ | Java | Python
Harshad number : C | C++ | Java | Python
Abundant number : C| C++ | Java | Python
Friendly pair : C | C++ | Java | Python

Highest Common Factor(HCF): C | C++ | Java | Python
Lowest Common Multiple (LCM) : C | C++ | Java | Python
Greatest Common Divisor : C | C++ | Java | Python
Binary to Decimal to conversion : C | C++ | Java | Python
Binary to Octal conversion : C | C++ | Java | Python
Decimal to Binary conversion: C | C++ | Java | Python
Decimal to octal Conversion: C | C++ | Java | Python
Octal to Binary conversion : C | C++ | Java | Python
Octal to Decimal conversion : C | C++ | Java | Python
Quadrants in which a given coordinate lies : C | C++ | Java | Python
Permutations in which n people can occupy r seats in a classroom : C | C++ | Java | Python
Maximum number of handshakes: C | C++ | Java | Python
Addition of two fractions: C | C++ | Java | Python
Replace all 0’s with 1 in a given integer : C | C++ | Java | Python
Can a number be expressed as a sum of two prime numbers : C | C++ | Java | Python
Count possible decoding of a given digit sequence : C | C++ | Java
Check whether a character is a vowel or consonant : C | C++ | Java | Python
Check whether a character is a alphabet or not : C | C++ | Java | Python
Calculate the area of a circle : C | C++ | Java | Python
Find the ASCII value of a character : C | C++ | Java | Python
Find the prime numbers between 1 to 100 : C | C++ | Java | Python
Calculate the number of digits in an integer : C | C++ | Java | Python
Convert digit/number to words : C | C++ | Java | Python
Counting number of days in a given month of a year: C | C++ | Java | Python
Finding Number of times x digit occurs in a given input : C | C++ | Java | Python
Finding number of integers which has exactly x divisors: C | C++ | Java | Python
Finding Roots of a quadratic equation : C | C++ | Java | Python

Important Codes related to Arrays

Find Smallest Element in an Array : C | C++ | Java | Python
Find Second Smallest Element in an Array : C | C++ | Java | Python
Find Largest element in an array : C | C++ | Java | Python
Find the Smallest and largest element in an array : C | C++ | Java | Python
Calculate the sum of elements in an array : C | C++ | Java | Python
Reverse an Array : C | C++ | Java | Python
Sort first half in ascending order and second half in descending : C | C++ | Java | Python
Sort the elements of an array : C | C++ | Java | Python
Finding the frequency of elements in an array : C | C++ | Java | Python
Finding the Longest Palindrome in an Array : C | C++ | Java| Python
Counting Distinct Elements in an Array : C | C++ | Java| Python
Finding Repeating elements in an Array : C | C++ | Java | Python
Finding Non Repeating elements in an Array : C | C++ | Java | Python
Removing Duplicate elements from an array : C | C++ | Java
Finding Minimum scalar product of two vectors : C | C++ | Java | Python
Finding Maximum scalar product of two vectors in an array : C | C++ | Java | Python
Counting the number of even and odd elements in an array : C | C++ | Java | Python
Find all Symmetric pairs in an array : C | C++ | Java | Python
Find maximum product sub-array in a given array : C | C++ | Java | Python
Finding Arrays are disjoint or not : C | C++ | Java | Python
Determine Array is a subset of another array or not : C | C++ | Java | Python
Determine can all numbers of an array be made equal : C | C++ | Java | Python
Finding Minimum sum of absolute difference of given array : C | C++ | Java | Python
Sorting elements of an array by frequency : C | C++ | Java | Python
Sort an array according to the order defined by another array : C | C++ | Java | Python
Replace each element of the array by its rank in the array : C | C++ | Java | Python
Finding equilibrium index of an array : C | C++ | Java| Python
Rotation of elements of array- left and right : C | C++ | Java| Python
Block swap algorithm for array rotation : C | C++ | Java| Python
Juggling algorithm for array rotation : C | C++ | Java | Python
Finding Circular rotation of an array by K positions : C | C++ | Java | Python

You can find the below Programs in all languages

Program for Pyramid star pattern
Program for Pyramid number pattern
Program for Palindromic Pyramid Pattern – Java | Python
Program for Diamond star pattern
Program for Diamond number pattern
Program for Floyd’s Trianlge – Java | Python
Program for Pascal triangle – Java | Python
Program to Check array similarity
Program for Square sum
Program for Longest palindrome in the array

Operations on Strings

Length of the string without using strlen() function : C | C++ | Java | Python
Toggle each character in a string : C | C++ | Java | Python
Count the number of vowels : C | C++ | Java | Python
Remove the vowels from a String : C | C++ | Java | Python
Check if the given string is Palindrome or not : C | C++ | Java | Python
Print the given string in reverse order : C | C++ | Java | Python
Remove all characters from string except alphabets : C | C++ | Java | Python
Remove spaces from a string : C | C++ | Java | Python
Remove brackets from an algebraic expression : C | C++ | Java | Python
Count the sum of numbers in a string : C | C++ | Java | Python
Capitalize the first and last character of each word of a string : C | C++ | Java | Python
Calculate frequency of characters in a string : C | C++ | Java | Python
Find non-repeating characters in a string : C | C++ | JAVA | Python
Check if two strings are Anagram or not : C | C++ | Java | Python
Replace a sub-string in a string: C | C++ | Java | Python
Count common sub-sequence in two strings : C | C++ | Java | Python
Check if two strings match where one string contains wildcard characters : C | C++ | Java | Python

Pattern Printing

           ****
           ****
           ****
           ****

Square Star Pattern

Difficulty – ★

Checkout code for this program –

C | Java | Python

Hollow Square Star Pattern

Difficulty – ★ and 1/2

Checkout code for this program –

C | Java | Python

           ****
            ****
             ****
              ****

Rhombus Star Pattern

Difficulty – ★★

Checkout code for this program –

C | Java | Python

           ******
           ******
           ******
           ******

Rectangle Star Pattern

Difficulty – ★

Checkout code for this program –

C | Java | Python

           ******
           *    *
           *    *
           ******

Hollow Rectangle Star Pattern

Difficulty – ★ and 1/2

Checkout code for this program –

C | Java | Python

           ******
            ******
             ******
              ******

Parallelogram Star Pattern

Difficulty – ★★

Checkout code for this program –

C | Java | Python

           ****
          ****
         ****
        ****

Mirrored Rhombus Star Pattern

Difficulty – ★★ and 1/2

Checkout code for this program –

C | Java | Python

Triangle Star Pattern

Difficulty – ★ and 1/2

C | Java | Python

              *
             ***
            *****
           *******

Pyramid Star Pattern

Difficulty – ★★

C | Java | Python

Hollow Pyramid Star Pattern

Difficulty – ★★

C | Java | Python

           *******
            *****
             ***
              *

Inverted Pyramid Star Pattern

Difficulty – ★★

C | Java | Python

Inverted Hollow Pyramid Star Pattern

Difficulty – ★★ and 1/2

C | Java | Python

Half Diamond Star Pattern

C | Java | Python

Half Diamond Star Pattern Inverted

C | Java | Python

             *
            ***
           *****
          *******
           *****
            ***
             *

Diamond Star Pattern

C | Java | Python

Number Pattern Printing Programs

Basic Square 1 Pattern

Checkout code for this program –

C | Java | Python

Basic Square incrementing Pattern

Checkout code for this program –

C | Java | Python

Internal varsity square Pattern

Checkout code for this program –

C | Java | Python

Basic Right Triangle Number Pattern

Checkout code for this program –

C | Java | Python

Basic Right Triangle Number Pattern (Inverted)

Checkout code for this program –

C | Java | Python

Basic incrementing Triangle Pattern initialised = 3

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C | Java | Python

Basic incrementing Triangle Pattern(Inverted) initialised = 3 Checkout code for this program –

C | Java | Python

Basic double incrementing Triangle Pattern initialised = 3 Checkout code for this program –

C | Java | Python

Basic incrementing Diamond Pattern(Inverted) initialised = 3

Checkout code for this program –

C | Java | Python

Basic double incrementing Triangle Pattern initialised = 3

Checkout code for this program –

C | Java | Python

Basic incrementing Triangle Pattern(Inverted) initialised Mirrored = 3

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C | Java | Python

Basic incrementing Diamond Pattern(Inverted Sandwich) initialised = 3

Checkout code for this program –

C | Java | Python

Basic double incrementing Triangle Pattern initialised Sandwich= 3

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C | Java | Python

Basic incrementing Triangle Pattern(Inverted) initialised Mirrored Sandwich = 3

Checkout code for this program –

C | Java | Python

Number Star Mix Pattern

           1*2*3*4
           5*6*7*8
           9*10*11*12
           13*14*15*16

Basic incrementing Squared Number-Star Pattern

Checkout code for this program

C | Java | Python

           13*14*15*16
           9*10*11*12
           5*6*7*8
           1*2*3*4

Basic incrementing inverted Squared Number-Star Pattern

Checkout code for this program

C | Java | Python

          1*2*3*4
          9*10*11*12
          5*6*7*8
          13*14*15*16

Basic incrementing Squared Number-Star Pattern + Basic incrementing inverted Squared Number-Star Pattern (alternate)

Checkout code for this program

C | Java | Python

          1*2*3*4
          9*10*11*12
          13*14*15*16
          5*6*7*8

Basic incrementing Squared Number-Star Pattern + Basic incrementing inverted Squared Number-Star Pattern (alternate)

Type 2

Checkout code for this program

C | Java | Python

          1*2*3*4
          9*10*11*12
          17*18*19*20
          13*14*15*16
          5*6*7*8

Basic incrementing Squared Number-Star Pattern + Basic incrementing inverted Squared Number-Star Pattern (alternate)

Type 3

Checkout code for this program

C | Java | Python

          4*3*2*1
          12*11*10*9
          8*7*6*5
          16*15*14*13

Basic incrementing Squared Number-Star Pattern Mirrored + Basic incrementing inverted Squared Number-Star Pattern Mirrored (alternate)

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C | Java | Python

Basic incrementing Triangle Pattern

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C | Java | Python

Basic incrementing Triangle Pattern

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C | Java | Python

Basic incrementing Triangle Pattern + Inverted (Mix)

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C | Java | Python

Basic incrementing mirrored Triangle Pattern

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C | Java | Python

Basic incrementing inverted mirrored Triangle Pattern

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C | Java | Python

Basic incrementing Triangle Pattern + Inverted (Mix)

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C | Java | Python

Basic Diamond Number Star Pattern

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C | Java | Python

Basic Diamond Number Star Pattern (Sandwich)

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C | Java | Python

Basic Diamond Number Star Pattern (Sandwich Inverted)

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C | Java | Python

Basic Diamond Number Star Pattern initialised

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C | Java | Python

Basic Diamond Number Star Pattern (Sandwich)

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C | Java | Python

Basic Diamond Number Star Pattern (Sandwich Inverted)

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C | Java | Python