# C Programming Code Examples

## C > Miscellaneous Code Examples

### C Program to Illustrate how User Authentication is Done

Code Generates All Possible Combinations -
Algorithm print all the 'possible combination' of each length from the given array. The time complexity of this algorithm is 'O(n*(2^n))'. A function to print all 'Combination of a Length'

C Reverse an Array without using another -
C reverse array without using another array relies on the above logic. What we need to do is maintain two array indexes. arrIndex that moves from size - 1 to 0. revIndex that moves

Program Computes the Area of a Triangle -
C++ Language code to compute the area of a triangle using determinants. The 'plus/minus' in this case is meant to take whichever sign is needed so the 'answer is positive'. Do not say

Access Elements of an Array Using Pointer -
Program Declares the array of five element & the elements of that array are accessed using pointer. The five elements are entered by the user and stored in the integer array data. And

Compare two Binary Files and Printing the -
C Compare two binary files, printing the first byte position where they differ. Compare two binary files character by character. Character by character comparision. If equal, continue

C++ Codes Finds Sum of Natural Numbers -
The "positive numbers" 1, 2, 3... are known as natural numbers. The program below takes a 'positive integer' from the user and calculates the sum up to the given number. You can find

Find GCD of the Numbers Using Recursion -
C Language program, use recursion, finds the GCD of the two numbers entered by the User. The user enters 2 numbers by using a space in between them or by pressing enter after each

C++ Programming Code Swap two Strings -
To swap two string in C++, enter the 2 strings, and store both the 'string' in variables say str1 & str2. To swap 2 strings, first make a variable say temp of the same type. 'Place the string1'