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C program to find GCD (HCF) of two numbers using recursion

/* C program to find GCD (HCF) of two numbers using recursion Write a recursive function in C to find GCD (HCF) of two numbers. How to find GCD(Greatest Common Divisor) or HCF(Highest Common Factor) of two numbers using recursion in C program. Here in this program we will be using recursive approach of Euclidean algorithm to find GCD of two numbers. The Euclidean algorithm to find GCD is, */ Algorithm to find GCD using Euclidean algorithm Begin: function gcd(a, b) If (b = 0) then return a End if Else return gcd(b, a mod b); End if End function End #include <stdio.h> /* Function declaration */ int gcd(int a, int b); int main() { int number1, number2, hcf; /* Input two numbers from user */ printf("Enter any two numbers to find GCD: "); scanf("%d%d", &number1, &number2); hcf = gcd(number1, number2); printf("GCD of %d and %d = %d", number1, number2, hcf); return 0; } /* Recursive approach of euclidean algorithm to find GCD of two numbers */ int gcd(int a, int b) { if(b == 0) return a; else return gcd(b, a%b); }

In C, the "main" function is treated the same as every function, it has a return type (and in some cases accepts inputs via parameters). The only difference is that the main function is "called" by the operating system when the user runs the program. Thus the main function is always the first code executed when a program starts. main() function is a user defined, body of the function is defined by the programmer or we can say main() is programmer/user implemented function, whose prototype is predefined in the compiler. Hence we can say that main() in c programming is user defined as well as predefined because it's prototype is predefined. main() is a system (compiler) declared function whose defined by the user, which is invoked automatically by the operating system when program is being executed.

A function is a group of statements that together perform a task. Every C program has at least one function, which is main(), and all the most trivial programs can define additional functions. You can divide up your code into separate functions. How you divide up your code among different functions is up to you, but logically the division is such that each function performs a specific task. A function declaration tells the compiler about a function's name, return type, and parameters. A function definition provides the actual body of the function. The C standard library provides numerous built-in functions that your program can call. For example, strcat() to concatenate two strings, memcpy() to copy one memory location to another location, and many more functions. A function can also be referred as a method or a sub-routine or a procedure, etc.

Writes the C string pointed by format to the standard output (stdout). If format includes format specifiers (subsequences beginning with %), the additional arguments following format are formatted and inserted in the resulting string replacing their respective specifiers. printf format string refers to a control parameter used by a class of functions in the input/output libraries of C programming language. The string is written in a simple template language: characters are usually copied literally into the function's output, but format specifiers, which start with a % character, indicate the location and method to translate a piece of data (such as a number) to characters. "printf" is the name of one of the main C output functions, and stands for "print formatted". printf format strings are complementary to scanf format strings, which provide formatted input (parsing). In both cases these provide simple functionality and fixed format compared to more sophisticated and flexible template engines or parsers,

Read formatted data from stdin. Reads data from stdin and stores them according to the parameter format into the locations pointed by the additional arguments. The additional arguments should point to already allocated objects of the type specified by their corresponding format specifier within the format string. In C programming, scanf() is one of the commonly used function to take input from the user. The scanf() function reads formatted input from the standard input such as keyboards. The scanf() function enables the programmer to accept formatted inputs to the application or production code. Moreover, by using this function, the users can provide dynamic input values to the application.

The if-else statement is used to perform two operations for a single condition. The if-else statement is an extension to the if statement using which, we can perform two different operations, i.e., one is for the correctness of that condition, and the other is for the incorrectness of the condition. Here, we must notice that if and else block cannot be executed simiulteneously. Using if-else statement is always preferable since it always invokes an otherwise case with every if condition.

#include is a way of including a standard or user-defined file in the program and is mostly written at the beginning of any C/C++ program. This directive is read by the preprocessor and orders it to insert the content of a user-defined or system header file into the following program. These files are mainly imported from an outside source into the current program. The process of importing such files that might be system-defined or user-defined is known as File Inclusion. This type of preprocessor directive tells the compiler to include a file in the source code program. Here are the two types of file that can be included using #include:






Go back to normal graphics mode or deleting viewport. Checking the egg position. Display mouse pointer. Define the upper left boundry of mouse. Define the bottom right boundry

When we pass the address of an array while calling a function then this is called function call by reference. When we pass an address as an argument, the function declaration...





In C program, we are going to accept a string. Program will check for word inside string and if word founds then program will reverse that word. Similarly it'll Reverse out all the Words.