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C Programming Code Examples

C > Recursion Code Examples

C Program to Copy One String to Another using Recursion

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/* C Program to Copy One String to Another using Recursion This C Program uses recursive function & copies a string entered by user from one character array to another character array. */ #include <stdio.h> void copy(char [], char [], int); int main() { char string1[20], string2[20]; printf("Enter string to copy: "); scanf("%s", string1); copy(string1, string2, 0); printf("Copying success.\n"); printf("The first string is: %s\n", string1); printf("The second string is: %s\n", string2); return 0; } void copy(char string1[], char string2[], int index) { string2[index] = string1[index]; if (string1[index] == '\0') return; copy(string1, string2, index + 1); }

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.

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.

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.

#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:

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,

An array is defined as the collection of similar type of data items stored at contiguous memory locations. Arrays are the derived data type in C programming language which can store the primitive type of data such as int, char, double, float, etc. It also has the capability to store the collection of derived data types, such as pointers, structure, etc. The array is the simplest data structure where each data element can be randomly accessed by using its index number.

C Language program to Amstrong Numbers. Armstrong Number is a number which equal to the sum of the cubes of its individual digits For example, 407 is an armstrong number as

Instead of using Nested If Else. Lets combine 2 or more conditions together using Logical Operators. A number j1 among 3 numbers j1, j2 and j3 is said maximum if j1 > j2 and j1 > j3.



A 'Palindrome' is a special string which reads same from backward or forward such as eye, mom, madam, dad, bob, teet. We traverse a string character by character 'both direction'


C program 'Copy one String to another' string using loop. Input string from user and store it to some variable say "text1". Declare another variable to Store copy of first string in "text2".

Program implements doubly linked list using singly Linked List. It makes use of 2 pointers, one points at the current node, other points at the head and when user requests to move




Stores two floating point numbers in variable firstNumber and secondNumber respectively. Performs multiplication and stores the result in variable productOfTwoNumbers. Result up