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Program to Reverse the String using Both Recursion and Iteration

/* Program to Reverse the String using Both Recursion and Iteration */ #include <stdio.h> #include <string.h> /* Function Prototype */ void disp_str1_rec(char *); void main() { char str1[100], *ptr; int len1 = 0, i; char ch; printf("Enter the string:\n"); scanf("%[^\n]s", str1); ptr = str1; len1 = strlen(str1); printf("Using iteration:\n"); for (i = len1 - 1; i >= 0;i--) /* Iterative loop */ { ch = str1[i]; printf("%c", ch); } printf("Using recurssion:\n"); disp_str1_rec(ptr); } /* Code to reverse the string using Recursion */ void disp_str1_rec(char *stng) { char ch; if (*stng != '\0') { ch = *stng; stng++; disp_str1_rec(stng); printf("%c", ch); } else return; }

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,

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.

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:

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.

Get string length. Returns the length of the C string str. The length of a C string is determined by the terminating null-character: A C string is as long as the number of characters between the beginning of the string and the terminating null character (without including the terminating null character itself).

The for loop is used in the case where we need to execute some part of the code until the given condition is satisfied. The for loop is also called as a per-tested loop. It is better to use for loop if the number of iteration is known in advance. The for-loop statement is a very specialized while loop, which increases the readability of a program. It is frequently used to traverse the data structures like the array and linked list.

C Program 'counts the occurrences' of each C keyword by array structure. "C keywords" are the words which have a definition and cannot be used as an identifier. Continue, double, for

This C Program implements a Selection Sort. 'Selection Sort' works by finding the smallest unsorted item in the list and swapping it with the item in the current position. It is used for


Program to Fibonacci Series. Fibonacci Series generates subsequent number by adding two previous numbers and Fibonacci Series starts from 2 numbers F0 & F1. The initial values of

Highest position of a set bit from left to right in a number is said to be highest order set bit of that number. Highest order set bit of any negative integers is 31. Since, highest order...

C program code, 'using recursion', reverses a Stack content. Stack here is represented use a linked list. A Linked List is an ordered set of "Data Elements", each containing a link to its


Find all roots of a quadratic equation using if else. Input coefficients of quadratic equation from user. Store it in some variable say a, b, c. Find Discriminant of the an Equation, using...


C program find sum of all odd numbers from 1 to n using for loop. Input upper limit to find sum of odd numbers from user. Store it in a variable say N and initialize other variable to