C Program to Copy One to Another String

Write a C Program to Copy One to Another String using Recursion. Here’s simple Program to Copy One to Another String using Recursion in C Programming Language.

Recursion : :

Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.

The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.

Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

Problem : :

This C Program uses recursive function & copies a string entered by user from one character array to another character array.

Here is the source code of the C program to copy string using recursion. The C Program is successfully compiled and run on a Windows system. The program output is also shown below.

SOURCE CODE : :

/*  C Program to Copy One to Another String using Recursion  */


#include <stdio.h>
 
void copy(char [], char [], int);
 
int main()
{
    char str1[20], str2[20];
 
    printf("Enter string to copy: ");
    scanf("%s", str1);
    copy(str1, str2, 0);
    printf("Copying success.\n");
    printf("The first string is: %s\n", str1);
    printf("The second string is: %s\n", str2);
    return 0;
}
 
void copy(char str1[], char str2[], int index)
{
    str2[index] = str1[index];
    if (str1[index] == '\0')
        return;
    copy(str1, str2, index + 1);
}

Output : :

*************** OUTPUT ******************


Enter string to copy: CodezClub

Copying success.

The first string is: CodezClub

The second string is: CodezClub

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