Thursday, December 18, 2014

Reverse the String using Recursion

#include

#include

#include

void reverse(char [], int, int);

int main()

    char str1[20];

    int size;

    clrscr();

    printf("Enter a string to reverse: ");

    scanf("%s", str1);

    size = strlen(str1);

    reverse(str1, 0, size - 1);

    printf("The string after reversing is: %s\n", str1);

    return 0;

void reverse(char str1[], int index, int size)

    char temp;

    temp = str1[index];

    str1[index] = str1[size - index];

    str1[size - index] = temp;

    if (index == size / 2)

        return;

    reverse(str1, index + 1, size);

Output

Enter a string to reverse: malayalam

The string after reversing is: malayalam

Enter a string to reverse: cprogramming

The string after reversing is: gnimmargorpc

Copy One String to another using Recursion

#include

#include

void copy(char [], char [], int);

int main()

    char str1[20], str2[20];

    clrscr();

    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

Enter string to copy: sanfoundry

Copying success.

The first string is: sanfoundry

The second string is: sanfoundry