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C > Recursion Code Examples

Program to Reverse the String using Recursion

Program to Reverse the String using Recursion

This C Program uses recursive function & reverses the string entered by user in the same memory location. Eg: "happycodings" will be reversed to "sgnidocyppah"

    #include <stdio.h>

    #include <string.h>

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

    int main()

    {

        char str1[20];

        int size;

        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);

    }

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