12_reverse_word_wise.c

// // Write a function to reverse a string word wise. (For example if the given string is
// // “Programming is Love” then the resulting string should be “Love is Programming" )

// // Header Files
#include <stdio.h>
#include <conio.h>
#include <string.h>

#define ARRAY_SIZE 31

// // Function Declarations
int strLength(char[]);
char *strReverse(char[]);
char *strReverseWordWise(char[]);

// // Main Function Start
int main()
{
    char str[ARRAY_SIZE];

    printf("\nEnter Any String to Reverse it Word Wise (MAX CHARACTERS %d) => ", ARRAY_SIZE - 1);
    fgets(str, ARRAY_SIZE, stdin);  // // Input String
    str[strcspn(str, "\n")] = '\0'; // // Replace '\n' character with '\0' in str

    printf("\nString Before Reversing => %s", str);

    printf("\nString After Reversing => %s", strReverseWordWise(str));

    putch('\n');
    getch();
    return 0;
}
// // Main Function End

// // Function Definitions 👇👇

// // Function to Calculate Length of String
int strLength(char str[])
{
    int length = 0;

    while (str[length])
        length++;

    return length;
}

// // Function to Reverse a String
char *strReverse(char str[])
{
    int length = strLength(str);
    char temp;

    // // Reverse str
    int beg = 0, end = length - 1;
    while (beg < end)
    {
        // // Swap str[beg] with str[end]
        temp = str[beg];
        str[beg] = str[end];
        str[end] = temp;
        beg++;
        end--;
    }

    return str;
}

// // Function to Check Whether a Given String is Palindrome or Not
int isStrPalindrome(char str[])
{
    char copyStr[strLength(str) + 1]; // // create a string to copy str
    copyString(copyStr, str);         // // copy str into copyStr
    strReverse(copyStr);              // // reverse copyStr

    if (compareStrings(copyStr, str))
        return 0; // // String is not Palindrome

    return 1; // // String is Palindrome
}

// // Function to Reverse a String word wise
char *strReverseWordWise(char str[])
{
    strReverse(str); // // Reverse str

    int index = 0, lock = 1;

    for (int i = 0; str[i]; i++)
    {
        if (lock && str[i] != 32 && str[i] != '\t')
        {
            index = i;
            lock = 0;
        }
        else if (lock == 0 && (str[i] == 32 || str[i] == '\t' || str[i + 1] == '\0'))
        {
            int beg = index, end = str[i + 1] ? i - 1 : i;
            char temp;
            while (beg < end)
            {
                // // Swap str[beg] with str[end]
                temp = str[beg];
                str[beg] = str[end];
                str[end] = temp;
                beg++;
                end--;
            }

            lock = 1;
        }
    }

    return str;
}