Reverse_Order_of_Words.c

#include <stdio.h>
#include <string.h>

#define MAX_SIZE 100 // Maximum string size

int main(){
	char str[100], reverse[100];
	int len, i, index, wordStart, wordEnd;

	printf("Enter a String : ");
	fgets(str, 100, stdin);

	len = strlen(str);
	index = 0;

	// Start checking of words from the end of string
	wordStart = len - 1;
	wordEnd = len - 1;

	while(wordStart > 0){
		// If a word is found
		if(str[wordStart] == ' '){
			// Add the word to the reverse string
			i = wordStart + 1;
			while(i <= wordEnd){
				reverse[index] = str[i];
				i++;
				index++;
			}
			reverse[index++] = ' ';
			wordEnd = wordStart - 1;
		}
		wordStart--;
	}

	// Finally add the last word
	for(i = 0; i <= wordEnd; i++){
		reverse[index] = str[i];
		index++;
	}

	// Add NULL character at the end of reverse string
	reverse[index] = '\0'; 

	printf("Original string \n%s\n\n", str);
	printf("Reversed Order of words \n%s", reverse);

	return 0;
}