C program to reverse the order of words in a String.

reverse_words.c

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

char *reverse(char str[]){
	static char result[100];
	int start, end, i, j=0;
	int len = strlen(str) - 1;
	start = end = i = len; //starting from the end of the string.
	while(i >= 0){
		if(str[i] == ' '){
			start = i + 1;
			while(start < end){
				result[j] = str[start++];
				j++;			
			}
			result[j] = ' ';
			start = end = i;
			j++;		
		}
		i--;
	}
	//adding the last word to the string.
	start = 0;
	while(start != end){
		result[j] = str[start];
		j++;
		start++;
	}
	return result;
}

int main(){
	char str[100];
	printf("Enter a string: ");
	fgets(str,100,stdin);	//fgets add a \n character at the end of the string by default
	printf("The reverse order string is: %s\n", reverse(str));
	return 0;
}