Read a string from user using gets () function. Now travel the string until a space (ASCII Code 32) found and copy the characters in a variable called 'word'. If a space found, then it considers a word and terminate it with a null character. Now reverse the word and store it into an output string. This procedure remains continue until the string is ended.

#include <stdio.h>
#include <string.h>
#include <conio.h>
int main()
{
	char str[30],rev[30],word[30],i,w=0;
	printf("Enter A String: ");
	gets(str);//READ A STRING
	strcat(str," ");//ADD A SPACE AT END OF STR
	strcpy(word,"");//BLANK THE TEMPORARY WORD 
	strcpy(rev,"");//BLANK THE OUTPUT STRING [REV]
	for(i=0;str[i]!='\0';i++)
	{
		if(str[i]!=' ')
		{
			//CHARACTER ATTACH TO WORD
			word[w++]=str[i];
		}
		else
		{
			word[w]='\0';
			strrev(word);//reverse the word
			//attach the reversed word into output string [rev]
			if(strlen(rev)==0)
			{
				strcpy(rev,word);
			}
			else
			{
				strcat(rev," ");
				strcat(rev,word);
			}
			//RESET THE VARIABLE WORD AND W
			strcpy(word,"");
			w=0;
		}
	}
	//PRINT THE OUTPUT
	printf("Result : ");
	puts(rev);
	return 0;
}