Question:- Write a C program to reverse the words in a sentence in place !

To reverse the words in sentence in place, lets we understand the pseudo-code of program with example of sentence like “This is firmcodes.com”, So our output would be “firmcodes.com is This”.

Pseudocode:

Step 1 : Reverse the individual words

“sihT si moc.sedocmrif “

Step 2 : Reverse the whole string

“firmcodes.com is This”

#include<stdio.h>

/* Driver Functions */ 
void ReverseString(char *s);
void ReverseWords(char *begin, char *end);
 
/* Main Method */ 
int main()
{
	char s[]="This is www.firmcodes.com";
	
	ReverseString(s);
	
	printf("%s",s);
	
	return 0;
}
 
/* Reverse the string */  
void ReverseString(char *s)
{
	char *start_word=s;
	char *traverse=s;
	
	/* Step 1 : Reverse the individual words */
	while(*traverse)
	{
		if( start_word &&  (*(traverse+1)==' ') || (*(traverse+1)=='\0'))
		{
			ReverseWords(start_word,traverse);
			start_word=traverse+2;
		}
		traverse++;
	}
	
	/* Step 2 : Reverse the whole string */
	ReverseWords(s,traverse-1);
}

/* Reverse individual words */ 
void ReverseWords(char *begin, char *end)
{
	char temp;
	
	while(begin<end)
	{
		temp=*begin;
		*begin++=*end;
		*end--=temp;
	}
}

Output

 

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