C Program to Reverse Order of Words in a String

C program to reverse order of words in a string; Through this tutorial, we will learn how to reverse order of words in a string using for loop with if else, for loop with if in c programs.

Programs to Reverse Order of Words in a String in C

• C Program to Reverse Order of Words in a String using For Loop with If Else
• C Program to Reverse Order of Words in a String For Loop with If

C Program to Reverse Order of Words in a String using For Loop with If Else

/* C Program to Reverse Order of Words in a String */

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

int main()
{
  	char str[100];
  	int i, j, len, startIndex, endIndex;

  	printf("\n Please Enter any String :  ");
  	gets(str);

  	len = strlen(str);
  	endIndex = len - 1;

  	printf("\n *****  Given String in Reverse Order  ***** \n");
  	for(i = len - 1; i >= 0; i--)
	{
		if(str[i] == ' ' || i == 0)
		{
			if(i == 0)
			{
				startIndex = 0;
			}
			else
			{
				startIndex = i + 1;
			}
			for(j = startIndex; j <= endIndex; j++)
			{
				printf("%c", str[j]);
			}
			endIndex = i - 1;
			printf(" ");
		}
	}

  	return 0;
}

The output of the above c program; as follows:

Please Enter any String :  hello world
*****  Given String in Reverse Order  *****
world hello 

C Program to Reverse Order of Words in a String For Loop with If

/* C Program to Reverse Order of Words in a String */

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

int main()
{
  	char str[100];
  	int i, len;

  	printf("\n Please Enter any String :  ");
  	gets(str);

  	len = strlen(str);
  	printf("\n *****  Given String in Reverse Order  ***** \n");
  	for(i = len - 1; i >= 0; i--)
	{
		if(str[i] == ' ')
		{
			str[i] = '\0';
			printf("%s ", &(str[i]) + 1);
		}
	}
	printf("%s", str);

  	return 0;
}

The output of the above c program; as follows:

Please Enter any String :  c programming
*****  Given String in Reverse Order  *****
programming c

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